Converting from Gas to Electric Hot Water: What Wellington Homeowners Need to Know

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If your home uses gas for hot water, you may be wondering whether now is the time to switch to electric. With New Zealand’s natural gas supply declining, energy costs under pressure and uncertainty about future gas prices, more homeowners are considering alternatives.

The good news is that converting from gas hot water to electric hot water is often a straightforward process. Depending on your home, household size and hot water requirements, you could replace your existing gas system with an electric infinity water heater, a traditional electric hot water cylinder or a hot water heat pump.

At Plumb Plumbing, we help homeowners across Wellington, Porirua and Lower Hutt make the switch. In this guide, we’ll explain your options, what the conversion involves and how to choose the right system for your home.

Why Are More New Zealanders Switching from Gas to Electric Hot Water?

There are several reasons homeowners are looking at alternatives to gas hot water.

1. New Zealand’s natural gas supply is declining

New Zealand’s domestic natural gas production has fallen significantly in recent years, and major gas fields are reaching maturity. While gas is not disappearing overnight, the future of supply is uncertain.

Industry research has highlighted the potential for tighter supply and higher prices in the years ahead. This is prompting households to think about their long-term energy choices rather than simply replacing their existing gas appliances like for like.

2. Gas prices and daily connection charges add up

When comparing gas and electricity, it’s important to look beyond the cost of the energy you use.

If you have gas connected solely to heat your water, you may be paying a daily gas connection charge as well as the cost of the gas itself. These fixed charges continue even when your household uses relatively little hot water.

Switching to electric hot water and disconnecting your gas supply altogether could eliminate those gas connection charges. The potential savings depend on your current gas and electricity plans, hot water usage and the cost of installing your new system.

3. It’s an opportunity to choose a more efficient system

Modern electric hot water systems offer several options to suit different homes and budgets.

A standard electric hot water cylinder is often the simplest replacement, while a hot water heat pump can use considerably less electricity than a conventional electric cylinder. Electric infinity systems are another option for households that prefer heating water on demand.

Choosing the right system now can help you manage ongoing energy costs and reduce your reliance on natural gas.

What Are Your Options for Replacing Gas Hot Water?

There isn’t one solution that suits every home. Here are the three main options to consider when converting from gas to electric hot water.

Option 1: Electric infinity hot water

If your current system is a gas infinity water heater, you may be interested in replacing it with an electric infinity system.

An infinity system heats water as it flows through the unit rather than storing hot water in a cylinder. This means you don’t need a large storage tank, and you can continue using hot water on demand.

However, electric infinity systems have different electrical requirements from gas systems. They can require a substantial electrical supply, and the suitability of your existing switchboard and wiring needs to be assessed before installation.

Best suited to: Homes where space is limited and an appropriately sized electrical supply is available.

Option 2: A standard electric hot water cylinder

A traditional electric hot water cylinder stores heated water ready for use. It is a popular option for households switching away from gas because it is a well-established technology with a relatively straightforward installation in many homes.

Cylinders are available in different sizes, including options suitable for larger households. Depending on your property, the cylinder can be installed indoors or in an outdoor location.

One advantage of a storage cylinder is that it can provide a strong supply of hot water to multiple outlets, provided the system is correctly sized and configured.

When selecting a cylinder, we’ll consider the number of people in your household, your usual hot water usage, available space and the existing plumbing.

Best suited to: Households wanting a practical, familiar and generally lower-upfront-cost electric hot water solution.

Option 3: A hot water heat pump

A hot water heat pump uses heat from the surrounding air to heat water, rather than relying solely on conventional electric resistance heating.

This makes it significantly more energy-efficient than a standard electric hot water cylinder. Although the initial purchase and installation cost is generally higher, the reduced electricity consumption can make a heat pump an attractive option over the longer term.

The best system will depend on your household’s hot water demand, installation space, budget and the suitability of the location.

Best suited to: Homeowners who want to reduce electricity consumption and are prepared to invest more upfront to potentially save on running costs.

Which Electric Hot Water System Is Best for Your Home?

Here’s a quick comparison of the main options.

Feature Electric infinity Electric cylinder Hot water heat pump
Stores hot water No Yes Yes
Upfront cost Depends on electrical work and system Generally lower Generally higher
Running costs Depends on usage and electricity tariff Generally higher than a heat pump Generally lowest of the three
Space requirements Compact unit Requires cylinder space Requires space for the system and airflow
Electrical considerations Can require a substantial supply Usually more straightforward Depends on the model and installation

The right choice depends on more than the appliance price alone. Electrical upgrades, plumbing alterations, available space and the cost of disconnecting gas can all affect the total installation cost.

It’s worth comparing both the upfront investment and expected running costs before deciding.

How Much Does It Cost to Convert from Gas to Electric Hot Water?

The cost of converting from gas to electric hot water varies from one property to another.

The main factors affecting the price include:

  • Your new hot water system: The cost will depend on whether you choose an electric infinity unit, a standard cylinder or a heat pump.
  • Electrical work: Your home may need a new dedicated power supply, additional wiring or switchboard upgrades.
  • Plumbing alterations: Pipework may need to be modified to suit the new system or its location.
  • Installation location: Installing a cylinder indoors, outdoors or in a different part of the property can affect labour and materials.
  • Gas disconnection: If you’re removing your last gas appliance, you may also need to arrange permanent disconnection of your gas supply.

A standard electric cylinder will generally have a lower upfront cost than a hot water heat pump, but the heat pump may offer lower running costs over time.

For a meaningful comparison, it’s best to get a quote based on your actual property and requirements rather than relying on a generic price.

At Plumb Plumbing, we can assess your existing system, discuss suitable alternatives and explain the work involved before you commit.

What Is Involved in Converting from Gas Hot Water to Electric?

Many gas-to-electric hot water conversions can be completed within a day, although the timeframe depends on the property and the work required.

Here’s how the process typically works.

Step 1: Assess your existing system and household needs

First, we’ll look at your current gas hot water system, your home’s plumbing and electrical setup, the available installation locations and your household’s hot water requirements.

We’ll discuss the different options and help you choose a system that makes sense for your home.

Step 2: Arrange the necessary electrical work

An electric hot water system needs a suitable electrical supply. Depending on the system and your existing installation, additional wiring or other electrical work may be required.

We coordinate with a licensed electrician to ensure the electrical requirements are addressed as part of the conversion.

Step 3: Disconnect and remove the gas hot water system

Your existing gas water heater will be safely disconnected and removed.

If you still use gas for cooking, heating or another appliance, the supply can generally be isolated to the hot water system while your other appliances remain connected.

If hot water is your last remaining use of gas, you’ll need to arrange the appropriate gas disconnection and any necessary work to permanently disconnect the property from the gas network. We can help coordinate this process.

Step 4: Install your new electric hot water system

Your new system will be installed and connected to the appropriate plumbing and electrical services. Any required changes to pipework, valves and fittings will be completed as part of the job.

Step 5: Test the system and check everything is working

Before the job is complete, we’ll check the installation and test the system to ensure it is operating correctly and safely.

We also arrange disposal of the old equipment as part of our service.

Our aim is to make the changeover as straightforward as possible, with minimal disruption to your household.

Can You Switch from Gas Infinity to an Electric Hot Water Cylinder?

Yes. You don’t have to replace your gas infinity system with another infinity system.

In fact, switching from gas infinity to an electric hot water cylinder is a common conversion option worth considering.

The main difference is that a cylinder stores hot water, whereas an infinity system heats water as it is needed. This means you’ll need to consider where the cylinder could go and what size would suit your household.

An outdoor cylinder may be a practical solution if you don’t have enough room inside your home.

We’ll assess the available space, plumbing layout and hot water requirements to help determine whether this option is suitable.

Should You Disconnect Your Gas Supply Completely?

If you use gas only for hot water, switching to electric may allow you to eliminate your gas connection altogether.

This can be particularly worthwhile because you may no longer need to pay daily gas connection charges.

However, if your home also uses gas for cooking or space heating, you’ll need to decide whether to keep those appliances or transition them to electric alternatives as well.

If you decide to remove your final gas appliance, the gas supply must be disconnected through the appropriate provider and qualified professionals. Simply removing the hot water unit does not necessarily end your gas account or connection charges.

We’ll explain the options for your situation so you can make an informed decision.

Is Now a Good Time to Switch from Gas to Electric Hot Water?

For many households, it’s worth investigating the switch now rather than waiting for their gas hot water system to fail.

New Zealand’s changing gas supply outlook makes future costs uncertain, and replacing a failing appliance gives you an opportunity to consider alternatives before you’re forced to make a quick decision.

If your current gas water heater is nearing the end of its life, planning ahead can give you time to compare systems, understand the installation requirements and budget for the conversion.

You don’t necessarily need to change everything in your home at once. You can start by replacing your gas hot water system and consider other appliances separately.

The best approach is to compare the full cost of each option, including installation, ongoing energy use and any gas charges you could avoid.

Convert from Gas to Electric Hot Water with Plumb Plumbing

If you’re considering converting from gas hot water to electric, Plumb Plumbing can help you understand your options and organise the changeover.

We provide gas-to-electric hot water conversions for residential customers across Wellington, Porirua and Lower Hutt.

With more than 25 years of experience, we can assess your existing setup, explain the pros and cons of different systems and coordinate the plumbing, electrical and gas disconnection work required.

In many cases, the conversion can be completed within a day. We’ll confirm the likely timeframe and requirements for your property before the work begins.

We regularly work with our trusted gasfitters and electricians and can arrange their services as part of your conversion. Alternatively, you’re welcome to use your own preferred tradespeople. We’ll work with you to make the changeover as straightforward as possible.

Ready to find out what switching from gas to electric hot water would involve at your home?

Call Craig on 027 310 9399 to discuss your options or arrange an assessment or send us a message through our contact form.

Plumb Plumbing — experienced plumbing services across Wellington, Porirua and Lower Hutt.

Further information

For more information about New Zealand’s changing gas market and hot water options, see:

 

This article provides general information. System suitability, installation costs and potential savings depend on the individual property and household.

How 10mm Hot Water Pipes Can Help Reduce Your Water and Power Bills

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Do you find yourself standing around waiting for the shower or tap to get hot?

You might not think much of the few seconds it takes for hot water to arrive, but if you have a long run of hot water pipe, litres of water can go straight down the drain every time you turn on the tap.

And that wasted water isn’t the only issue. The water sitting in your hot water pipes cools down between uses, so every time you turn on the tap, your hot water system has to heat more water before you get the hot water you’re actually waiting for.

If you’re looking for ways to save money on your electricity bill and reduce hot water waste, the size and layout of your hot water pipes are worth considering.

Why does hot water take so long to arrive?

Traditional plumbing systems often use larger hot water pipes, such as 15mm or 20mm, with one main pipe branching off to several taps and appliances.

The problem is that a larger pipe contains more water.

For example, a 20mm diameter pipe holds approximately four times as much water per metre as a 10mm diameter pipe, assuming the same internal diameter. So if you have several metres of larger pipe between your hot water cylinder and a tap, there can be a surprising amount of water sitting in the pipe waiting to be used.

That water cools between uses.

When you turn on the tap, the cooled water has to leave the pipe before the fresh hot water from the cylinder reaches you.

This is sometimes referred to as dead water or dead-leg water.

How can 10mm hot water pipe help?

Using appropriately sized 10mm hot water pipe can significantly reduce the volume of water sitting in the pipe between uses.

Less water in the pipe means:

  • Less cold water wasted while you’re waiting for hot water
  • Hot water reaches the tap sooner
  • Less cooled water needs to be reheated
  • Less heat is lost from water sitting in the pipe
  • Less water is sent down the drain

For households that use a particular bathroom or kitchen tap frequently, these small savings can add up over time.

It is not simply the diameter of the pipe that matters, however. The length and layout of the pipework are also important.

The plumbing layout matters too

Imagine you have one hot water pipe running through your house, with several tee-offs supplying different taps.

The hot water might have to travel several metres along the main pipe before it reaches your bathroom. Every time you use that bathroom tap, all the cooled water sitting in that section of pipe has to be displaced first.

A more efficient approach is to design the system so that individual outlets have shorter, appropriately sized runs of hot water pipe.

This can be particularly effective in a new build or during a renovation, when pipework is accessible and the hot water system can be designed around the layout of the house.

Can existing hot water pipes be replaced with 10mm pipe?

Sometimes, yes.

If your existing hot water pipes are accessible in the ceiling, under the floor or through other accessible areas, a plumber may be able to replace larger sections of pipe with smaller-diameter pipe.

Renovations can provide a particularly good opportunity to do this because walls and ceilings may already be open.

However, 10mm pipe isn’t suitable for every situation. Hot water pipework needs to be correctly sized for the length of the run, water pressure, flow requirements and the fixtures being supplied. A smaller pipe can reduce the volume of water sitting in the pipe, but it also has less capacity to deliver water.

Your plumber should therefore assess the whole system rather than simply replacing every hot water pipe with 10mm pipe.

New Zealand’s Building Code requires water supply pipework to be appropriately sized and suitable for the temperatures and pressures of the system.

Don’t forget to insulate your hot water pipes

If you’re replacing hot water pipework, pipe insulation (lagging) is another simple way to improve efficiency.

Insulating hot water pipes helps slow down heat loss while hot water is sitting in the pipe. This is particularly useful for longer pipe runs and pipework passing through colder areas such as ceilings, under floors or garages.

New Zealand’s Building Code includes energy-efficiency requirements for hot water systems, and hot water pipe insulation forms part of the overall approach to reducing heat loss.

What about water pressure?

You may have heard that smaller hot water pipes can reduce water pressure.

This is why pipe sizing needs to be considered as part of the overall plumbing design. Mains-pressure systems can be suitable for smaller-diameter hot water pipework in the right circumstances, but the length of the pipe run, available pressure, number of outlets and expected flow all need to be taken into account.

We wouldn’t recommend changing your hot water pipe size without having a plumber assess your particular system first.

Is 10mm hot water pipe worth considering?

If you’re building a new home, renovating, or already have a long wait for hot water at certain taps, it’s worth asking your plumber about 10mm hot water pipe and a more efficient hot water pipe layout.

The biggest benefits are likely to come from reducing unnecessarily long pipe runs and reducing the amount of water sitting in the pipe between the hot water cylinder and the outlet.

And if your goal is to reduce hot water waste and save money on your electricity bill, it’s worth looking at the whole hot water system—not just the cylinder itself.

A well-designed system can help you get hot water to the tap faster, waste less water while you’re waiting, and reduce heat loss from your hot water pipework.

Want to reduce hot water waste in your home?

If you’re in Wellington and would like to know whether your existing hot water pipework could be improved, contact us, Plumb Plumbing and Drainage.

We can assess your existing hot water pipe layout and let you know whether replacing accessible pipework with appropriately sized 10mm hot water pipe could be worthwhile for your home.

If you’re renovating or building, it’s even easier to incorporate an efficient hot water pipe layout from the beginning.

Is high water pressure damaging your home?

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Most homeowners never think about their home’s water pressure. In fact, many people assume that stronger water pressure is always better.

Unfortunately, water pressure that’s too high can quietly cause thousands of dollars’ worth of damage before you even realise there’s a problem.

What Problems Can High Water Pressure Cause?

Excessively high water pressure places constant strain on your home’s plumbing system. Over time, this can lead to:

  • Burst or leaking pipes
  • Damaged taps and mixers
  • Leaking showerheads
  • Premature failure of hot water cylinders
  • Shortened lifespan of appliances such as dishwashers and washing machines
  • More frequent plumbing repairs

A burst pipe can cause significant water damage in a very short time, often affecting flooring, walls, insulation and even electrical systems.

Have You Recently Renovated?

If you’ve recently installed a new kitchen, bathroom or laundry, checking your water pressure is particularly important.

Many manufacturers specify a maximum operating pressure for their products. If your home’s water pressure exceeds that limit, the warranty on mixers, tapware and some other plumbing fixtures may be void.

A simple pressure check now could save you from expensive repairs and warranty issues later.

How Do I Know If My Water Pressure Is Too High?

High water pressure isn’t always obvious, but some common signs include:

  • Taps that spray forcefully when turned on
  • Pipes banging or making noise (water hammer)
  • Frequent dripping taps
  • Repeated plumbing leaks
  • Fixtures or appliances that seem to fail earlier than expected

The only way to know for certain is to have your water pressure professionally tested.

We Can Check Your Water Pressure

Craig can quickly check your home’s water pressure using an outdoor hose tap, so in many cases there’s no need for anyone to be home or to provide access inside the house.

If your water pressure is higher than recommended, he’ll provide an obligation-free quote to install a pressure-limiting valve with an integrated filter. This protects your entire plumbing system by reducing the pressure to a safe operating level while also helping to filter debris from the water supply.

Already booking us for another plumbing job? Just ask Craig to check your water pressure while he’s there.

Will Lowering My Water Pressure Make My Shower Worse?

This is one of the most common questions we hear.

The good news is that reducing excessively high water pressure to the correct working pressure usually makes little noticeable difference to your shower or taps. Most homeowners continue to enjoy excellent water flow while gaining the peace of mind that their plumbing system is protected from unnecessary wear and tear.

Protect Your Plumbing Before Problems Start

High water pressure is one of those hidden plumbing issues that’s easy to ignore—until something fails. A simple pressure check can help protect your pipes, fixtures and appliances, potentially saving you thousands in future repair costs.

If you live in Wellington and would like your home’s water pressure checked, contact Plumb Plumbing & Drainage. We’d be happy to help.

How to Save Money on Your Winter Power Bills by Improving Your Hot Water System

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Winter in Wellington often brings a nasty surprise: higher power bills.

As temperatures drop, we spend more time indoors, take longer hot showers, run extra loads of washing, and rely more heavily on heating. While many homeowners focus on reducing heating costs, they often overlook one of the biggest contributors to their electricity bill: hot water.

In fact, water heating typically accounts for around 30% of a household’s energy use. Improving the efficiency of your hot water system can significantly reduce your winter power bills without sacrificing comfort.

Why Is Hot Water So Expensive?

Every time you turn on a hot tap, your hot water cylinder or water heating system has to replace that heated water. During winter, incoming water is colder, meaning your system works harder and uses more electricity to reach the desired temperature.

The good news is that there are several ways to improve the efficiency of your hot water system and reduce ongoing energy costs.

How to Reduce Power Bills

Insulate Hot Water Pipes

Many homes lose heat through exposed hot water pipes, especially underneath older houses or in ceiling spaces.

Installing pipe insulation (also known as lagging) helps keep water hotter for longer as it travels through your home. This means less energy is needed to maintain water temperature and less waiting time at the tap.

Pipe insulation is one of the simplest and most cost-effective ways to improve hot water efficiency.

Install Water-Saving Showerheads and Flow Restrictors

Hot showers are one of the largest users of hot water in most homes.

Modern low-flow showerheads and flow restrictors reduce water usage while still providing a comfortable shower experience. Because less hot water is being used, your hot water cylinder doesn’t need to work as hard, resulting in lower electricity consumption.

These small upgrades can make a noticeable difference to your power bill over the course of winter.

Check Your Hot Water Cylinder Temperature

Many hot water cylinders are set higher than necessary.

A plumber can check the thermostat and tempering valve settings to ensure your system is operating safely and efficiently. If the temperature is set too high, you’re paying to heat water beyond what your household actually needs.

Finding the right balance can help reduce energy consumption while maintaining safe hot water temperatures.

Upgrade Old Pipework

Older plumbing systems often use larger shared hot water pipes that contain a significant volume of water.

Modern plumbing designs typically use smaller dedicated pipe runs to each fixture. Because there’s less water sitting in the pipes, hot water reaches taps and showers faster, reducing water wastage and energy loss.

If you’re renovating, replacing damaged pipework, or undertaking other plumbing upgrades, it may be worth discussing whether your hot water pipe layout could be improved.

Consider a Hot Water Heat Pump

If your hot water cylinder is older or nearing the end of its life, a hot water heat pump could provide substantial long-term savings.

Unlike traditional electric cylinders that generate heat directly, hot water heat pumps extract heat from the surrounding air and transfer it into the water. This process uses significantly less electricity.

Many households can reduce their water heating costs by up to 60–70% after switching to a hot water heat pump, depending on their usage patterns and existing system.

In some cases, your existing hot water cylinder may be compatible with a heat pump upgrade.

Find out more about heat pump hot water cylinders here.

Check for Hidden Leaks

Even small leaks from hot water pipes, valves, or cylinders can waste both water and energy.

A dripping hot tap or leaking hot water relief valve may not seem significant, but over time these issues can increase your water heating costs.

A plumbing inspection can identify leaks before they become expensive problems.

Signs Your Hot Water System May Be Costing You Money on Your Power Bills

You may benefit from an efficiency assessment if:

  • Your power bills seem unusually high during winter.
  • Your hot water cylinder is more than 10–15 years old.
  • You frequently run out of hot water.
  • It takes a long time for hot water to reach taps.
  • You have exposed hot water pipes.
  • Your household has grown and your hot water usage has changed.
  • You’re planning renovations or plumbing upgrades.

Want Lower Winter Power Bills?

Many homeowners assume the only way to reduce power costs is to use their heaters less. In reality, improving your hot water system can be one of the most effective ways to lower household energy use.

Whether it’s pipe insulation, flow restrictors, hot water cylinder optimisation, leak repairs, or advice on heat pump hot water systems, we can help you identify the improvements that will deliver the best value for your home and budget.

Book a Hot Water Efficiency Check & Save on Your Power Bills

If you’d like practical advice on reducing your winter power bills, Craig can assess your existing hot water system and recommend improvements that fit your home and budget.

Contact us today and start saving on your winter power bills.

Heat Pump Hot Water Cylinders: Everything New Zealand Homeowners Need to Know

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Lower power bills, greener living, reliable hot water — here’s your complete guide to heat pump hot water cylinders for 2026.

Hot water heating accounts for roughly a third of the average New Zealand household’s energy bill. A heat pump hot water cylinder is one of the smartest upgrades you can make — slashing running costs while dramatically reducing your carbon footprint. In this guide we answer the questions we hear most often, explain the requirements for installation, and show you why the Rinnai HydraHeat is the model we most commonly recommend.

What Is a Heat Pump Hot Water Cylinder?

A heat pump hot water cylinder combines a standard storage cylinder with heat pump technology to heat your water far more efficiently than a conventional electric element alone. Instead of generating heat directly from electricity, it works a bit like a refrigerator in reverse — drawing warmth from the surrounding air and transferring that energy into the water stored in your cylinder.

Because it’s moving heat rather than creating it, the system can produce three to five units of heat energy for every one unit of electrical energy it consumes. That efficiency ratio is called the coefficient of performance (COP), and it’s the reason these systems can cut water heating costs by up to 75% compared to a standard electric cylinder.

Key Benefits of a Heat Pump Hot Water Cylinder in NZ

Major savings on power bills

Up to 75% reduction in water heating costs compared to a standard electric cylinder — one of the fastest-payback home upgrades available.

Lower carbon footprint

Uses significantly less electricity and runs on refrigerants with low global warming potential — a genuine step toward a greener home.

Reliable hot water supply

Storage cylinders keep a large volume of hot water ready at all times, with a backup electric element for high-demand periods.

Works in cold NZ winters

Quality models like the Rinnai HydraHeat operate in full heat pump mode down to −10°C, making them suitable across all New Zealand climates.

Adds value to your home

Energy-efficient upgrades are increasingly valued by buyers and can contribute to a better home energy rating.

Generous warranties

Leading brands back their units with multi-year warranties — the Rinnai HydraHeat carries a 5-year heat pump unit warranty and a 7-year cylinder warranty.

 

The Rinnai HydraHeat: Our Most-Requested Heat Pump Hot Water Cylinder Model

We install heat pump hot water systems from several manufacturers, but the model generating the most enquiries right now is the Rinnai HydraHeat. Here’s why it stands out for New Zealand homes.

Rinnai HydraHeat® — Designed & Built in New Zealand

Rinnai has engineered the HydraHeat specifically for Kiwi climates and coastal environments, using a high-efficiency R290 refrigerant with low global warming potential. It’s one of the few models that operates in full heat pump mode all the way down to −10°C without needing the electric element to kick in.

75% Max savings vs standard electric cylinder
4.7 COP (coefficient of performance)
−10°C Full heat pump mode down to
45 dB Quiet operation (measured at 1 m)
275L & 340L Available in two sizes – 275L (2–5 people) and 340L (2–7 people)
MEPSNZ Minimum Energy Performance Standard compliant

Two configurations to choose from

HydraHeat Integrated: The heat pump unit sits directly on top of the cylinder as a single self-contained system. This is the most common choice for new installations or full replacements. Available in 275L and 340L capacities.
HydraHeat Split: The heat pump unit connects to a separate cylinder via a refrigerant line, which allows more flexible placement — particularly useful where space is tight or the cylinder is located indoors. It’s also compatible with qualifying existing cylinders, which can reduce the cost of upgrading.

Smart controls and six operating modes

The HydraHeat features an OLED control panel and six operating modes including Eco, Standard, Boost, and an Away mode for when you’re on holiday. You can schedule heating to run overnight on a low-rate power tariff, which is a simple way to maximise your savings further.

Modular and future-proof design

If you’re not quite ready to commit to the full heat pump system, Rinnai offers a Heat Pump Ready cylinder — a standard electric cylinder that can be upgraded later by simply adding the HydraHeat head unit, with no need to replace the cylinder itself.

Installation Requirements for Heat Pump Hot Water Cylinders in NZ

Before getting a heat pump hot water cylinder installed, there are a few practical requirements to be aware of. Our team at Plumb will assess all of these during a site visit, but here’s a useful overview.

You’ll need licensed tradespeople

In New Zealand, the installation of a heat pump hot water system requires both a licensed plumber (for water connections and compliance certification) and a licensed electrician (for all wiring). Some split systems also require a tradesperson with an Approved Filler Compliance Certificate for handling refrigerants. Our team works with trusted, fully qualified electricians to manage your complete installation.

  • Licensed plumber — required for all water connections, drainage, and to issue the compliance certificate
  • Licensed electrician — required for all electrical wiring under AS/NZS 3000
  • Suitable outdoor location — most heat pump cylinders are designed primarily for outdoor installation, requiring a flat, stable, well-supported base with good airflow
  • Adequate clearances — the unit needs sufficient space around it for air intake and exhaust, and must meet boundary setback requirements
  • Tempering valve — required under updated NZ building code (G12/AS1, November 2024) for all new or replacement installations, to limit hot water at personal hygiene taps to 50°C
  • Water quality — hard or acidic water may need treatment before installation; your plumber can advise
2024 Building Code Update: From 1 November 2024, all new or replacement hot water cylinder installations in NZ must include a tempering valve that limits water temperature at bathroom and shower taps to no more than 50°C. The storage cylinder itself must still maintain at least 60°C to prevent bacterial growth. Plumb ensures all our installations are fully compliant with the current code.

What size cylinder do I need?

Getting the right capacity is important — too small and you’ll run out of hot water; too large and you’ll be heating more water than you need. As a general guide:

  • 275 litres — suitable for households of 2–5 people
  • 340 litres — suitable for households of 2–7 people

Our team will assess your household’s usage patterns and recommend the right size during a no-obligation site assessment.

How Much Does a Heat Pump Hot Water Cylinder Cost in NZ?

The total cost of a heat pump hot water cylinder installation in New Zealand varies depending on the model chosen, your cylinder size, your existing setup, and how complex the install is. Our plumber will will run through the options suitable for your particular situation with you and provide a clear quote before work begins.

Can I get financial assistance?

Yes. The Rinnai HydraHeat is eligible for an NZ Green Energy Loan, which can help spread the upfront cost. Some power companies also offer rebates or interest-free finance for energy-efficiency upgrades, so it’s worth checking with your electricity provider as well. The long-term savings on your power bill mean most installations pay for themselves within a handful of years.

Heat Pump Hot Water vs Solar Hot Water: Which Is Better for NZ?

This is a common question. Both systems are greener than a standard electric cylinder, but they suit different situations:

Heat pump cylinders work regardless of sunlight, making them reliable year-round — including Wellington winters and South Island climates. They don’t require roof panels or a north-facing roof. Installation is generally simpler and lower-cost. They’re our most recommended choice for the majority of NZ homes.

Solar hot water systems can be very effective in sunny regions and have very low running costs when the sun is shining. However, they typically have higher upfront installation costs, depend on roof orientation and shading, and usually still require a backup element for cloudy periods or high-demand days.

For most New Zealand households, a heat pump cylinder delivers the best balance of cost, reliability, and energy savings — particularly given NZ’s variable weather.

Frequently Asked Questions

How much will I save on my power bill?

Up to 75% on your water heating costs compared to a standard electric cylinder. Hot water heating typically makes up around 25–35% of a household’s power bill, so the overall saving on your total bill is significant. The exact amount depends on your household’s usage, your power tariff, and how you schedule the unit to run.

Will it work in cold New Zealand winters?

Yes. The Rinnai HydraHeat is specifically engineered for New Zealand conditions and operates in full heat pump mode down to −10°C, with built-in frost protection and defrost functions. It’s been tested to handle coastal environments as well.

How noisy are heat pump hot water cylinders?

The HydraHeat operates at around 45 dB(A) at one metre — roughly the level of a quiet conversation or a refrigerator hum. It’s quiet enough for most residential settings including built-up areas. Placement away from bedroom windows is recommended as good practice.

Do I need a building consent to install one?

In most cases, replacing a like-for-like cylinder on an existing connection does not require a building consent. However, a Licensed Building Practitioner (LBP) sign-off and compliance certificate is required for all plumbing and drainage work. Your Plumb plumber will handle all the required compliance paperwork.

Can a heat pump cylinder be installed indoors?

The Rinnai HydraHeat is primarily designed for outdoor installation. It may be possible to install it in an unoccupied indoor space (such as a garage or utility room) with adequate ventilation, but this should be assessed by a qualified installer before proceeding. Outdoor installation is simpler and more common.

How long does installation take?

A standard installation typically takes half a day to a full day, depending on the complexity of your existing setup, site preparation required, and whether electrical upgrades are needed. Our team will give you a clear timeframe when we quote the job.

What warranty does the Rinnai HydraHeat come with?

The HydraHeat comes with a 5-year warranty on the heat pump unit and a 7-year warranty on the cylinder — strong coverage that reflects the quality of the product. Warranties apply when installed by a qualified tradesperson in accordance with Rinnai’s installation guidelines.

What happens if the heat pump part breaks down?

One of the smart design features of the HydraHeat is its modular, removable heat pump unit. If the heat pump component requires servicing, it can be removed without interrupting your hot water supply — the inbuilt electric element keeps the cylinder operational in the meantime.

Is my existing cylinder compatible with a heat pump upgrade?

Possibly. The HydraHeat Split is compatible with qualifying cylinders: a single-element mains pressure cylinder, 180–340L, with an element size of 3kW or less, manufactured by Rinnai, HJ Cooper, or Rheem, and no more than 8 years old. It also must not be connected to supplementary heating like a wetback or solar thermal system. Our team can assess your current setup and advise whether an upgrade or a full replacement is the better path.

Ready to cut your power bill?

Our Wellington-based team installs heat pump hot water cylinders across the region. Contact us today for professional advice or a free, no-obligation quote.

Blocked Drains? Signs, Causes & How to Get Your Drain Cleared Fast

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When you have a blocked drain, it rarely happens out of nowhere. Most drain issues build up over time — until suddenly water stops flowing and you need urgent help.

If you’re searching for drain clearing, unblocking a drain, or an emergency plumber, here’s what you need to know.

Common Signs of a Blocked Drain

Catching a blockage early can save you time, stress, and money. Look out for these warning signs:

  • Water draining slowly from sinks, showers, or baths
  • Toilet water rising higher than normal after flushing
  • Gurgling noises coming from pipes or drains
  • Unpleasant smells coming from plugholes or outside drains
  • Outdoor gully trap overflowing or sitting full of water

If you notice any of these, your drain likely needs professional attention.

What Happens If You Don’t Clear a Blocked Drain?

Delaying drain unblocking can turn a minor issue into a costly repair.

Left untreated, blocked drains can lead to:

  • Sewage backups into your home
  • Foul odours caused by trapped waste and bacteria
  • Health risks from contaminated water
  • Leaks and flooding that damage floors, walls, and foundations
  • Higher repair costs if pipes crack or collapse

In short: the earlier you act, the simpler and cheaper the fix.

What Causes Blocked Drains?

Most blocked drains come down to a few common issues:

1. Build-Up of Waste and Debris

Over time, everyday materials accumulate inside pipes:

  • Grease and cooking oils
  • Soap residue and hair
  • Toilet paper and sanitary products
  • Food scraps

This gradually restricts water flow until a blockage forms.

2. Tree Root Intrusion

Tree roots are a major cause of blocked drains in New Zealand properties.
They can:

  • Enter pipes through small cracks or joints
  • Expand inside the pipe
  • Completely block water flow

3. Damaged or Collapsed Pipes

Older or damaged pipes may:

  • Crack
  • Shift
  • Collapse

This not only causes blockages but may require repair or replacement.

How Professional Drain Clearing Works

When you call a plumber for blocked drain repair, the process is typically:

Step 1: Initial Assessment

A plumber checks the symptoms and may attempt to clear the blockage using manual tools for a quick, cost-effective solution.

Step 2: CCTV Drain Inspection

If the blockage is stubborn, a drain camera may be used to:

  • Identify the exact cause
  • Locate the blockage
  • Assess pipe condition

Step 3: High-Pressure Water Jetting

For tougher blockages, high-pressure jetting is used to:

  • Cut through tree roots
  • Flush out grease and debris
  • Fully clear the pipe

Step 4: Repair and Clean-Up

If damage is found, repairs can be carried out. The area is then cleaned and disinfected to ensure hygiene.

Can You Clear a Blocked Drain Yourself?

For minor issues, you can try:

  • Boiling water (for grease build-up)
  • A plunger
  • Basic drain cleaners

However, if the problem persists, it’s best to call a professional. DIY attempts often only provide temporary relief and can sometimes worsen the blockage.

How to Prevent Blocked Drains

Reduce the risk of future blockages with a few simple habits:

  • Avoid pouring fats, oils, and grease down the sink
  • Use drain strainers to catch hair and debris
  • Only flush toilet paper (no wipes or sanitary items)
  • Schedule regular drain inspections if your property has trees nearby

Need Your Drain Cleared? Act Early

Blocked drains don’t fix themselves — and waiting usually makes things worse.

If you’ve noticed slow drainage, bad smells, or rising water levels, it’s time to get it checked. Early drain clearing is faster, cleaner, and far more affordable than dealing with major damage later.

Contact us today for fast, professional help with blocked drains.

How to Fix a Dripping Tap (And Why You Shouldn’t Ignore It)

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A dripping tap might seem like a minor annoyance, but over time, it can lead to bigger problems—both for your home and your wallet. Whether it’s the kitchen, bathroom, or laundry, that slow, steady drip can be a sign of something that needs fixing fast.

In this article, we’ll explain why taps drip, the potential consequences of ignoring them, how to fix a dripping tap, and when it’s time to call in a professional plumber.

Why is My Tap Dripping?

There are several reasons a dripping tap might occur:

  • Worn-out washer or O-ring – The most common cause. Over time, washers inside the tap wear down and can no longer form a tight seal.

  • Damaged valve seat – This is the connection between the tap and the spout. If it becomes corroded or worn, it can cause leaking.

  • High water pressure – Excessively high pressure can cause water to leak out of your tap even when it’s turned off.

  • Loose parts or fittings – General wear and tear or poor installation can lead to small leaks.

How Much Water Does a Dripping Tap Waste?

You might be surprised to learn that a dripping tap can waste up to 20,000 litres of water a year—enough to fill a small swimming pool! That’s not only bad for the environment, but it can also add a significant amount to your water bill over time.

Can I Fix a Dripping Tap Myself?

If you’re comfortable with a bit of DIY, you might be able to fix a dripping tap yourself. Here’s a basic step-by-step:

  1. Turn off the water supply – Locate your isolation valve and turn it off to prevent flooding.

  2. Plug the sink – Just in case you drop a small part.

  3. Remove the tap handle – This usually involves unscrewing a cap or cover to access the internal components.

  4. Replace the washer or cartridge – Depending on your tap type (compression, ceramic disc, ball, or cartridge), you’ll need the correct part.

  5. Reassemble the tap and turn the water back on to test for leaks.

If the drip continues—or if you’re unsure what you’re doing—it’s best to get help from a licensed plumber.

Why You Shouldn’t Ignore a Dripping Tap

While a dripping tap may seem harmless, it can lead to:

  • Increased water bills

  • Water damage to benchtops, cabinetry, or walls

  • Mould and mildew growth

  • Corrosion or further damage inside the tap system

Fixing a tap early is often quicker and cheaper than dealing with the consequences later.

When to Call a Professional

If you’ve tried replacing the washer and your tap is still dripping—or if you’re dealing with unusual water pressure or leaks under the sink—it’s time to get in touch.

Got a leaking toilet? Here’s what you need to know

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One of the most common calls we get here at Plumb is:
“My toilet is leaking.”

If that sounds familiar, you’re not alone. A leaking toilet is one of those everyday plumbing issues that’s easy to ignore — until you realise just how much water it’s wasting.

In fact, even a moderate leak can waste up to 1,000 litres of water a day. That’s a huge amount — especially if you’re on a water meter, or if you’ve been affected by low water levels like we sometimes experience here during Wellington Summers. Whether you’re environmentally conscious or just want to avoid a higher water bill, a running toilet is something worth fixing quickly.

How to Spot a Leaking Toilet Early

The good news is that you can often catch the issue before it worsens. Keep an eye out for:

  • Water slowly trickling into the bowl between flushes

  • A faint, constant ripple on the water’s surface

  • Older toilets with an overflow pipe on the cistern may show visible drips

These are all signs your toilet may be running — or “leaking” — even when it hasn’t been flushed.

What’s Really Going On?

Here’s the thing: while we call it a leaking toilet, it’s usually not the toilet bowl itself that’s leaking. The problem almost always lies in the cistern — the tank at the back that holds the flush water.

Over time, the rubber and plastic components inside the cistern wear out. Cleaning chemicals and water additives can also contribute to corrosion. As a result, the internal parts that control water flow stop doing their job properly, and water continues to run into the bowl.

Fixing a running toilet typically means replacing or repairing these parts — and the good news is, it’s usually a quick and straightforward job for a plumber.

Need Help with a Leaking Toilet?

If you’ve noticed the signs or just want peace of mind, give us a call. Craig, our experienced plumber, has helped hundreds of Wellington homes sort out their running toilets quickly and affordably.

Don’t let a small leak turn into a big water bill. Get in touch today — we’re here to help.

Why You Should Clean Your Blocked Gutters – Before It’s Too Late

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As beautiful as Autumn leaves are, they often bring hidden problems for homeowners—especially when they end up in your gutters. Blocked gutters can quickly become a headache.

If you’re not a plumber, you may not realise how much damage a build-up of leaves and debris can cause to your guttering and drainage system. Ignoring your gutters could lead to problems such as:

  • Overflowing gutters during rainfall

  • Rust and deterioration of metal guttering caused by damp, trapped debris

  • Blocked downpipes and stormwater drains when leaves wash into the system

Signs Your Gutters Might Be Blocked

Not sure if your gutters need cleaning? Go and inspect your gutters and look out for these common signs:

  • Water spilling over the sides when it rains

  • Grass or small plants growing in the guttering

  • Damp spots or water pooling near the foundation of your home

Why Gutter Cleaning Matters

Regular gutter cleaning helps prevent expensive repairs and extends the life of your guttering. By removing leaves and debris, you’ll:

  • Reduce the risk of water damage to your home

  • Avoid costly drain unblocking services

  • Keep your downpipes flowing freely

  • Protect your roof, fascia boards, and foundation

If your home is surrounded by trees that frequently drop leaves into your gutters, you might also consider a gutter guard installation. Gutter guards prevent build-up and minimise the need for frequent cleaning.

Get Your Gutters Ready for Winter

With Winter fast approaching, now’s the perfect time to book a professional gutter cleaning service. Craig is your local expert—tall, great with heights, and thorough. He can:

  • Clean out your gutters and downpipes

  • Check for leaks and blockages

  • Wipe your spouting clean

  • Install a gutter guard so you don’t have to think about leaves again

Contact Craig now, he’ll be very happy to come round and get your gutters ready.

Everyone Needs to Know How To Turn Their Water Off!

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In the event of a burst pipe or leaking water tank, you will want to turn your water off immediately to minimise water damage to your home.

If a plumber needs to work on your water pipes, hot water cylinder or taps, they’ll likely need to turn it off.

You do this by turning it off at the toby. But do you know where your toby is?

Where can I find my toby?

If you live in a stand-alone house, there are some common places you can look for your toby.  It is usually near the front boundary of your house, often in line with a front hose tap.  Look in the garden, grass or footpath area by the boundary of your house.

In townhouses, the toby for each house is more likely indoors, such as in the garage or hot water cylinder cupboard.

Apartment buildings have a single toby that controls the water to all apartments, usually outside on the boundary.  Each apartment will also have its own toby, located somewhere inside the building, but not necessarily in the apartment.  They can be hard to find!  Try looking in your hot water cupboard and under the kitchen sink.  Your body corporate may have a plan of the building’s plumbing that could be helpful.

What am I looking for?

Most tobies are located in the ground, under a lid.  Older tobies often have a square metal lid.  Newer ones usually have black or blue oblong plastic lids.  They’ll often have “WCC” (Wellington City Council) on them.

In a townhouse or apartment building, they may be in the wall, within an access panel.

What if I Can’t Find my Toby?!

The Wellington City Council will both locate and repair tobies at no charge as it is their responsibility to provide water to each home. Essentially, the toby is where the Council plumbing ends and your private plumbing begins.

How do I Know If My Toby is Working?

Check that the handle turns easily enough both clockwise (water off) and anticlockwise (water on).  To check that it’s working, turn it clockwise then turn on one of your taps and make sure it is indeed off (you would expect some water to come out initially as it drains water that was already sitting in the pipes).

 

If you don’t know where your toby is, go and look for it now! If you can’t locate it, contact our plumber, Craig, or the Council to help you out.