Convert from Gas to Solar Electric Hot Water

Gas supply is falling faster than expected and already expensive gas prices keep rising. Switch now to OneEnergy’s solar electric hot water heating technology (learn more).

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Easily fund 100% with a Green home Loan from ANZ, ASB, BNZ, Kiwibank, and Westpac .

How our Gas Conversion Works

Our Solar Water Heating Benefits

Escape rising gas costs and supply risk

Gas prices have become volatile and supply is increasingly constrained. Prices are forecast to rapidly rise as Aotearoa phases out gas.

Beats Heat Pump Hot Water

Enjoy a no-noise, no-maintenance solar electric water heating system that has no moving parts and much longer lifespan. It’s the sensible solution.

Comparison Table

Solar electric hot water

Hot water heat pump

Monthly Hot Water Power Bill Savings

75 - 90%

60 - 75%

No Plumbing Required

✅

❌

No Noise

✅

❌

Servicing & Maintenance Free

✅

❌

Lifespan

25+ years

7 - 10 years

Long-term savings

Once installed, your sunlight “fuel” is free providing you with a long-term heating solution and releasing you from dependence on rising energy prices.

Take Control

Easily track your solar heating water system performance and energy savings with smart monitoring, so you always know the value you’re getting.

Lower your carbon footprint

Every litre of hot water heated by your own solar electricity displaces fossil fuel emissions.

Grid Independence

Reliable even during power outages, our solar electric water heating system ensures you have hot water whenever you need it, independent of mains power.

Our Easy Conversion Solution

OneEnergy's revolutionary approach to solar hot water heating makes it easier and more efficient than ever to transition to solar energy, right across Aotearoa.

Decommisioning

We decommision your existing gas califont or gas cylinder and dispose of this.

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Cylinder Installation

We install an outside electric hot water cylinder in the same location as your outside califont, or inside to replace your existing gas hot water cylinder.

Solar Installation

We install the solar panels onto your roof, and wire through to your new hot water cylinder.

Enjoy Savings & Sustainability

With your new OneEnergy.nz system, you enjoy lower energy bills, a reduced carbon footprint, and dependable hot water all year-round - even on cloudy days.

Ongoing Support

Our team is here to support you after installation, ensuring your system continues to work at its best. We’re just a call away if you ever have questions or need assistance.

What Our Customers Say

Craig

Auckland

solar hot water heating system installed on roof

In February we had the OneEnergy system installed in our house...

Jean

christchurch

The OneEnergy installers fitted the system in under 3 hours and we are amazed with our savings....

Bryan

auckland

We use hot water conservatively in our house, and the OneEnergy system shows us exactly...

INSTALLED FEBRUARY 2025
MARCH SOLAR GENERATION : 298 kWHr

"In February we had the OneEnergy system installed in our house. We are large hot water users and the grid booster provides a small top up daily. We saved $90 in March and our monthly power bill has dropped to less than $100. I rate this as one of our best investments."

INSTALLED FEBRUARY 2025
MARCH SOLAR GENERATION : 285 kWHr

"The OneEnergy installers fitted the system in under 3 hours and we are amazed with our savings. In March we spent less than $5 for the whole month on electricity for heating our hot water. It’s such a sensible idea to use our existing hot water cylinder to store all the day’s solar energy rather than selling it to our electricity company. "

INSTALLED FEBRUARY 2025
MARCH SOLAR GENERATION : 253 kWHr

"We use hot water conservatively in our house, and the OneEnergy system shows us exactly how much energy we use on heating hot water. In March all of our hot water electricity was supplied by solar other than 2 days where we had a small top-up of less than $1 . The OneEnergy system now supplies 99% of our hot water heating."

Join Us on the Journey to Sustainability

Let’s make the sun work for you! Whether you’re interested in solar water heating for your home or dairy farm, our team is here to guide you every step of the way. Together, we can create a future where everyone enjoys the benefits of clean, affordable energy.

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Common Questions about Gas Conversions

Will I have hot water on cloudy or rainy days?

Yes. If there is not sufficient Solar heating, the system will automatically top-up with grid power to make sure you are never without hot water

Does the system work during power outages?

Yes, during grid power outages our system will continue to use all the electricity available from the Solar Panels.

How many solar panels will I get ?

We will supply and install 4 or 6 premium solar panels rated by manufacturers to produce more than 1.8KW or 2.7kW peak, covering about 8-12 square meters of sunny roof space.

Will I need mains power for this system to work?

No. Mains power is not needed to heat solely from Solar and Sol•Flare will work completely fine without mains power. However, for comfort of guaranteed hot water on poor weather days, mains power will be required to provide a boost.

What is the benefit in Sol•Flare heating water to 70 °C?

Hot water cylinders generally only heat to 60 °C by mains power because there is additional mains power waste to heat it hotter than 60 °C . However Sol•Flare is able to water to a higher temperature like 70 °C with the solar power, which effectively increases the storage capacity of your HWC by 20% - expanding the size of your hot water cylinder without changing your cylinder. We all love longer showers !!

Is the Sol•Flare Wi-Fi enabled?

Yes, Sol•Flare includes connectivity features, allowing for system monitoring, performance data analysis, and potentially remote control via a companion app connected to your home internet. A WiFi connection is advisable but not essential.

Will I still have hot water on cloudy / rainy days, or during winter ?

Yes, you will still have piping hot water. If solar generation is low because of weather conditons, the Sol•Flare will seamlessly boost your hot water from mains power. Solar is always prioritised so that you minimise use of mains power..

How will the system perform on those cold clear frosty winter mornings ?

Very well. Solar panels actually perform better the colder they become, and because the panels are rated to -25 °C, you will still get good performance on those cold clear frosty Otago mornings.

Can I have solar panels on both East and West roofs?

Yes, the system can handle panels on multiple orientations like East and West. Sol•Flare uses advanced power management technology to maximise the energy harvest and to guarantee hot water.

Does this system require a specific roof type?

No, the system uses roof-specific mounting kits that allow for secure, weathertight installation on almost any roof type, including corrugated iron, decramastic, long-run, concrete or ceramic tile, and flat roofs.

What are the minimum and maximum distances allowed between the solar panels, Sol•Flare, and the hot water cylinder?

The maximum distance between the panels and Sol•Flare is limited by voltage drop, which generally allows for long runs up to 50 metres. Sol•Flare is installed beside the hot water cylinder, which fits for 99% of houses. Typical installations will place the solar panels less than 15 metres from the hot water cylinder. There is no minimum distance.

I live in a high wind zone, how secure are the solar panels?

The mounting system is engineered and certified to meet the wind load requirements governed under New Zealand building codes, ensuring the panels are securely and reliably secured.

How are the solar panels secured to the roof?

Solar panels are secured using certified black anodised aluminium racking and mounting brackets screwed into the purlins of the roof structure. This creates a robust, structurally compliant anchor.

What holes do you need to put into the roof?

Our building code compliant and certfied mounting system requires roofing screws to be fastened through the roofing material for the mounting brackets. These mounting brackets have a rubber foot that compresses to guarantee waterproofing once fitted. A cable penetration will be made and fitted with a UV approved flashing that is meticulously installed, sealed and waterproofed to maintain the long-term weatherproofing of your roof.

Are the solar panels reliable, and how durable are the panels in New Zealand weather conditions?

Yes, all solar panels are compliant to NZ standards and are highly reliable, durable, and suitable for withstanding harsh NZ weather conditons. This includes high UV exposure, rain and hail impact, and cold temperature and frost extremes. We supply Tier 1 solar panels backed with a manufacturer's warranty.

How do I get a Green Loan for a Solar System?

Many NZ banks offer "Green Loans" or interest-free home loan top-ups for eligible energy-efficient upgrades. You apply directly to your bank utilising our quote, which will provide your Bank with comfort that installation is completed by a reputable installation business.

Does OneEnergy.nz handle the council building consent process if required?

No, building consent is not generally required and responsibility lies with the home owner to ensure they have local consent if this is required.

How does OneEnergy.nz's system compare to a Hot Water Heat Pump ?

A hot water heat pump consistently uses mains power to extract heat from the air with high electrical efficiency (CoP). Whereas OneEnergy.nz's Solar Electric Hot Water uses free solar electricity to run a heating element and tops up any heating shortfall with a mains boost. A hot water heat pump relies on mechancial moving parts and fluids, whereas OneEnergy's Solar Electric Hot Water has no moving parts and utilises solar panels that have a manufacturers warranty of 25 years. Over a 25-year lifespan, the Solar Electric Hot Water system will provide the greatest net savings and highest long-term return due to the free solar power source.