Power your existing hot water cylinder with solar

Our award-winning electric hot-water system helps you spend less on your monthly power bill. It’s efficient, easy to install and proven to reduce household energy use by up to 50%.

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Make savings, not compromises.

OneEnergy helps you take control of your power bills without the expense or hassle of a full solar installation. Our modern solar-electric system is wired directly into your existing hot water cylinder, harnessing the sun to heat your water efficiently. No thermal tubes, no plumbing, no complex setup - just reliable technology that fits into daily life and delivers results from day one.

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Why homeowners are choosing OneEnergy.nz

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Simple

No complicated or messy install, fits directly to your hot water cylinder.

Efficient

Every watt produced goes into heating your cylinder.

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Affordable

Smart technology that lowers upfront costs and delivers ongoing energy savings.

We make it Easy

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

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Let's Take the First Step

Submit you contact details and we'll be in touch to take the first step.

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Custom Proposal

We'll provide a custom proposal showing the layout of the panels and your solar heating water energy savings.

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Easy Installation

After you approve the proposal, our expert installation team will handle everything from start to finish. With an installation done in under 3 hours, you’ll have a reliable solar hot water heating system with immediate savings.

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Enjoy Savings & Sustainability

With your new One Energy system, you can enjoy lower energy bills, a reduced carbon footprint, and dependable hot water year-round—even on cloudy days.

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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.

How our Solar Hot Water Heating Works

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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...

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Jean

christchurch
Solar Electric Water Heating in Christchurch

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

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Bryan

auckland
Solar plate installed

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

INSTALLED FEBRUARY 2025
MARCH SOLAR GENERATION : 298 kWHr
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Solar installation

"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."

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INSTALLED FEBRUARY 2025
MARCH SOLAR GENERATION : 285 kWHr
Solar Electric Water Heating in Christchurch
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"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. "

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"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."

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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.

Common Questions

What is the return on investment?

A full installation in an average household will have an expected payback of under 5 years, and your panels will produce electricity for more than 25 years - that's a great return on investment of almost 20% .

Will I be locked into a long term contract for my system ?

Absolutely not, the system is owned outright by you to enjoy the benefits of solar hot water heating powered by the sun for many years.

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

Can I get a Green Home Loan?

Yes - OneEnergy's Hot Water qualifies for green home loans from all NZ banks.

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