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%.
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.
Why homeowners are choosing OneEnergy.nz
Simple
No complicated or messy install, fits directly to your hot water cylinder.
Efficient
Every watt produced goes into heating your cylinder.
Affordable
Smart technology that lowers upfront costs and delivers ongoing energy savings.
How our Solar Hot Water Heating works
See why Kiwi’s love us
I have much more hot water now, and it no longer runs out. I have my hot water on midnight to 6am ripple control which meant it would usually run out during the day. My kids are now able to have longer showers in the evening which is a real treat. The team were great to deal with and very helpful. I love using solar to do all the water heating during the day.
Once I saw how much of our bill was just heating water, switching made sense. I’d looked at older systems, but they felt dated. The One Energy setup is modern, fully electronic, and easy to manage. The team were great to deal with — straight-up and helpful. Since installing, the app makes it simple to let solar do the heavy lifting, and the savings are clear. I’d highly recommend One Energy for smart tech and outstanding service.”
I have noticed a significant change in my power bill and we are constantly using our heat pump so the new system is working wonders. I’d definitely recommend it to friends and family as we’re saving money during the winter months when power bills are usually at their highest. Thank you for helping my family and I to make the most of our hot water without a worry 😊.
Over the last eight months, we’ve clocked an average 33% decrease in our monthly kWh power usage. Seeing those numbers and the related cost drop while our comfort stays the same is a great feeling. A smart bit of kit installed by a One Energy team that takes genuine care and responds if there are any issues.
Our family loves taking long showers and so our electricity bills have always been high. Adding OneEnergy’s solar hot water heating has made a big difference to our power bills, especially in sunnier months. Installation was quick and simple, and the online dashboard clearly shows how and when we are saving money. Thanks, OneEnergy!
We use hot water conservatively in our house, and the OneEnergy system shows us exactly how much energy we use on heating hot water.
The OneEnergy installers fitted the system in under 3 hours and we are amazed with our savings.
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.
Proudly supported by:
Member of:
Four simple steps to solar hot water
We make moving to smarter energy as simple as using it. Our process is streamlined, and designed to get you up and running with zero hassle.
Let’s get started
Share your details and our team will be in touch to help you take the first step toward smarter energy.
Custom Proposal
We'll let you know how your panels will look and what estimated hot-water energy savings to expect.
Easy Installation
Installation takes just three to four hours, delivering a reliable solar-electric hot water system and instant energy savings.
Enjoy Savings & Sustainability
Enjoy lower energy bills, smaller carbon footprint, and reliable hot water all year round - even on rainy days.
Commonly asked questions
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% p.a.
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.
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.
Yes - OneEnergy's Hot Water qualifies for green home loans from all NZ banks.
Get your no obligation quote today!
We’ll create a tailored, no obligation proposal showing exactly how your solar-electric system will look on your home, including panel placement and estimated hot-water energy savings.
