OneEnergy.nz

Power your Existing Hot Water Cylinder with Solar Panels. OneEnergy’s award-winning German solar-electric hot water system connects directly to any existing hot water cylinder, ensuring homeowners spend less on monthly power bills. It’s simple, affordable and proven to reduce household hot water power use by up to 90%. OneEnergy’s system uses electric solar panels and a smart controller to feed solar power directly into a home’s hot water cylinder. This simple setup avoids complex plumbing or battery systems and guarantees reliable hot water backed up by mains power, with great savings.