Guide · Hot water & backup power
Can a geyser run on an inverter?
Short answer: usually not. Here's why, and what to do instead to keep hot water without draining your batteries.
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The detail
Why geysers and inverters don't mix
A typical electric geyser element is rated at 3 kW or 4 kW and runs at full power until the water is hot. Most home inverter and battery systems are sized for lights, plugs, Wi-Fi, TV, the gate and the alarm. Put a geyser on that circuit and it can overload the inverter or flatten the batteries quickly.
Better options
- Timer or remote switch: heat water only when mains power is on and you need it. We install remote switches for geysers and other appliances.
- Solar geyser: the sun does most of the heating, with the element as backup.
- Heat pump: heats water using much less electricity than an element.
- Insulation: a geyser blanket and lagged pipes keep water hot for longer.
Where to start
Our electrical teams can check what your inverter can safely carry, and our plumbing teams can quote for solar or heat pump conversions. Backup power · Remote geyser switches · Geyser services
Can a geyser run on an inverter?
Usually not. A standard electric geyser element draws 3–4 kW continuously while heating, more than most home inverter and battery systems are sized for. It's normally left on mains and controlled with a timer or remote switch.
What's the best way to have hot water during power cuts?
Heat the geyser while the power is on using a timer or remote switch, insulate the geyser and pipes, or switch to a solar geyser or heat pump to cut the load.
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