Calculator

Electric Water Heater Cost Calculator

Estimate the electricity an electric tank or heat-pump water heater uses each month.

How it is calculated

Heat needed (kWh/day) = litres × 0.001163 × temperature rise °C, divided by the system’s efficiency (heat pumps move ~3× more heat than they use), plus standby losses.

Results are estimates for planning, not bills or professional advice. For generator hookups use a transfer switch installed by a licensed electrician.

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