Calculator
Water Heater Electricity Cost Calculator
Estimate the electricity an instant shower heater or storage water heater uses each month and what it costs in pesos.
How it is calculated
Heat needed (kWh/day) = litres × 4.18 kJ/kg·°C × temperature rise °C ÷ 3,600, divided by the heater’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 changeover switch installed by a qualified electrician.
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