Estimate heat and input energy for a known water volume and temperature rise.
For water, one litre is approximately one kilogram.
Target temperature minus starting temperature.
Heat delivered to the water divided by input energy.
Heat delivered to water
4.65kWh
Required input energy
5.17kWh
Uses a constant water heat capacity and ignores tank, pipe and standby heat losses. Do not use this estimate to set a safe storage temperature or size electrical protection.