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Estimate thermal energy, electrical input, heat loss, and cost to raise a water volume by a chosen temperature.
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Water mass, specific heat, and temperature rise create thermal kWh; efficiency grosses up required electrical input.
Thermal kWh = litres x 4.186 kJ/kg°C x temperature rise / 3600; input = thermal / efficiency.
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Standby, tank, pipe, mixing, inlet variation, thermostat, and recovery losses require separate allowance.
This is an educational planning result, not a structural, electrical, thermal, solar, battery, generator, or safety design. Confirm specifications, units, codes, and professional requirements before acting.