Independent energy/ CALCULATOR
Shower water, energy and running cost
Estimate water use, water-heating energy and combined operating cost for a household shower pattern.
Measure with a container and timer, or use a verified fixture flow rate.
Use an observed average rather than the longest occasional shower.
Enter the household total averaged over the chosen period.
Mixed shower temperature minus incoming cold-water temperature.
Heat delivered to the water divided by purchased energy.
Use a billing month, season or year.
Use the relevant electricity or delivered-fuel energy price.
Include wastewater charges when they follow metered water use.
Shower water per day
128.0 L/day
Water in selected period
3.84 m³
Heat delivered to shower water
134.0 kWh
Purchased heating energy
148.8 kWh
Water-heating cost
29.77 currency
Water and wastewater cost
9.60 currency
Combined selected-period cost
39.37 currency
Constant average flow, duration, temperature rise and efficiency. Pipe warm-up, storage standby, recirculation, tariff tiers, fixed fees and bathroom ventilation heat loss are excluded. This is an operating estimate, not a heater sizing or safe-temperature calculation.
Continue your calculation
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