Household water use
Shower water calculator
Work out what a shower actually uses, what it costs, and how much energy goes into heating it.
Result
Water used
80litres
Energy to heat it
2.60kWh
At 100% efficiency. A gas boiler at 85% would use about 18% more.
Water cost
0.160£
Heating cost
0.651£
Total cost per shower
0.81£
Annual, one shower a day
296£/year
Method
Volume = flow rate × duration. Energy = volume × 4.184 kJ/kg/K × temperature rise, converted to kWh. Cost combines the water charge and the heating energy cost.