How we calculate consumption
We multiply heater power by the duration of each shower, the number of daily uses and the number of days in the month.
kW Γ minutes Γ· 60 Γ showers Γ days Γ β¬/kWh
Every minute matters
A 7.5 kW unit uses 0.125 kWh per minute at full power. Cutting two minutes from each shower can make a visible annual difference.
Power and flow rate work together
The temperature reached depends on heater power, incoming water temperature and water flow.