How can I work out the running cost of an electric shower?

To establish the electricity cost firstly multiply the kW per hour tariff you are paying by the kW rating of the shower. The cost per shower is then dependant on the number of showers taken per hour. Example for an 8kW shower unit. Electricity tariff at 12 pence per kW hour multiplied by 8 = Total cost of 96 pence per hour. Number of 5-minute showers taken in 1 hour = 12 96p divided by 12 = Total cost of 8 pence for a 5 minute shower