Question: how much does it cost to run a 9.5 kw shower?
Answer: Electricity is generally charged at about 12p per KWh, so for a 10 minute shower using a 7.5kw shower would cost 15p. A power shower could use around 15litres/min, so a 10 min shower would use 150litres of mains water, heated from around 8°C to 30°C.