Question: what is the difference in shower kw?
Answer: There are typically three different power ratings available in electric showers, 8.5kW, 9.5kW and 10.5kW. The cheapest to run and to purchase are the 8.5kW. ... So electric showers, 8.5kW rated will have less power and the water will need to pass slower (less pressure) past the heating element the hotter you want it.