The important thing with electric showers is the Kilowatt rating of the heater but all electric showers are badly affected by hard water. There only advantage is the ability to have a shower at any time without having any stored hot water available, if this is not important then it is best to consider other types of shower. As a rule and based on many years of experience with various manufacturers we tend to recommend one particular model which has a thermostatic temperature control and comes with a choice of 8.7 or 9.8Kw heaters.