I'm looking to install thermostatic shower controls and a fixed shower head. I have a combi boiler and get 1bar pressure. I wanted to know if it was necesarry to get high pressure valves for 1bar or whether low pressure valves would work. Similarly will I need a 1bar shower head or will a low pressure head work? If the answer to the questions avove is that both low or high pressure (1bar) valves & shower head would be suitable - then my final question is if I can use a low pressure shower head with high pressure (1bar) controls and vice versa? thanks in advance for your assistance.