Hi, I have thermo mixer bar shower, it runs off a combi with just over 1 bar of pressure. When I turn on shower I have no hot water. I have tweaked the iso valve on the cold, which is nearly off, still no joy. I run my hot tap on basin to get hot running, then turn on shower I get hot for a short while, and again it runs cold. Could my problems be solved with a shower that only need 0.5 bar to run. Any ideas?. Thanks for reading