We have just had a Tavistock thermostatic shower fitted(kinetic brand) with the bar controls. It's in the downstairs shower room- we have just had a 937 Vailliant Eco warm combi boiler fitted. No matter how much we move the control towards hot or cold it stays the same warmish temperature, but doesn't get colder or hotter. I phoned Tavistock and they asked if the shower was calibrated on installation. All I am getting from the plumber is 'some showers are just like that' and it might be faulty. I am beyond p@@sed off to be honest as we are reliant on it whilst upstairs is renovated. PJ what do you think- I value your opinion!!