Turns out the stat in the immersion heater was set at 80 degrees which over the course of a full night heated the water in the header tank. Its now set at 55 and seems to have done the trick.
Just had a new bathroom fitted along with a shower pump for conventional system. Boiler is working OK but not getting hot water to radiators. Cold taps are giving very hot water. Seems like an obvious answer to me but plumber insists he can't possibly of made a mistake. Anybody know exactly what he ...
