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The hot water cylinder has a thermosat strapped to the side and the boiler has a factory fitted limit thermosat which the instruction book states is preset to oprate at 95'C and a thermostat that controls the output temp to a maximum of 82'C. I guess this has nothing to do with the loss of...

The system has an over heat stat on the side of the tank, frost protection stat, over pressure and under pressure switches close to the boiler in the cellar. haywardave

Mick The boiler is a gas Clyde 045/5 installed in Feb. 1980. It is a pressurised system with a red expansion vessel which usually hold it's pressure fine at just over 1 bar from memory. It runs both the heating (15 rads) and hot water controlled by a timer and a couple of valves. Hope this...

Hi guys Over the past couple of weeks I have had to top up the pressure in my hot water/central heating system every 3-4 days. I have access to most of the pipe work in the house and can find no evidence of a leak anywhere. I have bled the radiators. I would guess that I have to let the water...