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rads vent ok, there is a vent above the cylender which i get cold water from - when opened. i took the thermostat out for a short while and the pipes got very hot (boiled) upto this vent close to the indirect entry to the cylender. steam and hot water came out for a few seconds then it very...

i have a glow worm space saver, since draining to replace the pump no hot water is present, it has 2 flow and 2 returns and the flow and return for the rads are hot, only cold water comes out of the hot tap. the hot water flow from the boiler feels warm near the boiler but as you move your hand...