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Its a gravity fed system, sealed and fully pumped (I think). Im not sure what boiler type off hand. Pretty bog standard sytem I think - Boiler in understair cupboard with pump adjacent to it, thermostat and timer on wall outside of cupboard. Pipes go up and beneath the floor to the hot...

The hotwater in my house was getting far far far too hot. Until fixing it last night, I had been sticking the hotwater/central heating on for an hour or so when needed then turning it off again. This seemed fine -everything got roasting dead quick then cooled. I assumed the hot water...