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Re: Central Heating question
A lot of combi boilers now have a fixed water temperature of 60c (too hot for me!).
All but one of your radiators should have a TRV fitted that control that room's temperature. The one without a TRV should be where the wall thermostat is (hallway usually).
Letting a house cool whilst you're out is possibly a bad thing as it may need quite a while, and thus a lot of energy to get the house warmed up again. Check for decent wall and roof insulation!
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