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Whatever you feel comfortable at is the question, 75/80 is usually the max most combi will go. Bills will be high as I said previously because gas costs a bloody fortune now but with a new boiler the bigger the house usually the more you’ll save.
The thing is you never go to a house and say you’ll save £xxx per year as then your putting yourself in one by giving a figure. It’s all horse for courses
konastab01
@pifko
@konastab01 are there guidelines on ideal CH temps? New combo boiler in Nov-20 and although very quick to heat house (3-bed semi), bills have been quite high. Gas engineer set it at 75C, but I have no idea what the previous boiler was set to. Is 75C roughly the hottest recommended CH temp?