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    can a combi boiler be left running with the mains supply off

    The loft tanks are empty - the whole system is mains pressure since the combi was fitted. But as I have pipes running in various floor and wall ducts I wanted to keep the structure warm. Having the main 'off' would be very reassuring, as a neighbour had his house completely wrecked last year...
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    can a combi boiler be left running with the mains supply off

    I'm leaving my house empty for February, and wondered whether I could leave the central heating on if I turn the main water supply off? Its a Worcester CDi combi. I was thinking of leaving the thermostat set at about 10 degrees and the heating set on 'on', to keep the house OK for the...
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