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Thanks again, Canatloup63. I see what you mean now and it does sound like a good safety measure although in my case ('coz I'm slow) it might take a lot more than an hour. As it happens, I have done something that I should have done at the start: I asked Vaillant . They say that it's ok to...

Thank you for your replies, muggles and cantaloup63. Muggles: what causes the boiler death? Mine's a Vaillant Ecomax 835/2, by the way. Cantaloup63: Why would I want to connect a radiator to flush through? I will flush the whole lot after I've finished the repairs. I'm not asking...

This could be fun. I have a combi boiler. I have to do some work on the heating system which might take a few days. I have a notion to shut the CH service valves before I drain the radiators, leaving the boiler pressurised, in the hope that I will be able to use the boiler for hot water...