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Thanks for the reply, but I just need to know about the digital pressure gauge and whether I need to do anything more than open the drain (which is only there because I fitted it 15 years ago when I last had a new boiler 15 years ago as I hung the radiators before the CORGI plumber did the...

Hi I'm new here... I have a 10 month old Vaillant ecoTEC plus 825 combi boiler which so far is excellent. I am refurbing my bathroom and putting in a new towel radiator and new valves and some pipework and so need to drain and refill the system. I have read both FAQs on this, but as the pressure...