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I came to the same conclusion as you except for the bypass and gate valves, however had a thought whilst the wife was watching eastenders, what if the demand for hot water was constantly on...defect on the water thermo.... after looking at, it believe it or not, i had fixed the thermo to the...

I have added new radiators downstairs and a new boiler, everything seems to be working ok except that when CH and HW is on at the same time the radiators down stairs do not heat up, i have a y plan system with a 3 way valve which is working ok, when switched to CH only the valve moves to its...