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RedRabbit, I haven't read the whole thread (seems there's a few ego battles being fought here !), but..... In a previous property we had a cistern which wasn't closing off properly. It was in part of the house we didn't much use, so it may have been like it for up to 3 months. The water...

MrTherm..... Thanks for your contribution. All you say makes sense and I now not only understand the pipework I have, but also appreciate some of its history! There's a radiator which is not fitted with a TVR (in vicinity of the room thermostat), so the manual bypass is now closed and...

Dan, As before, if TRVs are all closed and valve is heating only, water circulates around the pipes from which radiators are tee'd off. Alternative is that valve is set to water and there'll still be a circuit for the water to follow via ht water tank. In both these cases, as soon as the...

With the bypass closed..... .....there'll always be a 'circuit' for water to travel (ie no dead-ends) as the 3 way valve is open to either tank, radiators or both. .....the radiators warm up quicker and get hotter. I've now switched down the pump speed and boiler water temp and still...

Dan, Nozzle - thanks for your time in replying. What you say makes sense, but I'm afraid that I'm cursed with an inquisitive mind...... As there's a stop valve on the joining pipe, does this imply there's a need to adjust the flow using the valve ? I guess there's already a slight...

I've recently moved and I'm trying to understand the pipe layout of the central heating system. Just after the pump and the 3-way valve, the heating feed is connected to the heating flow return via a 15mm pipe with a stop valve. The valve is set to fully open. I don't understand and am...