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I have now convert my open vent heating system to 2 x 2port (S-Plan) system and have also added the 22 mm vent pipe that loop back into the Expansion tank. The loop height is 450 mm above the level of the water in the tank. The vent pipe just end about 120 mm above the level as...

I have to replace a radiator with a larger size. I have micro bore 8 mm pipes and want to connect to the radiator valves with internal reducer 15 mm to 8 mm. I have bought the kit which is 3 pieces. It seem ok where the 8 mm olive goes but the packet does not explain which side goes into...

At my home heating system, the pump signal is picked up from the same point as boiler. That means the pump is switched off at the same time the boiler is switched off. The boiler was installed by an heating engineer about 6 years ago. It is not connected to "over run signal from the...

If I have 2 x 2 port valves, means one for heating and other for hot water, must I have a by pass valve? otherwise when both heating and hot water valves as shut, there will not be any path for the water to flow. This pumped water then should flow through the by pass valve that should be open...

I have an Automatic By Pass valve model SBV22 by SUNVIC. I am trying to find a simple way to calibrate setting so that it opens when two ports valves in s-plan systems are shut (no heating or hot water) and minimum flow when any of the heating or hot water is on. The method described is...

I have Open vent central heating system with mid-position valve for heating and hot water. The cold feed comes from the expansion tank in a 22 mm pipe but there is no VENT pipe for any expansion of water. I wonder whether I do have to have this pipe? I asked the plumber who installed our...