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thanks guys it must be a by-pass valve because there are no thermostatic radiator valves in the house(built buy barrets in the early 90`s). I`ll leave it slightly open then without worrying about blowing things up.thanks again

the above picture shows the cylinder , 3 port valve and pump in my central heating/hot water system .I have an indirect coil type cylinder, with connections as shown in the diagram, with the heated water from the boiler flowing through these connections.i have no idea what what this mystery...