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Yes, thank you, that seems to have done the trick! Brilliant, many thanks, so simple after all.

I've wired the stat to the pump as descibed, but what I can't understand is why, when I plug in the power that that the pumps is activated. The stat is set to 50 degrees. When I turn it down to just about zero, the pumps stops. What I want to happen though, is for the pump NOT to run...

Sorry, yes, neutral. So if the live goes to the common terminal, I then run a wire from 'call for heat' to the live on the pump? So, the neutral wire from the mains - does that just go straight to the neutral on the pump? Same with earth? Straight to the earth on the pump? I do have...

How do I wire a cylinder thermostat to a central heating pump? I have an HTS3 cylinder thermostat that I want to use to turn on an off a Wilo Gold RS50 pump. This is part of a very simple system I have created in a garage. I am heating the water in the tank separately from any boiler or the...