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Hi Mathew Thanks for your help, but the 3 port valves are already plumbed in (one original and one new). The problem is, if I only wire up one tank stat the system works OK but the tank with out the wired stat will obviously not be able to call for heat. I think I need to stop the current...

Can anyone help, I need to wire into my heating system a second hot water tank with a tank stat and a 3 port valve Can anyone help with wiring. The problem I have is that when the original tank stat switches off this sends a live to the original 3 port valve, as this has a wire from the...