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Hi! Have a EBP wireless room thermostat to add to fully pumped open vent CH system via Dayton motorised valve. Confusion is, at the receiver "Thermostat wiring has no polarity requirement", and the illustrated wiring diagram has two terminals - one marked, " TH" and the other "GND". Further...

I am re-hashing the CH/HW system during course of updating a 40 year old house. The oil fired boiler on the ground floor is a Worcester Danesmore 20/25, and the pump a Grundfos UPS 15.50. The pump is located on the CH Return, about a meter from the boiler. Question: is this the a good location...