How would I choose a pump? I already have 2 zones. 1 for the upstairs and 1 for the hot water tank so I can see basically how it all works. The water goes from the boiler to the pump to the radiators and then back to a manifold and into the boiler. There is armored romex going from the power switch to the pumps. The end of the manifolds are just caped off so I can simply add on.
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