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Could you be more specific about the NRVs and relays. I know what they are, but would appreciate confirmation of their function in such a system. Also, 'thermoelectric actuators'? Not familiar with those.

Having had numerous problems with motorised valves in the past (mostly due to poor design IMO) I was delighted to read about the Grundfos Pump Plan that not only uses 2 pumps that I think is a great idea, but also eliminates the need for any motorised valves. But as many of you will be aware...