Oh I never said the tekmar stuff was inexpensive. Quite the contrary. Caleffi and uponor are comparable brands of the same type of equipment. If I was s building scientist or architect trying to heat and cool my bio-dome or skyscraper, I would consider using something along these lines. I was referring to the training and support materials and literature these guys provide, because that's how the super pros do it.
If I was going to make something like that, I would probably use one of the 3 way valves and adjust it by hand or use an outdoor reset valve if I wanted a set it and forget about it type of rig. There are lots of ways around the barn, so to speak, and some ways are much more economical than others. Using "bang bang" valves (zero pressure solenoid) and anti water hammer bladders is most likely the cheapest way to do it. Not so smooth and quiet though.
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