my thoughts on using solar to space heat and DHW is treat them as completely seperate systems that happen to share the same storage tank. My "plan" is to just pump heated water from the tank to a radiator to begin with. eventually I hope to add radiant tubing under the bedrooms then I'll just pump straight through them when additional heat is needed. No need to do an exchanger on that part of the system since you don't drink the water.
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