Further research has gotten me answer to my question. High water temp storage for low temp radiant heating is ideal. A 3-way mixer before floor loop(hot side) allows cooled loop water to reenter floor loop to "cool" hot side or return to storage tank. Thus no water needs to enter exit system. Did not know mixer could do that(seems there a many kinds of mixers). Now appears that the most economical heat source to get the storage water to temp is next. Sorting theory from economic reality. DIY again seem to offer the best solution. FYI, thermal mass can be added to a structure during an opened wall remodel by filling stud cavity with sand filled recycled alum bev. cans. in non insulated wall. Structure must be able to hold extra load(interior load walls are good) and simple wood raceway can used to space around horz elec runs. Cans stack really well.
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