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Tinkering out loud on a way to build an inexpensive HX tank. I think this would work with a standard electric water heater also. This tank had 2" ports so I was able to get 3/4 CSST into it.
Remove the top and bottom element, thread in some 1/2 CSST fro the HX. Use the CSST termination fitting to seal the CSST into the tank connection.
The DB tank is a $30, 6 gallon air tank from Harbor Freight, with one additional nipple brazed in the bottom.
Bob "hot rod" Rohr
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me