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external h/x vs combi waterheater?
My 16 year old radiant heat system consisting of basement in-slab wirsbo is powered by a Lochinvar 75 gal power vented combi style water heater. Last week the 30 psi relief valve began leaking and I isolated the problem to the internal h/x failing. From what I've read on this site the replacement combi style w/h are not to reliable. Since the w/h function of my Lochinvar still operates how feasible is it to replumb the system with an external H/X. That would probably include adding another circulating pump and a check valve? When the Lochinvar finally dies I would replace it another 75 gal PV W/H for a third of the price of a combi. Am I pipe dreaming? layman33