also caveat: There is no such thing as a free lunch. Heating domestic water from your boiler is usually a lose/lose. A fresh water heated does a better job with less firepower. And, on the super efficient boilers, (water not steam) with the 90% plus ratings, when I bailed out five years ago, the lifespan of these units were 10-15 years, compared to almost forever for a good standard efficiency cast iron gas burner. Do the math, and give the laws of physic their due respect.
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