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Ratio Of Required BTU Between Direct and Indirect HWH?
I know the answer will depend on boiler and indirect specs, etc. but generally if your soon-to-be-replaced direct 50 gallon 30kbtu fired hwh has been plenty adequate for years (nominally fires at 40k but actually measures at 30k) would a 51k DOE/44kbtu ibr net boiler generally give equivalent results for a 50 gal indirect or a TurboMax 23? Household two people, back to back showers is highest draw, 2.2gpm flow. Or does this simply have to be calculated?