Domestic hot water

Nron_9

Looking for a better solution for large capacity domestic hot water system , looking at a larrs 750 mbh boiler now which can use domestic water through boiler , is there anything better to look at the requirment is 15 + gal per min recovery and space is limited and standard flue is only option for venting , they dont want heat exchangers here only double wall allowed by the city now

oil-2-4-6-gas

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how about a couple of Takagi tankless heaters--or the Rinnai tankless

Rudy

look at Aerco, 70deg temp rise @ 50gpm 1mil btu w/ 10-1 turn down in the space of an 80 gal water heater. expensive though. excelent boiler, second thought would be a lochinvar intellifin, or power fin II both have 4x4 footprint.