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Boiler size for indirect water heater
I'm looking to replace my boiler and water heater. My heating needs can be satisfied by a boiler of 75,000 to 80,000 BTUs. The 45 gallon indirect heater which I'm looking at lists a boiler requirement of 155,000 BTUs. My guess is that hat size boiler would provide the maximum hot water from this system, and a smaller boiler would result in a slower recovery. But, shouldn't a 45 gallon indirect with an 80,000 BTU boiler still deliver a lot more hot water than a 40 gallon water heater with 34,000 BTU input? Thanks.