Several fine contractors have recommended installing a mod-con hwh as a boiler for my 40-50Kbtu NY home. (Versa Flame is one suggestion.) Seems to cut down considerably on installation costs since the unit serves as a boiler, hwh and buffer tank all in one. And because of the buffer tank function, oversizing it a bit--if smaller sizes are not available--seems not so critical since it would not be short cycling. I'm assuming these type of units are every bit as rugged as mod con boilers in terms of handling the duty cycle.
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