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Yet another boiler selection question TT with built in DHW or indirect?
I am in the process of building a new home in northern Michigan. I have some questions regarding radiant heat source. I just read homeowner1’s thread and looks like I have the same questions with a slightly different set of conditions.
A bit of background:
• Total heated area is ~4000 ft. sq.
• Design temperature is -8°
• Well insulated and sealed: R38 walls and R60 ceiling
• Calculated heat loss is 43K Btu.
• There is a 24K BTU direct vent fireplace w thermostat control which is supposed to be ~70% efficient that could be used for backup / supplemental heat.
I had a contractor that suggested the TT 110 Excellence with integrated DHW, but I’m not sure if 76K BTU is overkill for this application. I should be able to use a TT Prestige Solo 60 but by the time you add an indirect DHW tank, and a couple extra circulators it will probably cost more. I compared the DHW capacity of the 2 units (using Dave Yates method) of the 2 units and it was dead tie using a 40 gal indirect with the TT60 (either would meet my needs)
I am a bit concerned about short cycling with the 110 as I will have several zones but it seems like there is not much safety factor at 47K BTUs with the TT 60. Looking for suggestions as to which one you would pick and why.