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New Construction Tankless Heating
I am in the process of buying a new construction property. Everything about the 1780 square foot townhome is great except I'm concerned about the Rinnai tankless heater being tasked with space heating plus domestic hot water.
The space heating application is through one level of in-floor radiant heat and two levels of in-wall hydronic fan coils. It seems this application is becoming very common for new builds in the area.
My question is if there is any way to mitigate the wear and tear on the unit. I am far from an expert in this area, but I believe this is installed as an open loop system (though perhaps indirect since I see a heat exchanger has also been placed on the wall?). For what it's worth, I'm also hopeful that the newly insulated home will retain heat fairly well.
That said, can you ever add a wall mounted boiler (if space allows) to free up wear on the Rinnai? Or would it be more cost effective to ultimately plan to instal a combi unit in place of the Rinnai if / when it gives out past the 3 year warranty?
Finally, are there any resources to understand what a combi system might cost as I factor that a potential future cost of the new home?