Hydronic Boiler/Combi & Indirect
HI Folks, continuing my theme of asking questions about HVAC improvements. here’s another. New build home, with roughed in hydronic in the basement slab and garage slab. No other emitters currently planned, although possible with a 4-season room next year. I really want heat in the garage, nat-gas heater is posing to be a problem as venting is garbage in all directions, with slopes, property lines, front doors etc. And the cost is >$4000 CAD from all qoute. So Trying to look at hydronic, as it’s roughted in, and seems to be a solid option. We have 4 quotes, one of which was a full air-source to water heat pump install. It was well beyond $40k, so that is paused for the future. The next are focused hydronic installs.
1 – First was using existing hot water tank, and and plate exchanger to heat the hydronic, by far the cheapest, but we’re a family of 5, so I’ve asked this contractor to look at a combi-boiler as I won’t want to decimate my domestic hot water. \
– Can the combi be used to pre-heat the existing hot water tank and also effectively perform hydronic heating as well in this config?
2- Second contractor has simply started with combi and proposed using it to pre-heat the domestic watertank. Same as above.
3 – Last contractor proposed the boiler with an indirect tank.
Cost estimate were from $8200- $14000, boiler proposal besides brand were all 150btu units.
None of them seemed to propose a heat load estimate, as I provided a lot of info, but they did not reference any “calculations”.
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