Have you seen the solar tie-in systems for the altherma?
I can I deal with the low temperature water for the 2 offices.
The house is currently on steam radiators. I think I will install very closely spaced 4" or so on the first floor since I have access from the basement. The second floor of the house will probably get the low water Rental Radiators I used in the second office.
I believe I will be able to then heat all 3 buildings off low temperature water. We rarely get more then 15 days a year when it 5 degrees F or lower a year. I'm ok with not having an efficient system on those days. The other attraction to the Altherma system is that they seem to offer a chiller that works off the hot water loop. To tie this whole project back to the subject title. I want to try and get some sort of refrigerator running off my heat-pump.
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