Quote:
Originally Posted by SDMCF
That's a reasonable rule of thumb but as always "it depends". I just installed a GSHP and connected it into my existing heating system (radiators). I didn't change anything inside the house apart from connecting the GSHP into the central heating pipework. Everything works just like it did before, only cheaper.
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I think you need to give some details regarding your radiators. The reason I say this is that North American radiators are typically about 50 to 70 years behind the technology that is normal in your area.
Additionally, by going to more efficient radiators, which will lower the feed-temperature, the increase in COP is exponential. It is a mild exponential curve, but exponential nonetheless.
-AC