Above, you claimed that they don't work when the temps hit 0C. Now you tell us a story about them not working at -14C. That's a fairly big difference. Our pumps

Above, you claimed that they don't work when the temps hit 0C. Now you tell us a story about them not working at -14C. That's a fairly big difference. Our pumps (mitsubishi hyperheats) struggle a little at 5F (-15C) but they do not stop working, and that's in an old house with terrible insulation. > Finland loves their steam/hydronic heat, which I will guarantee isn't being run off of heat pumps. In my case, the steam is being generated by the 240V electric steam generator that takes power from my 7kW ground mount solar array.