Today (Saturday November 20th) was the first sunny day in a while. While cleaning up the breakfast dishes I was not surprised to hear the solar pump start. When I checked I found that my solar tank was down to 20 degrees C, the solar collectors were at 29 degrees C and the outside temperature was minus 17 degrees C. What did surprise me was that when I left the house to run some errands (around 10:40 AM) I found the collectors were still partially covered in snow!
This mean that my collectors managed to get a 45 degree C differential to the ambient temperature even while partially obscured. How great is that?