Ok so if you can't heat the place with the solar thermal system now, what do you hope to see happen? Heat is heat. The heat pump is going to make up the difference no matter which what way or do how you go about it. Rig and reroute away if you feel froggy. Put in enough capacity and everything will be fine.
Trying to freeze a cistern or cesspool is almost a better way to do what you desire than to try to get reliability out of the sun.
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