If you insulate the house well enough, have some high quality south facing windows and have thermal mass then your solar hot water system should only need to heat your domestic hot water and like others have said, a mini split air source heat pump should take care of your heating needs on a cloudy winter day and you can use it as air conditioning if you need it, but with good insulation, proper roof over hangs and your house being built in to a hill side you should never need to cool your house in the summer, so you will end up with very little waste heat to heat your pool so more solar hot water panels would be the answer, at that point using the solar hot water panels to add heat to the house in the winter, to the concrete floor would be a good idea, allowing you to have fewer or smaller south facing windows.
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