Of course, you could just convert to solar hot water radiant underfloor heating with a back-up wood boiler. For the present, the solar hot water should cover most of the three seasons, and in the future, the wood boiler would provide winter heat. My house has just solar hot water with back-up wood boiler. It was designed with this in mind, so has high thermal mass and 1,000+ gallon water tank to keep house warm, plus underhouse heat sink that stores heat all summer for use in fall and winter.
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