The total system cost could be much lower with close attention to details and the economy of scale. Larger systems are much more efficient and lower cost. System temperature is also a cost variable, higher temperatures are lower cost because of transport energy densities and the size of home heat exchangers. A low delta temperature between the surface of CPV and the heated water will be important. New home construction would require much less additional energy cost than existing homes.
District heating is a metered energy source, just like gas and electricity.
The incentives for home energy efficiency is not diminished. This is not free energy. It is locally available energy. System value would be the weighted average value of the energy well into the 21st century. Lets see how it seems to match alternatives.