So, discounted cash flow analysis does not work well for banking value assessments. The second largest element would be the solar field if industrial waste heat is not available. The size of the collecting field was enlarged to compensate for the thermal loss when cogenerating power with CPV and to compensate for system degradation and average mirror dirt. The deep thermal mass seasonal storage system is very low cost. 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.