Retrofit Solar Thermal Systems: the Cost-Effective Choice

Solar thermal systems are, in general, the most cost-effective choice in solar home systems. Whether used to heat water or to heat the home, up-front costs are cheaper than PV and, because heating space and water uses a lot of energy, returns are faster. But among solar thermal systems, what is the most cost-effective choice? Surprisingly, retrofit systems take the cake in that regard. In an interview with CalFinder Solar, Mick Humphreys, founder of Apricus, pointed out that retrofit solar hot water systems are typically cheaper because they can be integrated into the existing system.

This makes sense. Solar hot water systems can usually take advantage of much of the existing equipment and plumbing. In fact, a new tank may not even be needed. A solar hot water system can be as cheap as $2,000 but can rise as high as $6,000. Much depends on your home’s existing system. Regardless, given that water heating is second only to space heating in home energy consumption, and given state and federal rebates, there is not much waiting for the cows to come home, so to speak. (more…)

Retrofit Solar Thermal Systems: the Cost-Effective Choice