I have been working with thermal for a long time. I imported evacs from China. A good product. But unless you can lump together enough cash for at least a 20' container (60+ units), you cannot get up to bat. Most people today just use PV because the PV energy level use is much higher (Electricity). And over production can get net metered in some states, so there is no maxing out storage, etc..
I agree it is a fabulous source of energy. It just is not a very good business case unless you have already achieved size (Business size) and can get into commercial systems, and have no problem bringing over containers (Goes to economies to scale pricing). Additionally you never have leaking pipes with electricity. Solar thermal is a plumbing project, except for hot air panels.
Freezing climates additional issues, etc..
Best of luck....
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william fitch
Owner
www.WeAreSolar.com------------------------------