These companies are going out of business right and left.
Anybody want to take bets on whether the company will be around in 25 years to honor its warranty?
Or five years for that matter.
As a system, it provided 100% hot water from March 1st to Nov 1st each year. I had to go to "pre-heat" mode Nov 1st to Feb 28th where the warm water from the roof is boosted to preferred temperature by the natural gas water heater.
The natural gas prices never reached a level that would have paid back the investment vs staying with the old natural gas only water heater.
I removed the inoperative system from the roof when replacing the roof. The tank went to the dump at my expense. The quartz heating panels were picked up by a local solar contractor who still had a few other victims of the same vendor who had a potential need in the future.