I have had one of their solar pool heater systems for six years. When it works it is great. But mine breaks down at least once a year. A bad sensor was installed on the roof which caused the system to toggle on and off far too much. That overuse broke other parts but it wasn't until about the third or fourth incident that a repair guy checked the roof. Since then the sensor that measures the temp of water returning from the pool had failed. My experience may be unlucky, but it certainly hasn't been the "no-maintenance" system the sales guy promised.