Open-loop systems are fine for light use in clean water. For everyone else, closed-loop systems offer better protection, longer life, and fewer nightmares when something inevitably goes wrong.

While previously, open water systems were the norm, today, plumbing codes require water expansion tanks on closed water systems. If you have a tankless water heater, you may not need an expansion ...

The closed-loop system consists of a 15%-efficient PV module with several layers, a water tank with a capacity of 150 L, water pipes, and a circulation pump.