What is NOT a method by which the boiler tank in a hydronic heating system is heated?

In hydronic heating systems, various methods are utilized to heat the boiler tank, with each option providing a different energy source. The option of using solar power cells is not a conventional method for heating the boiler tank.

Typically, hydronic systems use methods such as electric coils, natural gas, or propane burners, which effectively generate heat to warm the water in the boiler tank. These methods are widely used due to their efficiency and ability to provide a consistent and controllable heat source.

Solar power cells, on the other hand, generate electricity from sunlight and are not specifically designed to directly heat the boiler tank in typical hydronic heating applications. While solar thermal systems can be part of a broader heating strategy by generating hot water, the method of heating directly through solar power cells does not fit within the standard processes used in most hydronic heating systems.