Is there a back-up for the solar water heating systems?
Yes, solar water heating systems have a back-up source that is either gas or electric. In the gas option, a gas tank is plumbed in line with the solar storage tank and will provide the additional energy as needed. In the electric option, an electric element in the solar tank will provide the additional energy as needed. The back-up heat source will typically only need to work 25% of the time of a standard water heater.
