Solar water heating systems comprise of solar collectors and solar water tanks for storage. However, there are two types of solar water heating systems – active, which have circulating pumps and controls, and passive – which don’t have.
Solar Water Tanks – Most solar water heating systems require a perfectly-insulated storage tank. Solar water tanks feature an additional outlet and inlet connected to and from the collector. The solar water heater preheats water before entering the conventional water heater in two-tank systems. But in one-tank systems, the backup heater is combined with the solar storage in a tank. The solar water tanks are the critical components of solar thermal systems. These tanks allow the system to provide hot water at any time of day, whether the sun is shining or not, since the solar production doesn’t coincide with the peak periods of hot water demand, using in the morning and evening.