A solar home heating system uses the solar evacuated tube collectors to absorb the energy from the sun. This energy is transferred to a storage tank. The stored heat is integrated with the existing heating system to supply heat. Generally, a large size 119 gallon storage tank can be used to store more energy. It can be used to supply heat when the sun doesn’t shine especially during the evening. https://www.solartubs.com/solar-home-heating.html