Solar h2o heating systems contain a solar collector that faces the sun and either heats drinking water instantly or heats a "Functioning fluid" that, consequently, is accustomed to heat h2o. To find out more on setting up a solar drinking water heating system, please see the California Solar Initiative (CSI). https://www.americanarraysolar.com/how-do-the-solar-installers-fresno-decide-which-solar-panels-to-install/