Natural gas is the main energy source in the building sector inAlgeria. The use of solar energy in this country, an abundantrenewable energy source, is currently very low. The total installedarea of domestic solar water heaters did not exceed 1000 m2 in2016 [1]. In order to reduce the fossil fuels consumption, a lawpromulgated in 1999 focuses mainly on thermal insulation of thebuilding envelope, greater use of efficient equipment and morefrequent use of active solar systems. The promotion of the solarsystems is now a priority in Algeria, particularly for sanitary hotwater production