Belsolar was founded in 1998 as an association of suppliers of solar energy systems. The members of Belsolar are specialized in systems for active thermal solar energy or solar boilers. Since 2010, Belsolar has been part of Climafed, the Belgian federation for climate technologies, which has been active in the heating market since 1973 and until recently was known as ATTB, the Association for Thermal Technologies in Belgium.