The ENSOL solar collector is - a flat plate collector with an absorber in the form of a split harp, made entirely of copper, designed for vertical mounting. The solar collector is designed to convert solar radiation energy into useful thermal energy used to prepare domestic hot water, heat swimming pool water or to support a heat source in a heating system. Heat losses are minimized by using bottom and side insulation. Specially designed mounting kits, made of aluminum and stainless steel, are used for trouble-free and secure attachment of collectors to the roof structure with different slope angles.