Solar energy is ecologically the most acceptable energy available to man.
Energy of the sun is used for systems of heating expendable warm water and water for pools. It is also used for systems of solar heating by heat accumulation.

Nowdays the interest for usage of solar energy in central heating by heat accumulation has been growing once again due to the increasing prices of fossil fuels, as well as due to growing awareness of enviroment protection.

Modern equipment for solar heating – collectors of solar heat – is installed on the house roof. They contain pipes with heat transfer liquid that is heated by sunrays.

Solar systems of large capacity (hotels and industry) as well as smaller systems (housholds, etc.) are regulated to use non-toxic heat transfer liquid in order to protect health of people if a pipe is ruptured in heat alternator and mixing with water occurs.