Radiators are installed in every room you want to heat. The approximate heating power needed is about 50W per cubic meter. The most common radiators are made of aluminium or steel. They should be rationally installed, according to the type of room (for example below the window or attached to a wall facing externally, in order to minimize the negative influence of the cold on windows and walls). Aluminium radiators contain less water, higher heat transfer and they are lighter. Steel panel radiators have similar qualities, but with a more affordable price. However, they are more prone to corrosion. Panel radiators have very good qualities: high efficiency, attractive price, resistance to high pressure and long life.