Room heating in the bathroom: Radiators are used for space heating. This is determined by the size of the radiators or by the flow temperature. In addition to the design type, the heat output of a radiator therefore depends largely on its size and temperature. As a general rule, the larger the radiator, the lower the required flow temperature can be. Flow temperatures can range between 40°C and 75°C. Whether the radiator is correctly matched to your heating system can only be verified by means of a calculation in accordance with DIN EN 12831, “Method for the Calculation of the Design Heat Load,” or DIN EN 12828, “Heating Systems in Buildings.” To give you an indication of whether the radiators are suitable for the heating system, you can measure the room temperatures. According to DIN EN 12831, the standard indoor temperature in the bathroom should be 24°C. For energy-saving reasons, however, the German Environment Agency states a value of 20°C. Federal Environment Agency
