Is it possible to determine the size of radiators on the basis of dimensions of the room?

Determining the size of radiators on the basis of internal room volumes ("via cubic meters") was very popular in the past because it was a very simple calculation. Earlier designs of buildings allowed the use of this procedure, because the differences in thermal-technical properties of the buildings were significantly smaller than nowadays. Nowadays, when heat cost reductions (thermal insulation, passive houses, etc.) are the priority, such procedure cannot be used anymore. The reason is very simple - a significant inaccuracy. This can then lead to a wrong calculation - under / over-dimensioning of the heating system. The possible consequences of the wrong system calculation are the increase in investment costs and inefficient and uneconomical operation. Therefore, it is strongly recommended to process the calculation of heat losses, which serves as a basis for the size of new radiators.

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