How much energy can actually be saved depends on the nature of the exterior walls. Wedi has carried out scientific calculations on the basis of a sample bath (9.3 square meters of floor space with 2 exterior walls). Taking into account the U-value and identical boundary parameters, heat transmissions can be directly related to each other by means of differently structured masonry.
In the following example calculations, average energy costs of 0.15 €/kWh were expected (as of September 2023).