To calculate the required radiator power, or required total power of the boiler, take into account the coefficients for building secondary isolation. If you have an object (house) with a thermal insulation and double glazed windows you can reduce the value to 20% and increase if the building without facades with poor insulation. Determining the required also depends on the area in which the property is located for which the calculation of the works, which should also be taken into account.
Size and height of the room to be entered as a decimal number with up to two decimal places, eg. 40,25.