Base for appropriate boiler selection is a thermal balance of the heated area created according to thermal standards for buildings. While selecting boiler for heating multi buildings systems it is recommended to calculate thermal balance. During calculation it is also important to take into account heat loss in the transmission system of the building. For single-family house with rooms about 2,5m height we can easily calculate heat requirement depending on the level of house insulation:
:: For not insulated house with un-tight windows 140 – 160W/m2
:: For not insulated house with exchanged windows 120 -140 W/m2
:: For insulated house with exchanged windows 100 – 120 W/m2
So in case of not insulated house but with exchanged windows and with heated area of 160m2 we calculate:
160 m2 x 140 W/m2 = 22400 W = 22,4 kW
We should select 25kW boiler.