This calculation is approximate and cannot be used to determine the precise cost of a power and heating of a boiler.
Fuel prices are listed with VAT.
** ecological gas price is calculated without subscription fee
*** in a new - built house, the loss of the heating is around 0,5 – 0,6 W
a) Fuel costs depend on the loss of the heating of the building or area. The loss of the heating depends on many more factors, such as the quality and width of windows, the thermal resistance of ceilings and walls, the heating loss due to ventilation and heating of the hot water for domestic reasons. It is really hard to make a precise calculation of these losses that is why we are using an approximate coefficient of the loss of the heating. It is determined in a specific way, where
1 stands for bad thermal insulation – old building or old windows;
0,8 stands for satisfying insulation – old building, replaced windows, necessary places are heated;
0,75 – 0,6 stands for good insulation – new building or fully heated old building, though, there are some disadvantages – too wide windows, the loss of the heating due to ventilation or heating of the hot water for domestic reasons;
0,5 – 0,4 stands for good insulation with some advantages – small windows, few external walls, minimal loss of the heating due to ventilation or heating of the hot water for domestic reasons;
b) It might be necessary to adjust the calculation of the power of the boiler depending on the type of the boiler. Mostly, the adjustment is related to a type and need of the heating due to ventilation or the heating of the hot water for domestic reasons, also the thermal system type itself.
c) The cost of 1kW/h can show an approximate comparative difference between different types of fuel.