Your question
What boiler power and what heating cost do I put in the client's offer?
To make an offer look professional you need two numbers: how many kilowatts of heat the house loses and which fuel will cost the client less. TermoFlo works out both — without any complicated formulas.
Go to the heat-loss calculatorHow it works — three steps
- 1
What you enter
The house dimensions, the target indoor temperature, the design outdoor temperature, and the thermal conductivity of the walls, roof, floor and windows.
- 2
What you get
The house's heat loss in kilowatts — a guide for the boiler power — and a cost comparison of different fuels for that demand.
- 3
The decision you make
Pick a boiler of the right size and show the client which fuel will save them money.
A worked example with real numbers
A 120 m² house in a moderate climate
For a single-storey house of about 120 m² with average insulation, heat loss comes out at around 9 kW. That means a 10–12 kW boiler covers the demand with a little to spare. The fuel comparison right there shows whether gas, electricity or a heat pump is cheaper for the client.