Free tools
Heating calculators
Quick estimates based on simplified coefficients, useful for a first conversation with a client. Full calculations live in the HeatAlgo app.
Heat loss calculator
Enter heated area, building type, insulation standard and climate zone. Get the estimated building heat demand in kW with a ±10% uncertainty band.
Result in seconds · No registration
Open calculatorHeat pump sizing calculator
Same 4 inputs, get a recommended heat-pump power range. Preliminary sizing, not a substitute for a design project.
Result in seconds · No registration
Open calculator