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

Same 4 inputs, get a recommended heat-pump power range. Preliminary sizing, not a substitute for a design project.

Result in seconds · No registration