How do we calculate?
Heat load = area × heat demand per m² for the zone and insulation × (ceiling height ÷ 2.7). The boiler is selected from standard outputs according to the larger of the heat load + 10% and the hot water demand (1 bathroom 24 kW, 2 bathrooms 28 kW, 3+ bathrooms 35 kW).
Let us turn your calculation into a bill of materials
Send us the list from the calculator; we will quote flanges, elbows, tees, reducers, pipes and valves in a single offer, with EN 10204 3.1 material certificates.
This calculator is used in these sectors: Building services (HVAC & plumbing). All calculators →
Results are for preliminary selection and do not replace engineering design. Ask our technical team for the final selection.
