Estimate radiator length from room volume, a preliminary heat-load coefficient and catalog watts per meter.
Results are for information and preliminary estimation. For critical technical work, manufacturer data, local codes and qualified professional review take precedence.
Heat load ≈ room volume × volumetric coefficient. Radiator length = heat load / catalog W per meter. Water temperature, ΔT, insulation and glazing affect the result.
Example: A 25 m² room with a 2.7 m ceiling can need more panel area in a low-temperature heating system.
HVAC capacity depends on more than floor area. Volume, solar gain, insulation, glazing, occupants and equipment loads all matter; critical selections require a proper heat-load assessment.
Yes; lower water temperatures reduce panel output.
Use the selected radiator manufacturer's catalog value at the actual design ΔT.
What AC capacity does my room need?
→How much electricity and money does an AC use per day or month?
→How many kW or tons of cooling is a BTU/h rating?
→How much airflow does a room need in m³/h?
→Tell us if a calculation is unclear, incomplete or appears incorrect.