Radiator Size Calculator V7.4

Smart radiator recommendation with single and two-radiator options.

Calculator Inputs

Room heat loss (W)

Flow temperature (C)

Heating water DT

Room temperature (C)

Brand / mode

Radiator type

Height filter

Show options

Design margin

Heat Loss–

Target Output–

Mean Water Temp–

Radiator DT–

Outputs are estimates based on manufacturer data and selected flow temperature.

Do not know the room heat loss? Use the room heat loss calculator first.