Enter the width and height of the panel radiator that you have into the calculator below. Select the type from the dropdown menu (use the images at the bottom of the page to help you select the right type). The output will give you an estimate of the heat emitted from an existing radiator.
Single panel cast iron. 1340 Watts / m2
One steel panel with no convector fins. 1058 Watts / m2
One steel panel with convector fins. 1554 Watts / m2
Two parallel panels with no convector fins. 2271 Watts / m2
Two parallel panels with convector fins on one panel. 2354 Watts / m2
Two parallel panels with convector fins on both panels. 2983 Watts / m2