Panel Radiator Heat Output Calculator

At Cast Iron Radiators Ltd, we are frequently approached by customers looking to upgrade from steel panel radiators to traditional cast iron radiators. This growing trend is driven by several compelling reasons. Cast iron radiators offer a timeless, decorative aesthetic that complements period properties and traditional interiors far more effectively than the plain, utilitarian design of modern steel panel radiators. Beyond their visual appeal, there is a rising awareness of health considerations—studies suggest that homes fitted with steel panel radiators may have a higher incidence of respiratory issues such as asthma, partly due to the difficulty of thoroughly cleaning these radiators.

Step One: Select which existing panel radiators you have and measure them

If you are replacing your steel panel radiators for cast iron radiators, you should first work out what the heat output of the steel panel radiators you have and what you are therefore trying to replace. You can do this by using our steel panel heat output calculator at the bottom of the page. Firstly you should work out which steel panel radiators you have. The most common types are detailed in the below table:
 

Single Steel Panel Radiator	Single Steel Panel Radiator with Convector	Double Steel Panel Radiator
Double Steel Panel Radiator with Convector	Double Steel Panel Radiator with Double Convector	Triple Steel Panel Radiator with Convectors
Cast Iron Panel Radiators

Step two: Use our calculator to determine the Watts or BTU heat output required

Next room by room, enter in the size of each panel radiator and the type of radiator you have. The below calculator will tell you both the Watt output and the BTU output of each radiator and the room you are working in.

Rad	Width (CM)	Height (CM)	Radiator Type	Heat Output - Watts / BTUs at Delta 60
1	cm	cm	Select a radiator typeSingle steel panelSingle Panel with convectorDouble PanelDouble panel single convectorDouble Panel double convectorTriple Panel with convectorsCast iron panel	Watts - BTUs
2	cm	cm	Select a radiator typeSingle steel panelSingle Panel with convectorDouble PanelDouble panel single convectorDouble Panel double convectorTriple Panel with convectorsCast iron panel	Watts - BTUs
3	cm	cm	Select a radiator typeSingle steel panelSingle Panel with convectorDouble PanelDouble panel single convectorDouble Panel double convectorTriple Panel with convectorsCast iron panel	Watts - BTUs
4	cm	cm	Select a radiator typeSingle steel panelSingle Panel with convectorDouble PanelDouble panel single convectorDouble Panel double convectorTriple Panel with convectorsCast iron panel	Watts - BTUs
5	cm	cm	Select a radiator typeSingle steel panelSingle Panel with convectorDouble PanelDouble panel single convectorDouble Panel double convectorTriple Panel with convectorsCast iron panel	Watts - BTUs
Total : Watts / BTUs

 

Step three: Call us on 01723 321 000 to discuss your requirements

Now that you know the required heat output you need in your room to replace your steel panel radiators you are ready to talk through your requirements with one of our helpful staff. We have over 100 different cast iron radiator castings to choose from which will suit any decor or interior and we are able to finish your cast iron radiator at our North Yorkshire factory in any paint colour, hand polished or a whole range of other beautiful finishes.