What are radiator panels and convection fins?

A radiator is made up of panels, the flat surfaces at the front and back of the radiator and convection fins which sit in between the panels.  

Radiators may have one or two panels and then one or two rows of thin zig zagging metal layers depending on the size and heat output of the radiator. The panel is the outside facing areas they are filled with fluid such as water or oil.  

The convection fins are the zig zagging layer of metal fins behind the radiator, they add a considerable amount of surface area for your metal tank, the more surface area the more heat that is pulled away from the radiator by air currents. 


  • K1 also known as Type 11, is a type of radiator with 1 radiator panel and 1 set of convection fins. 
  • K1 radiators consist of a single panel and a single heating convector, giving them a slim profile with a lower heating output. They are suitable for small rooms and space restricted areas such as hallways. 


  • K2 also known as Type 22, is a type of radiator with 2 radiator panels and 2 sets of convection fins. 
  • K2 Radiators are ideal for homes where plenty of space is available. Consisting of two heating convectors sandwiched between two panels, K2 radiators offer high levels of heating, making them the perfect choice for large rooms or halls. 

At Direct Heating Supplies we have a large range of radiators available for you to purchase. You can view our radiators here and when you purchase today you are guaranteed excellent customer service and great prices. 

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