Type 11, 21 & 22 Radiators - What's The Difference?
Updated: Jun 17
The difference between type 11, 21 and 22 radiators is important to know to ensure you're buying the correct radiator to heat your room properly.
Type 11, Type 21, and Type 22 are all different configurations of central heating radiators, distinguished by the number of panels and fins they possess. The "Type XX" designation typically describes the number of panels and fins within the radiator.
Before going into the differences between Type 11, 21 and 22 radiators, it is important to also know what we mean when we talk about convector radiators and convection heating.
What is a Convector Radiator & Convection Heating?
Convection heating is the indirect transfer of heat to an area, via the movement of liquid or gas – which in the case of home heating relies on the movement of air. Warm air rises and displaces the cold air in the room down towards the radiator. This cold air is then heated, which then rises repeating the cycle.
Convector radiators are any radiator that heats a room by this method of convection - achieved by 'sandwiching' layers of fins between panels in various arrangements.
These types of radiators heat these fins which then heats the body of air within the radiator. This warm air then escapes through vents at the top of the radiator itself, heating the room in the process.
What is a Type 11 Radiator?
This radiator has one panel and one set of fins and is the simplest configuration.
The single panel allows for a relatively slim profile, making it suitable for spaces where wall space is limited.
While it may be less powerful in terms of heat output compared to radiators with more panels and fins, it's often chosen for its space-saving design.
What is a Type 21 Radiator?
Type 21 radiators feature one set of fins set between two panels.
The extra panel increases the heat output compared to Type 11 radiators, making it more suitable for larger rooms or rooms with greater heat loss.
It still maintains a relatively slim profile compared to radiators with more panels and fins.
What is a Type 22 Radiator?
This radiator has two panels and two sets of fins.
With the additional set of fins, Type 22 radiators offer even greater heat output compared to Type 21 radiators.
They are suitable for larger rooms or spaces where more heat is required, but they are bulkier compared to Type 11 and Type 21 radiators.
The choice between these types of radiators depends on factors such as the size of the room, the level of insulation, and the desired heat output. Type 11 radiators are often preferred in smaller spaces or where a sleeker design is desired, while Type 21 and Type 22 radiators are usually chosen for larger rooms or areas with greater heating requirements.
