What is a convector radiator?

If you are wondering what is a convector radiator and if you should invest in one or not, we are here to help. Convector radiators aren’t just focused on radiating heat outwards, but emitting heat all over the room they are installed in. This happens by sandwiching layers of fins in-between panels in different types of arrangements. If you want to go for heaters that will warm up medium to large rooms and keep them toasty in the colder winter months, we recommend convection radiators for your home. Here is our guide on what is a convector radiator and some specifics you need to know before purchasing.

What is a convector radiator’s advantages?

The main reason convector radiators have become so popular in modern homes is down to the many advantages and benefits these heaters provide in any room. They are efficient and very fast at heating up large rooms, as well as smaller and medium ones. You won’t be waiting around for your room to heat up if you have a convector radiator installed. They work by warming up the air and circulating hot water through a tube, the tube is surrounded by small fins that help to emit and create the heat. This results in a well-heated room, just make sure you keep the doors closed to keep the heat in.

Are there different types of convection radiators at Stelrad?

Yes, at Stelrad we have four main types of convection radiators, each with different amounts of panels and convection fins. Here you can find the different types of convection radiators…

What is a convector radiator: Single Panel Convection Radiators (K1)

Our single panel K1 radiators are useful for smaller rooms as they only have 1 radiator panel and 1 set of convection fins, meaning they won’t radiate as much heat as double panel radiators. Single panel convection fin radiators are affordable, dependable, and effective to use in most rooms in your home. By getting a single panel convection radiator, you will save on space and have a more compact option to tuck away. A single panel convection radiator is the most traditional convection radiator you will find in an average UK home. This type of radiator has one front panel which acts as the body of the radiator and one row of convector fins. If you look behind the radiator’s panel, you will be able to see the zig-zag convection fins made from metal. Hot water will heat the panels and fins, this then heats the air that will circulate up through the radiator.

What is a convector radiator: Double Panel Convection Radiator (K2)

Our double panel convection radiators at Stelrad are K2 or P+ models. The K2 double panel radiators are ideal for larger rooms in your home as they have two panels and two convection fins. K2 radiators have both front and rear panels, unlike single radiators that just have the front panel. At Stelrad, we have a range of designer radiators that are K2 models. Browse them to find something perfect for you. These K2 radiators will heat any room quickly and are guaranteed to keep you and your family warm all winter.

What is a convector radiator: Double Panel Plus Convection Radiators (P+)

You might be wondering what is a convector radiator in a double panel plus convection size, and this is our range of P+ double panel radiators. Our P+ radiators have two radiator panels and one set of convection fins. These radiators are built to last and usually come with a 10 year warranty. Shop our P+ radiators today and your order will be with you within 48 hours.

What is a convector radiator: Triple Panel Convection Radiator (K3)

K3 triple panel radiators are specifically designed for efficiency and they are some of the fastest most efficient radiators we offer at Stelrad. K3 means this type of radiator has three panels and three convection fins inside. K2 and K1 radiator models also have names that reflect how many panels and convection fins they have. The great thing about K3 triple panels is they are low energy and will save you on your bills. K3 convection radiators have benefits like lowering your carbon footprint due to the energy they will save you. It’s a win-win when you are warming up your home and helping the environment at the same time! You can find our K3 triple panel convection radiators in a range of styles, colours, and sizes.

Are convection radiators categorised into types?

At Stelrad, you can find our convection radiators categorised into types. Here you can see exactly how many fins and panels each type of radiator has:


  • P1 also known as Type 10, is a type of radiator with 1 radiator panel and no convection fins.
  • K1 also known as Type 11, is a type of radiator with 1 radiator panel and 1 set of convection fins.
  • P+ also known as Type 21, is a type of radiator with 2 radiator panels and 1 set of convection fins.
  • K2 also known as Type 22, is a type of radiator with 2 radiator panels and 2 sets of convection fins.
  • K3 also known as Type 33, is a type of radiator with 3 radiator panels and 3 sets of convection fins.

What is a convection radiator’s heat output?

It will be different for every radiator, depending on the type of radiator it is and the size. To find out exactly how much heat a certain room in your home needs, you can use our heat STAR calculation. You can also calculate the right size of radiators for you using our handy radiator size calculator, and this will depend on the room size, how often you will want to use it and some other factors.