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Convector Radiators: An Essential Guide (and a Sandwich Comparison)

"What is a convector radiator?" you ask. "It's like a sandwich," I say, seemingly unhelpfully. But I promise it is. Though the short answer is: any radiator with a layer of metal fins attached to it".

What is a Convector Radiator?

The longer-short answer is: "any radiator which is built to focus on convection heat rather than simply letting the heat radiate outwards. Achieved by - 'sandwiching' - layers of fins between panels in various arrangements"

BUT if you're buying one, or thinking of buying one (which is a good idea), then keep reading because you'll need to know a bit more than that...

Flat Panel Radiators: The Beginning

this is a single panel radiator

Every radiator is essentially a hollow conductive tank that's fed water from one side and drains from the other side. Once you click your central heating on, they heat up from the inside and 'radiate' that heat outwards into your home.

Flat panel radiators, also known as Type 10 and P1 radiators, are your basic rectangular metal tank. Likely a couple inches thick and a metre or so in length. They're skinny, hence the 'flat' name, and they're the simplest form a modern radiator can take - from which all other radiator designs build upon. They still USE convection to heat, but they're not strictly 'convection radiators'. More on that below.

But 'simple' isn't a bad thing, they're very popular as a slimline solution to heating a room. So if you're after something slim, maybe consider a flat panel. But now, on to convector radiators...

Convector Radiators: Basically Flat Panels with Fins

single, double, and double convector

So to answer the question of "what is a convector radiator?", simply take 1 flat-panel radiator and apply a generous layer of metal radiator fins. Heat evenly until piping hot. The result is a toasty convector radiator.

By bolting a zig-zagging layer of metal fins behind the radiator, those clever engineers have added a considerable amount of surface area to your metal tank. And more surface area means more heat is pulled away from the radiator by air currents. How? Not with fans or anything like that, but through convection heating...

What is Convection Heating?

diagram of convection heating

Since gaps between the radiator fins are purposely vertical, and this cleverly-compact-yet-wide surface area is contained between the wall and the panel(s) of your radiator, this means heat can only travel upwards, with the cold air that's fallen to the bottom of the room being drawn up into the bottom of the radiator - air currents created by nothing more than airflow caused by heat rising. Science!

All Radiators Convect, but Not All Radiators Are Convection Radiators

All radiators heat the cool air at the bottom of the room, which rises upwards as heat to create a constant, rotating flow of cool air going in and warm air coming out. But, not all radiators are called 'convector radiators'. That's because radiators just let convection happen, whereas convection radiators encourage it.

Convection Radiators vs Radiators

So as mentioned above, all radiators heat using convection, and they also 'radiate' that heat sideways. Which is fine. Convector radiators do that too. And if you like to sit right next to the radiator then you'll feel the benefit. But, it's less effective for evenly heating larger rooms. Convection radiators use their sandwich-shape design to better funnel rising air as it heats it, constantly channelling it upwards to keep a constant rotation going.

Put as simply as possible: convector radiators spread their heat better across larger spaces.

What are the Different Types of Convector Radiator?

different types of convector radiator

Note: The below list of convector types assumes a similar width and height throughout. Because obviously, in theory, a single panel convector radiator the size of the entire wall would heat better than a double panel the size of an A4 piece of paper, but we're keeping the width and height the same, and simply changing the amount of panels, convector fins, and overall depth.

Single Panel Convector Radiators (Type 11) Explained

The single panel convector radiator, AKA a 'K1' or 'Type 11' radiator. Not to be confused with a regular 'single panel radiator Type 10 radiator' because this is a single panel radiator with convector fins bolted to the back. The appeal of the single panel is the fact that it provides far more BTU output than a similarly sized normal radiator. It's also thicker than a normal radiator, but the thicker profile is a nice tradeoff for the BTU increase.

If you're looking to heat a relatively small room quickly then they're ideal. You can also get them in fairly long sizes too, making them a good choice for hallways and corridoors to strike a balance between size and heat output.

Double Panel Plus Convector Radiators (Type 21) Explained

The double panel plus convector radiator, AKA a 'P+' or 'Type 21' radiator. It's literally a single panel radiator with a second panel added at the back; sandwiching the single layer of convector fins between the two panels. Though the fins are only directly connected to a single panel. This results in a much thicker radiator than the single panel counterpart, but of course the BTU is increased substantially.

This configuration of convector radiator is still relatively slim, and can comfortably fit in even small rooms.

Double Panel Convection Radiators (Type 22) Explained

The double panel convector radiator, AKA the 'K2' or 'Type 22' radiator. Two layers of convector fins sandwiched between two single panels. Each panel has its own set of fins for a whole lot of surface area and a whole lot of heat.

Ideal for heating medium to large rooms. They're generally quite thick, but relative to the heat output they provide they're saving you a lot of room in terms of width and height.

Double-Panel Double Convection Radiators (Type 33) Explained

Double panel double convection radiators. 3 layers of convective fins lovingly mounted between 3 radiator panels. It's essentially a double panel convection radiator with a single panel Type 11 added to it. If you've been paying attention you know all about this radiator already. It's far thicker than your usual radiator, and it's far, far more powerful. "What is a convector radiator?" Well there's no better example than this.

Simply ideal for any room you can find space for it in.

How Can I Choose the Best Convector Radiator - Every Single Time, For Any Room?

btu calculator button

We've answered the "what is a convector radiator?" question and now you're suitably in awe of the way convector radiators manipulate air currents. But for those who want to take it one step further and enjoy living in a home with one of these marvellous radiators - there's the question of how to choose one.

That's easy: use our BTU calculator to find the perfect convector radiator for you.

You can also know exactly how to choose a great radiator with our essential buying guide.

 


We hope you found this guide useful in helping you answer the question of "what is a convector radiator?". If you have any further questions, or some feedback to help us serve future customers even better, please comment on this article or give us an email at help@onlyradiators.co.uk. For an immediate response, please use our phone number - visible at the top of the website - and our customer service staff will be ready to assist.

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