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Kitchen Radiators: Sizing Around Units, Islands and Extensions
Finding the right radiator for a kitchen can be surprisingly difficult.
Unlike a bedroom or living room, kitchens are usually packed with units, worktops, appliances and doors. Add a kitchen island, bifold doors or a new extension and the amount of usable wall space can become very limited.
That means choosing a kitchen radiator isn't simply about finding one that looks good. You also need to consider heat output, available wall space, radiator size and the layout of the room.
Whether you're replacing an old radiator, designing a new kitchen, or heating a larger open-plan kitchen-diner, this guide explains how to choose and position a radiator without compromising your layout.
How Much Heat Does a Kitchen Need?
The first step is working out the heat output your kitchen actually requires.
Radiator output is commonly measured in BTUs or watts. The required output depends on more than just the floor area. Room dimensions, windows, insulation, external walls and the amount of glazing can all affect how much heat is needed.
This becomes particularly important if you've recently extended your kitchen.
A small kitchen that once had a standard radiator may now have a much larger floor area, a higher ceiling, or a full wall of glass. Simply replacing the old radiator with a similar-sized model could leave the extended space feeling cold.
Our free BTU Calculator is a useful starting point. Enter your room details to get an estimated heat requirement before choosing your radiator.
Kitchen radiator sizing tips
When calculating your heat requirement:
- Measure the current kitchen, not the original room before an extension.
- Include the full space if you have an open-plan kitchen-diner.
- Take large windows, bifold doors and other glazing into account.
- Consider the room's insulation and external walls.
- Don't rely solely on the size of your existing radiator.
Getting the output right first makes choosing the actual radiator much easier.
Where Should You Put a Radiator in a Kitchen?
Once you know how much heat you need, the next challenge is finding somewhere to put the radiator.
Kitchen layouts vary considerably, but there are several positions that work particularly well.
1. Under a Window
If you have an unobstructed section of wall beneath a kitchen window, this can be a practical location for a radiator.
It also makes good use of wall space that may otherwise be difficult to use because of the window.
However, check the proposed radiator dimensions carefully. Kitchen worktops, sinks and units can limit the available height, while curtains, blinds or furniture may also affect the installation.
2. Use a Vertical Radiator When Wall Space Is Limited
A vertical radiator for a kitchen can be an excellent solution when horizontal wall space is taken up by cabinets and appliances.
Instead of extending across a wall, a vertical radiator makes better use of height. This can be particularly useful in:
- Galley kitchens
- Kitchens with tall units
- Narrow spaces beside doors
- Kitchen-diners
- Extensions with limited uninterrupted wall space
Our Vertical Designer Radiators collection is worth exploring if you're working with a narrow section of wall.
The important thing is to select a model with enough heat output for the room. A vertical radiator isn't automatically better or worse than a horizontal radiator the output and sizing are what matter.
3. Use a Horizontal Radiator Where You Have More Wall Space
If your kitchen has a reasonable stretch of open wall, a horizontal radiator can be the simpler choice.
This works particularly well in larger kitchen-diners where the radiator can sit away from the main kitchen run, perhaps on a dining or living-room wall.
Our Horizontal Designer Radiators offer a range of styles for modern interiors.
4. Consider Column Radiators for Traditional Kitchens
If your kitchen has a Shaker, farmhouse or more traditional design, column radiators can work particularly well.
Their deeper profile and traditional styling can make them feel like part of the interior rather than something that needs to be hidden.
Our Column Radiators include different depths and configurations, including 2 Column Radiators and 3 Column Radiators.
They're particularly suited to kitchens where the dining area provides a little more wall space for a feature radiator.
Alma Single Oval Vertical Designer Radiator 1600mm x 360mm White
In stock
- 🔥 BTU Output: 2156
- ⚡ Watt Output: 632
- 🛡️ Warranty: 5 Years
Aura 2 Column Horizontal Radiator 600mm x 1010mm Raw Metal
In stock
- 🔥 BTU Output: 3273
- ⚡ Watt Output: 960
- 🛡️ Warranty: 5 Years
Aura 3 Column Horizontal Radiator 600mm x 695mm Anthracite
In stock
- 🔥 BTU Output: 3060
- ⚡ Watt Output: 896
- 🛡️ Warranty: 5 Years
TRH Stafford Horizontal Double Radiator 600mm x 612mm Anthracite
In stock
- 🔥 BTU Output: 1487
- ⚡ Watt Output: 436
- 🛡️ Warranty: 10 Years
What About Radiators in Kitchens With Islands?
Kitchen islands can make radiator positioning more complicated.
The island usually occupies the centre of the room, while the surrounding walls are taken up by units, appliances and worktops. In most conventional installations, a wall-mounted radiator will therefore need to be positioned around the perimeter of the room.
The key is to think about heat output and heat distribution together.
If the radiator is positioned a reasonable distance from the island, make sure its output is sufficient for the entire space rather than choosing a smaller model simply because it fits a particular gap.
For larger kitchen extensions, it may also make sense to use more than one radiator rather than relying on a single large radiator.
If you're considering underfloor heating, this can also be combined with radiators depending on the heating system and design of the room. The best option will depend on the property and installation.
Kitchen Extensions and Large Areas of Glass
Modern kitchen extensions often look fantastic, but large areas of glazing can make heating more challenging.
Bifold doors, sliding doors, roof lanterns and large windows can create considerably more glazed area than you'd find in a traditional kitchen.
This is why a radiator for a kitchen extension should be sized according to the new room rather than based on the radiator that was previously installed.
If you've removed a wall to create a large open-plan kitchen, dining and living area, calculate the heat requirement for the combined space.
A good rule is simple: don't guess based on the old radiator. Recalculate the room.
Our BTU Calculator can help you establish an estimated heat requirement before you start comparing radiator sizes.
Alma Double Oval Vertical Designer Radiator 1600mm x 360mm White
In stock
- 🔥 BTU Output: 2798
- ⚡ Watt Output: 820
- 🛡️ Warranty: 5 Years
Aura 2 Column Vertical Radiator 1800mm x 425mm Raw Metal
In stock
- 🔥 BTU Output: 3444
- ⚡ Watt Output: 1009
- 🛡️ Warranty: 5 Years
Luna Single Flat Vertical Designer Radiator 1600mm x 376mm White
In stock
- 🔥 BTU Output: 2001
- ⚡ Watt Output: 586
- 🛡️ Warranty: 5 Years
TRH Keyworth Vertical Radiator 1800mm x 450mm Matt Black
In stock
- 🔥 BTU Output: 3685
- ⚡ Watt Output: 1080
- 🛡️ Warranty: 5 Years
How to Choose the Best Radiator for Your Kitchen
Once you've calculated the required heat output, consider the practical limitations of the room.
Think about available wall space.
Measure the area where the radiator will actually go. Don't forget to allow for surrounding units, doors, appliances, and other features.
Consider radiator shape
A vertical kitchen radiator is often useful where width is limited, while a horizontal model may be more suitable where you have a longer section of wall.
Check the heat output.
Don't choose a radiator purely because it fits. Make sure its stated output is suitable for your calculated room requirement.
Think about the overall design.
Your radiator will be visible, so consider how its finish and style work with the kitchen.
Modern kitchens can suit designer, anthracite or black radiators, while traditional kitchens often work particularly well with column-style designs.
Don't forget the accessories.
Radiator valves and pipework are small details, but they can make a noticeable difference to the finished installation.
Our Radiator Valves and Radiator Pipe Sleeves can help create a more coordinated finish.
Popular Kitchen Radiator Options
There isn't one single “best radiator for a kitchen”. The right choice depends on the room and your available space.
For narrow walls
Consider a vertical designer radiator where width is restricted.
For larger open-plan kitchens
A horizontal radiator or multiple radiators may provide the flexibility needed for a larger space.
For traditional kitchens
A 2-column or 3-column radiator can add character while providing useful heat output.
For very small kitchens
Look at compact options designed for smaller rooms. Our Small Room Radiators collection is a useful place to start.
Aura 2 Column Horizontal Radiator 600mm x 1190mm White
In stock
- 🔥 BTU Output: 3870
- ⚡ Watt Output: 1135
- 🛡️ Warranty: 5 Years
Aura 3 Column Horizontal Radiator 600mm x 605mm Raw Metal
In stock
- 🔥 BTU Output: 2633
- ⚡ Watt Output: 778
- 🛡️ Warranty: 5 Years
Luna Single Flat Vertical Designer Radiator 1800mm x 376mm Anthracite
In stock
- 🔥 BTU Output: 2293
- ⚡ Watt Output: 672
- 🛡️ Warranty: 5 Years
TRH Slimline Double Vertical Radiator 1800mm x 420mm Textured White
Out of stock
- 🔥 BTU Output: 3826
- ⚡ Watt Output: 1122
- 🛡️ Warranty: 5 Years
A Simple Approach to Kitchen Radiator Sizing
If you're unsure where to begin, follow these steps:
- Measure the room.
Record the length, width, and height. - Include the whole space.
For an open-plan kitchen-diner, calculate the combined area. - Consider the glazing.
Large windows and bifold doors can have a significant effect on heat requirements. - Calculate the BTU requirement.
Use our free BTU Calculator to get an estimated target. - Measure your available wall space.
Check both width and height. - Choose the radiator style.
Decide whether a vertical, horizontal, column, or designer radiator suits the layout. - Compare radiator output.
Make sure the selected model provides the required heat output.
This approach is much more reliable than choosing a radiator simply because it's the same size as your old one.
Frequently Asked Questions
What size radiator do I need for a kitchen?
The required radiator size depends on the room's heat-loss requirements rather than floor area alone. Room dimensions, insulation, windows, and glazing all affect the calculation. Use a BTU calculator to estimate the required output before choosing a radiator.
What is the best radiator for a kitchen with limited wall space?
A vertical radiator is often a good option because it uses wall height rather than taking up a large amount of horizontal space. It's particularly useful between kitchen units, appliances and doorways.
Can I put a radiator under kitchen units?
Radiator placement needs to take account of the radiator design, surrounding units and manufacturer's installation requirements. Don't assume a radiator can simply be fitted wherever there is space beneath or beside kitchen cabinetry. Check the specific product installation guidance before fitting.
How do I heat a kitchen extension?
Start by calculating the heat requirement for the entire extended space. Large windows, bifold doors and other glazing can increase heat loss. Depending on the size and layout, you may need one or more appropriately sized radiators.
Do kitchen islands affect radiator sizing?
The island doesn't directly change the radiator's heat output requirement, but it can affect where the radiator can be positioned and how heat is distributed around the room. Larger island kitchens should therefore be planned carefully.
Is a vertical radiator suitable for a kitchen?
Yes. A vertical radiator can be an excellent choice when horizontal wall space is limited. As with any radiator, make sure its heat output is suitable for the room.
Should a kitchen-diner be treated as one room for radiator sizing?
Generally, an open-plan kitchen and dining area should be assessed as the combined heated space rather than simply sizing the radiator for the original kitchen footprint.
Are column radiators suitable for kitchens?
Yes. Column radiators can work particularly well in traditional and modern kitchens, provided the selected model has the required heat output, and there is enough space for its depth and installation requirements.
How can I make my kitchen radiator look better?
Choose a radiator that complements the kitchen's style and coordinate the radiator valves and pipe sleeves with its finish. A well-positioned radiator can become part of the design rather than something that needs to be hidden.
Find the Right Kitchen Radiator at The Radiator Hub
Choosing a radiator for a kitchen is about balancing heat output, available space, and design.
Start with the room's heat requirement, then work backwards from the space you actually have available. If units and appliances have taken most of the wall space, consider going vertical. If you're heating a large kitchen extension or open-plan kitchen-diner, calculate the whole space rather than relying on the old radiator.
Explore our Kitchen Radiators collection, or browse our Vertical Designer Radiators, Horizontal Designer Radiators and Column Radiators to find a style that works with your layout.
And before ordering, use the BTU Calculator to get a better idea of the heat output your kitchen needs.
