Lightweight aluminium double lateral tubed electric radiator.
Slimline vertical flat tubed aluminium oil filled electric radiator.
Electric flat column with curve top electric radiator.
Smooth fronted, curved faced steel electric radiator.
Timeless electric column radiator.
Horizontal round tube fluid‑filled electric towel radiator.
Horizontal round tube dry filled electric towel radiator.
Horizontal flat tube fluid‑filled electric towel radiator.
Horizontal tube on tube fluid‑filled electric towel radiator.
Asymmetric flat square tube electric towel radiator.
High‑quality panel only radiator.
Triple‑panel, triple‑convector radiator with no grilles.
Compact radiator designed for low‑height installations.
Reliable compact radiator for everyday heating needs.
Triple‑panel, triple‑convector radiator for high heat output.
Taller Vertex model offering increased heat output.
Vertical compact radiator for narrow wall spaces.
Radiators featuring horizontal linear detailing in a range of colours.
Low‑level radiator ideal for low‑height installations.
Vertical radiator featuring subtle linear detailing.
Triple‑panel, triple‑convector radiator for high heat output.
Sleek, smooth‑front horizontal radiators in a range of colours.
Smooth front triple‑panel, triple‑convector radiator for high heat output.
Sleek, smooth‑front vertical radiators in a range of colours.
Low‑level radiator ideal for under‑window or low‑height installations.
Flat‑front Concord radiator with a smooth, modern finish.
Slimline coloured radiator with flat square tube styling.
Vertical coloured radiator with flat square tubes.
Horizontal classic column radiator for heritage interiors.
Vertical column radiator with enhanced design in various colours.
Vertical multicolumn radiator range demonstrates the perfect combination of style and function.
Horizontal multicolumn radiator range demonstrates the perfect combination of style and function.
Curved front panel designer radiator.
Heavy‑duty lined‑front radiator for high‑traffic areas.
Robust flat‑front radiator built for demanding environments.
Corrosion‑resistant radiator ideal for harsh or humid conditions.
Advanced low‑surface‑temperature radiator offering enhanced safety and performance.
LST radiator with decorative lined‑front styling.
LST radiator with enhanced corrosion resistance.
Vertical LST radiator for restricted wall spaces.
Low‑surface‑temperature radiator for safe heating in sensitive settings.
Standard low‑surface‑temperature model with Deco front panel.
Grey column radiator with enhanced design.
Horizontal column radiator for traditional‑meets‑modern styling.
Vertical column radiator for efficient heating in tight spaces.
Vertical column grey concept radiator.
High‑quality compact radiator for reliable everyday heating.
Triple‑panel, triple‑convector radiator for high heat output.
Vertical compact radiator ideal for narrow walls.
Square flat tube horizontal radiator.
Slimline square flat tube vertical radiator.
Grey slimline square flat tube vertical radiator.
Square flat tube vertical radiator.
Grey square flat tube vertical radiator.
Horizontal lined‑panel radiator.
Grey horizontal lined‑panel radiator.
Vertical with lined‑panel radiator.
Grey vertical with lined‑panel radiator.
Flat‑front panel radiator.
Grey flat‑front panel radiator.
Vertical flat‑front panel radiator.
Vertical flat‑front panel grey radiator.
Vertical lined front panel.
Grey with vertical lined front panel.
High‑performance flat front radiator.
Modern column radiator with Softline’s smooth, rounded styling.
Horizontal column radiator with Softline’s signature smooth edges.
Vertical column radiator with Softline’s rounded aesthetic.
Vertical column grey concept radiator with enhanced design.
Compact panel radiator with rounded grilles and side panels.
Triple‑panel, triple‑convector radiator with rounded grilles and side panels.
Vertical compact radiator with rounded grilles and side panels for narrow spaces.
Flat‑front Concord radiator offering a sleek, smooth finish.
Slimline radiator with flat square tubes.
Slimline grey radiator with flat square tubes.
Vertical radiator with flat square tubes.
Vertical Concept version with refined styling.
Decorative lined‑front radiator with curved top grille and side panels.
Lined‑front grey radiator with curved top grille and side panels.
Vertical lined‑front grey radiator with curved top grille and side panels.
Vertical lined‑front grey radiator with curved top grille and side panels.
Flat‑front panel radiator with curved top grille and side panels.
Flat‑front designer panel radiator with curved top grille and side panels.
Vertical flat‑front radiator with curved top grille and side panels.
Vertical flat‑front Concept radiator with curved top grille and side panels.
Vertical lined front panel with curved top grille and side panels.
Grey with vertical lined front panel with curved top grille and side panels.
Durable towel rails in brushed or polish chrome, ideal for bathrooms.
High‑output vertical radiator for maximum performance in minimal space.
Stylish tubular towel rail offering strong heat output.
Traditional towel rail available in a range of colours.
Designer radiator with a distinctive contemporary profile.
Chrome‑finished flat square tube vertical radiator.
Heated rail with flat square tubes.
Chrome‑finished side‑connected flat square tube radiator.
Side‑connected flat square tube radiator for flexible installation.
Modern radiator with clean lines and architectural styling.
Eco‑focused radiator made with low-carbon emission XCarb steel
High‑quality panel only radiator.
Triple‑panel, triple‑convector radiator with no grilles.
Compact radiator designed for low‑height installations.
Reliable compact radiator for everyday heating needs.
Triple‑panel, triple‑convector radiator for high heat output.
Taller Vertex model offering increased heat output.
Vertical compact radiator for narrow wall spaces.
Radiators featuring horizontal linear detailing in a range of colours.
Low‑level radiator ideal for low‑height installations.
Vertical radiator featuring subtle linear detailing.
Triple‑panel, triple‑convector radiator for high heat output.
Sleek, smooth‑front horizontal radiators in a range of colours.
Sleek, smooth‑front vertical radiators in a range of colours.
Smooth front triple‑panel, triple‑convector radiator for high heat output.
Low‑level radiator ideal for under‑window or low‑height installations.
Vertical coloured radiator with flat square tubes.
Slimline coloured radiator with flat square tube styling.
Horizontal classic column radiator for heritage interiors.
Vertical column radiator with enhanced design in various colours.
Curved front panel designer radiator.
Traditional towel rail available in a range of colours.
Durable towel rails in brushed or polish chrome, ideal for bathrooms.
Stylish tubular towel rail offering strong heat output.
Heated rail with Concord styling for practical towel warming.
Designer radiator with a distinctive contemporary profile.
Side‑connected flat square tube radiator for flexible installation.
Chrome‑finished side‑connected flat square tube radiator.
High‑output vertical radiator for maximum performance in minimal space.
Modern radiator with clean lines and architectural styling.
Horizontal multicolumn radiator range demonstrates the perfect combination of style and function.
Vertical multicolumn radiator range demonstrates the perfect combination of style and function.
Traditional cast‑iron radiator offering long‑lasting, radiant heat.
Horizontal classic column radiator for heritage interiors.
Vertical column radiator with enhanced design in various colours.
Modern column radiator with Softline’s smooth, rounded styling.
Horizontal column radiator with Softline’s signature smooth edges.
Vertical column radiator with Softline’s rounded aesthetic.
Vertical column grey concept radiator with enhanced design.
Modern column radiator with a clean, contemporary finish.
Horizontal column radiator for traditional‑meets‑modern styling.
Vertical column radiator for efficient heating in tight spaces.
Vertical column grey concept radiator.
Low‑surface‑temperature radiator for safe heating in sensitive settings.
Standard low‑surface‑temperature model with Deco front panel.
Vertical low‑surface‑temperature radiator for restricted wall spaces.
Advanced low‑surface‑temperature radiator offering enhanced safety and performance.
LST radiator with decorative lined‑front styling.
LST radiator with enhanced corrosion resistance.
Stylish tubular towel rail offering strong heat output.
Vertical column radiator with enhanced design in various colours.
Vertical compact radiator for narrow wall spaces.
Vertical radiator featuring subtle linear detailing.
Chrome‑finished flat square tube vertical radiator.
Slimline coloured radiator with flat square tube styling.
Vertical coloured radiator with flat square tubes.
Vertical LST radiator for restricted wall spaces.
Sleek, smooth‑front vertical radiators in a range of colours.
Vertical column radiator with Softline’s rounded aesthetic.
Vertical column grey concept radiator with enhanced design.
Vertical compact radiator with rounded grilles and side panels for narrow spaces.
Vertical radiator with flat square tubes.
Vertical Concept version with refined styling.
Vertical lined‑front grey radiator with curved top grille and side panels.
Vertical flat‑front radiator with curved top grille and side panels.
Vertical flat‑front Concept radiator with curved top grille and side panels.
Curved front panel designer radiator.
Vertical compact radiator with upgraded styling.
Vertical column grey concept radiator with enhanced design.
High‑quality compact radiator for reliable everyday heating.
Vertical compact radiator ideal for narrow walls.
Square flat tube vertical radiator.
Grey square flat tube vertical radiator.
Vertical with lined‑panel radiator.
Grey vertical with lined‑panel radiator.
Vertical flat‑front panel radiator.
Vertical flat‑front panel grey radiator.
Grey column radiator with enhanced design.
Horizontal column radiator for traditional‑meets‑modern styling.
Vertical column radiator for efficient heating in tight spaces.
Vertical column grey concept radiator.
High‑quality compact radiator for reliable everyday heating.
Triple‑panel, triple‑convector radiator for high heat output.
Vertical compact radiator ideal for narrow walls.
Square flat tube horizontal radiator.
Slimline square flat tube vertical radiator.
Grey slimline square flat tube vertical radiator.
Square flat tube vertical radiator.
Grey square flat tube vertical radiator.
Horizontal lined‑panel radiator.
Grey horizontal lined‑panel radiator.
Vertical with lined‑panel radiator.
Grey vertical with lined‑panel radiator.
Flat‑front panel radiator.
Grey flat‑front panel radiator.
Vertical flat‑front panel radiator.
Vertical flat‑front panel grey radiator.
Vertical lined front panel.
Grey with vertical lined front panel.
High‑performance flat front radiator.
Modern column radiator with Softline’s smooth, rounded styling.
Horizontal column radiator with Softline’s signature smooth edges.
Vertical column radiator with Softline’s rounded aesthetic.
Vertical column grey concept radiator with enhanced design.
Compact panel radiator with rounded grilles and side panels.
Triple‑panel, triple‑convector radiator with rounded grilles and side panels.
Taller Compact model offering increased heat output.
Vertical compact radiator with rounded grilles and side panels for narrow spaces.
Flat‑front Concord radiator offering a sleek, smooth finish.
Slimline radiator with flat square tubes.
Slimline grey radiator with flat square tubes.
Vertical radiator with flat square tubes.
Vertical lined‑front grey radiator with curved top grille and side panels.
Vertical Concept version with refined styling.
Decorative lined‑front radiator with curved top grille and side panels.
Lined‑front grey radiator with curved top grille and side panels.
Vertical lined‑front grey radiator with curved top grille and side panels.
Flat‑front panel radiator with curved top grille and side panels.
Flat‑front designer panel radiator with curved top grille and side panels.
Vertical flat‑front radiator with curved top grille and side panels.
Vertical flat‑front Concept radiator with curved top grille and side panels.
Vertical lined front panel with curved top grille and side panels.
Grey with vertical lined front panel with curved top grille and side panels.

Calculate the ideal radiator size for your room and enjoy maximum comfort with the perfect heat output.
Selecting the right radiator size for your room is a crucial decision, and our Radiator Size Calculator is here to simplify the process. We understand that determining the appropriate size for your radiators can be challenging, so we’ve crafted a tool to guide you through it effortlessly.
Our Radiator Size Calculator streamlines the process of finding the ideal radiator dimensions. Radiator sizes can vary based on style and type, so it’s essential to check before making a purchase. Whether you’re eyeing electric radiators, bedroom radiators or kitchen radiators, our calculator ensures you make an informed decision tailored to your home.
In the UK, radiator sizes are measured in the metric system, requiring measurements in meters (m) or millimetres (mm). To accurately calculate the British Thermal Unit (BTU) output for a room, follow these steps:
Understanding the impact of window dimensions is crucial, especially considering the heat loss potential. Single-glazed windows, for instance, demand higher BTU to counteract heat loss.
At Stelrad, we offer the UK’s largest range of radiator sizes, ensuring our calculator assists you in making the right choice. Whether opting for standard-size radiators or exploring our range of designer radiators, we help you strike the ideal balance between style, heat output, and size for efficient heating.
Our radiators come in various shapes and sizes, serving different functions for various room types. Vertical radiators stand tall, providing a unique aesthetic, while horizontal radiators offer a broader profile for a distinct look. Bathroom radiators, including our towel rail radiators, not only deliver warmth but also serve a practical purpose with their specific shapes and sizes.
For those with limited space, our compact radiators present an ideal solution, tailored to smaller rooms and spaces. If you’re looking for a classic design or a more modern touch from our designer radiators range, your objective is to strike the perfect balance between style, heat output, and size to ensure efficient room heating.
Our commitment to providing a wide range of radiator shapes and sizes ensures that you have the flexibility to choose the one that complements your room’s aesthetics and meets your heating needs. Explore the possibilities, and let our radiators enhance both the warmth and visual appeal of your space.
If you have more questions or need guidance, visit our advice hub today. We’re always ready to assist you in making the right choice for your home.
Radiator Size Calculator UK
Our Radiator Size Calculator, along with the BTU Calculator, helps determine the dimensions suitable for your space. Ensure an energy-efficient choice by calculating heat output based on your room measurements.
At Stelrad, we offer a range of radiator sizes to suit diverse room requirements. “Standard” doesn’t mean one-size; it means a variety of options to match your unique needs. Explore sizes using our Radiator Size Calculator for full details.
Radiator sizes vary across models. Use our Radiator Size Calculator and BTU calculator to choose dimensions tailored to your room, avoiding a one-size-fits-all approach for optimal energy efficiency.
British Thermal Unit (BTU) measures the heat required to raise the temperature of one pound of water by one degree Fahrenheit. Our BTU calculator simplifies this process, helping you select the right radiator size based on your room’s characteristics.
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