400mm High Curved Radiator for Bay Windows – Bespoke & Efficient

Our 400mm curved radiators offer the perfect balance between discreet design and strong heat output, making them one of the most popular choices for bay windows in UK homes.

A Versatile Height for Most Bay Windows

The 400mm height is ideal for:

• Standard bay windows

• Living rooms and dining rooms

• Homes needing efficient heating without bulky radiators

Its curved design allows warmth to flow evenly across the bay, eliminating cold areas near glazing.

Custom Made to Your Bay Window

Every 400mm curved radiator is made to measure, ensuring:
✔ A precise fit
✔ Improved efficiency
✔ A seamless appearance

We manufacture each unit to follow the exact curve of your wall.

Efficient Heat Output

The 400mm height provides excellent heat output for most bay window areas, especially when paired with the correct width and BTU requirement.

Not sure what output you need? Use our Curved Radiator BTU Calculator for guidance.

Key Features

• 400mm curved radiator for bay windows

• Made-to-measure construction

• Excellent balance of size and performance

• Suitable for most UK central heating systems

• Designed specifically for curved walls

Upgrade your bay window heating with a bespoke 400mm curved radiator.

Bay Window curved radiators available in a range of lengths. Single Panel Single Convector.

Huge range of lengths to choose from.

Heat Outputs

What's included

Brackets, Bleed Vent and End cap included FREE with ALL Radiators

Radiators 1000mm to 1600mm come with 2 brackets.

Radiators 1800mm to 3000mm come with 3 brackets.

Frequently Asked Questions – 400mm Curved Radiators

Is a 400mm curved radiator suitable for bay windows?

Yes, a 400mm curved radiator is one of the most popular and versatile choices for bay windows. This height fits comfortably beneath most standard bay window sills while providing strong, even heat distribution across the curved wall, helping to eliminate cold spots near glazing.

How much heat output does a 400mm curved radiator provide?

The heat output of a 400mm curved radiator depends on its width, depth, and your room’s heat requirements. When correctly sized, a 400mm curved radiator provides excellent heat output for most living rooms, dining rooms, and bedrooms with bay windows.
For best results, we recommend using a BTU calculator to determine the ideal size.

Is a 400mm curved radiator made to measure?

Yes. Every 400mm curved radiator we supply is made to measure to match the exact curve of your bay window. This ensures a seamless fit, improved efficiency, and a professional built-in appearance.

Are 400mm curved radiators more efficient than flat radiators?

In bay windows, yes. A 400mm curved radiator follows the shape of the wall, allowing heat to circulate evenly across the bay. This improves comfort and efficiency compared to flat radiators, which often leave cold areas and waste wall space.

Can a 400mm curved radiator heat a bay window on its own?

In most cases, a properly sized 400mm curved radiator can comfortably heat a bay window area on its own. For larger rooms or properties with high heat loss, a wider radiator or a taller model (such as 500mm or 600mm) may be recommended.

Will a 400mm curved radiator fit under my window sill?

A 400mm curved radiator is designed to fit beneath most standard bay window sills. However, it’s important to allow sufficient clearance from the floor and sill. We always recommend measuring carefully and allowing space for valves and airflow. If a 400mm radiator is too tall, we also make 300mm curved radiators.

Are 400mm curved radiators compatible with standard UK heating systems?

Yes. Our 400mm curved radiators are compatible with standard UK central heating systems and can be installed using conventional radiator valves. Professional installation is recommended for best performance.

Do you check my measurements before manufacturing?

Yes. We review all measurements before manufacturing to ensure accuracy and suitability for a curved radiator. This extra step helps avoid delays and ensures your 400mm curved radiator fits perfectly.

How long does it take to manufacture a 400mm curved radiator?

Because each 400mm curved radiator is made to measure, manufacturing times may vary. Typical lead times will be confirmed at the time of order, and delivery details are provided once production is complete.

Available Curved Radiator Heights

We offer bespoke curved radiators in multiple heights to suit different bay windows and heat requirements:

• 300mm curved radiators (low-profile)
• 400mm curved radiators (most popular)
• 500mm curved radiators (higher heat output)
• 600mm curved radiators (maximum performance)

All our radiators are especially made for you. Once ordered we will send you an email requesting a few simple measurements for your bay- just send these over to us and we'll get right onto making your radiator. As they are bespoke items they take around 2 weeks from us receiving your measurements to delivery. Simple!

Click here to learn how to measure up your bay in 3 easy steps