Curved Bay Window Radiator - Frequently Asked Questions
Everything you need to know about sizing, ordering, fitting and caring for your bespoke curved radiator. Can't find your answer? Call us on 0208 432 4782 and we'll help.
📐 Sizing and Measuring
How do I measure my bay window for a curved radiator?
You need three measurements:
- Total bay wall length — measure from corner to corner along the curved wall. Subtract 300mm from this figure to allow clearance at each end. This is your maximum radiator length.
- Available height — measure from the floor to the underside of your window sill. This determines which height (300mm, 400mm, 500mm or 600mm) suits your space.
- Floor to top of radiator — where you want the top of the radiator to sit.
For the curvature, full step-by-step instructions with diagrams are on our How to Measure page.
Which height radiator is right for my bay window?
- 300mm — low-profile, ideal for rooms with restricted wall height or very low window sills
- 400mm — our most popular height, suits the majority of Victorian and Edwardian bay windows
- 500mm — recommended for larger rooms, colder homes, or bays that face north
- 600mm — maximum heat output, ideal for large bays or period properties that are difficult to heat
Not sure? Contact us with your room size and bay dimensions and we'll advise.
Do you make radiators to any curve, or are there fixed shapes?
Every radiator is manufactured to your specific bay measurements — there are no fixed curved shapes. After you place your order, we email you to request your exact bay wall measurement and build the radiator to fit your space precisely.
Heights are available in four standard options: 300mm, 400mm, 500mm and 600mm.
🛒 Ordering & Delivery
What happens after I place my order?
Here's exactly what to expect:
- Day 1: You place your order online and receive a confirmation email
- Within 1 working day: We email you to request 3 simple measurements from your bay window
- Within 2–3 weeks: We manufacture your bespoke radiator in our UK workshop
- Delivery: We contact you to arrange free delivery to your door
How long does it take to receive my radiator?
Our typical lead time is 2–3 weeks from when we receive your measurements, plus delivery time. Because every radiator is made to order in our UK workshop, we don't hold stock — your radiator is built specifically for your bay window.
If you have a specific deadline (e.g. a boiler upgrade or building project), please contact us and we will do our best to try and accommodate your timescale.
Is delivery free and where do you deliver to?
Yes — delivery is free to mainland UK, including England, Wales and most of Scotland.
If you are in the Scottish Highlands, Northern Ireland, the Channel Islands or other offshore areas, please contact us before ordering as a surcharge may apply. We do not currently deliver outside the UK.
Do you offer a discount if I order more than one radiator?
Yes —order 2 or more radiators and save 10%. The discount is applied automatically at checkout. If you are ordering for multiple rooms or a full property, please contact us to discuss your requirements as further savings may be available.
🔧 Valves, Fitting & Installation
What valves do I need for a curved bay window radiator?
You will need a pair of radiator valves — one flow and one return. Our radiators use a standard 1/2" BSP pipe connection. The most common choice for bay windows is angled valves, as pipework typically rises from the floor.
We recommend thermostatic radiator valves (TRVs) for energy efficiency and room-by-room temperature control. If your pipes come from the wall rather than the floor, straight valves may be more appropriate. Your plumber or heating engineer can advise.
Can I use thermostatic radiator valves (TRVs) with your radiators?
Yes — our curved radiators are fully compatible with standard 15mm thermostatic radiator valves (TRVs) from any major manufacturer, including Drayton, Honeywell and Danfoss.
TRVs are recommended as they allow you to control the temperature room by room and can meaningfully reduce your heating bills. Ask your installer whether angled or straight TRVs are best for your pipework layout.
What pipe centres do your radiators use?
Our radiators use a standard TBOE (Top & Bottom Opposite Ends) pipe centre spacing between the flow and return connections — the UK standard, compatible with the vast majority of existing central heating systems. Both connections are positioned at the bottom of the radiator, at each end.
If your existing system uses a different configuration, please contact us before ordering.
What is included when the radiator arrives?
Your order includes everything needed to hang the radiator:
- Your bespoke curved radiator panel
- Wall mounting brackets (sized for your radiator)
- Bleed valve
- End cap
Not included: Radiator valves (sold separately), a spirit level, drill and rawlplugs (for fitting).
Can I fit the radiator myself, or do I need a plumber?
Hanging the radiator on the brackets is within the abilities of a competent DIYer. However, connecting to your central heating system (joining and pressure-testing the pipework) should be carried out by a qualified plumber or Gas Safe registered engineer.
Our full step-by-step Fitting Guide covers bracket positioning, valve connection, bleeding and balancing your system.
How do I bleed my curved radiator and why does it matter?
Bleeding removes trapped air that stops the radiator heating fully. To bleed your radiator:
- Turn off the heating and allow the system to cool slightly
- Use a radiator bleed key on the bleed valve (top of the radiator)
- Turn anticlockwise slowly — you'll hear hissing as air escapes
- As soon as water trickles out, close the valve immediately
- Check your boiler pressure and top up if it has dropped
A radiator bleed key costs less than £2 from any hardware store.
🏠 Product & Compatibility
What finish is the radiator available in?
Our radiators are finished in white RAL 9016 powder coat as standard — the most popular choice and suited to the vast majority of UK interiors.
If you require a different colour or finish, you are more than welcome to paint yourself after fitting. This does not in any way affect the guarantee on the radiators.
Can I paint my curved radiator a different colour?
Yes. Use a radiator enamel paint (available from most DIY retailers). Before painting, ensure the radiator surface is clean, dry and lightly sanded. Allow the paint to fully cure before turning the heating on.
Are your radiators compatible with heat pump systems?
Our radiators can work with heat pump systems, but there is an important consideration: heat pumps operate at lower flow temperatures (35–45°C) compared to gas boilers (70–80°C). At lower temperatures, a radiator produces less heat output.
We recommend consulting your heat pump installer to confirm that the BTU output of the radiator at the lower flow temperature will meet your room's requirements. Contact us for further advice.
Should I add corrosion inhibitor to my central heating system?
Yes — we strongly recommend it. Without corrosion inhibitor, the water in your system can cause internal rust, sludge build-up and reduced efficiency, which shortens the life of your radiators, boiler and pump.
Products such as Fernox F1 or Sentinel X100 are widely available and should be added when your radiator is installed. Inhibitor levels should be checked every 1–2 years. Ask your plumber to check or replenish the inhibitor at your next service.
Do you supply to the trade — plumbers and heating engineers?
Yes- we supply homeowners and trade customers alike. If you are a plumber, heating engineer or property developer ordering for a client or multiple properties, please contact us to discuss your requirements. Trade pricing and priority lead times are available for repeat or volume orders.
✅ Guarantee & Returns
What is your guarantee if the radiator doesn't fit my bay window?
We stand behind every radiator we make. If your radiator does not fit correctly, we will reshape or remake it at no cost to you.
To ensure a perfect fit, it's important to provide accurate measurements when we contact you after ordering. If you are at all unsure about measuring, call us on 0208 432 4782 before ordering and we will walk you through it.
Can I return a curved radiator if I change my mind?
Because every radiator is manufactured specifically to your bay window measurements, we are unable to accept returns for change of mind- the radiator is built uniquely for you and cannot be resold.
We strongly encourage you to contact us with any questions before ordering so we can ensure you are making the right choice. If your radiator arrives damaged or faulty, please report this within 48 hours of delivery with photographs and we will arrange a repair or replacement promptly.
Still have a question?
Our team of curved radiator specialists are happy to help you choose the right size before you order.