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45 years of trusted expertise1200mm Radiators
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At City Plumbing, we stock a complete range of 1200mm radiators for domestic and commercial central heating systems. Our inventory covers Type 11 single panels through to Type 22 double panels, providing varying heat outputs for a fixed 1200mm wall space. Every steel panel radiator in this category is supplied ready for installation, complete with mounting brackets and bleed valves.
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Proportion Guide:
A 1200mm horizontal radiator is specified primarily for installation beneath standard double-casement windows.
To achieve an architectural finish, the edges of the radiator panel should align directly with the edges of the window frame above it. This placement serves a specific functional purpose. Positioning the heat source beneath the glazing directly counteracts cold downdraughts from the glass, forcing the cold air to mix with the rising convection currents.
Clearance Guide: Pipework and Valves
When measuring wall space for a 1200mm radiator, the stated dimension covers the steel panel only. You must calculate additional clearance for the connection hardware.
- The 90mm rule: Add approximately 90mm to the total width of the panel to accommodate standard Thermostatic Radiator Valves (TRVs) at one end and a lockshield valve at the other.
- Total lateral space: A 1200mm radiator requires a minimum bare wall space of 1290mm.
- Pipework centres: If you are laying new pipework under floorboards, the pipe centres must emerge at a distance of 1290mm apart to align correctly with the valve inlets on a 1200mm panel.
Is a 1200mm Radiator Powerful Enough For Your Room?
Because your installation is physically restricted to a 1200mm width, you must adjust the thickness of the panel to increase or decrease the heat output.
Before selecting a specific model, enter your room dimensions, window size, and insulation type into our internal BTU Calculator.
- If your required British Thermal Unit (BTU) output is low, select a 1200mm Type 11 (Single Panel). This sits tight against the wall and uses minimal space.
- If your required BTU output is high, select a 1200mm Type 22 (Double Panel). This unit protrudes further from the wall but delivers nearly double the heat output without exceeding your 1200mm width restriction.
Frequently Asked Questions (FAQs)
Can I fit a 1200mm radiator into a 1200mm alcove?
No. A 1200mm radiator requires 1290mm of clearance to accommodate the valves on either side. If your physical gap is exactly 1200mm, you must step down to a 1000mm or 1100mm radiator.
Are 1200mm radiators suitable for vertical installation?
Yes. While 1200mm is a standard width for horizontal models under windows, a 1200mm vertical radiator is often specified for spaces with restricted head height. This includes loft conversions, under-stair bathrooms, and basement renovations.
Do 1200mm radiators come with brackets?
Yes. All standard steel panel radiators supplied by City Plumbing include the necessary wall mounting brackets and bleed valves. You will only need to purchase the radiator valves separately.
Next Steps
- Run your room dimensions through our BTU calculator to determine if you need a single or double panel.
- Measure your available wall space to ensure you have a minimum clearance of 1290mm.
- Add the required angled or straight radiator valves to your order before checkout.