400mm High Horizontal Radiators

We have 8 horizontal radiators 400mm high in stock from Carisa and Ethiant, from 425mm to 1800mm wide, priced from £164.32 to £459.05 Heat outputs run from 1,020 BTU/hr for the slimmest models to 6,656 BTU/hr for the widest doubles, so there is a 400mm radiator here for anything from a bedroom, home office or small kitchen to a large living room or an open-plan kitchen-diner.

Height is the first thing to fix when you choose a horizontal radiator: it decides whether the radiator clears a window sill, a worktop or a dado rail, and it sets the pipe centres if you are replacing an existing radiator. Once the height is right, use the width and the BTU figure to get the output the room needs. Every model is in stock for free delivery to mainland England and Wales, and each product page shows the certified heat output for every size so you can match it to your room with our BTU calculator.

400mm High Horizontal Radiators in stock

Compare every 400mm high horizontal radiator in stock

Model	Finishes	Sizes in this group	Heat output (BTU/hr, ΔT50)	From
Traditional 3 Column Horizontal Radiators 400 Height	White	400 × 1370mm, 400 × 1190mm, 400 × 965mm, 400 × 830mm …	1,258–4,193	£164.32
Traditional 4 Column Horizontal Radiators 400 Height	White	400 × 1370mm, 400 × 1190mm, 400 × 965mm, 400 × 830mm …	1,583–5,277	£231
Traditional 6 Column Horizontal Radiators 400 Height	White	400 × 1190mm, 400 × 965mm, 400 × 830mm	4,783–6,656	£307.84
Carisa Nemo XL Horizontal Aluminium Designer Radiator	Textured Black, Textured Anthracite, Textured White	375 × 1800mm	2,437	£317.69
Carisa Monza XL Horizontal Aluminium Designer Radiator	Textured Black, Textured Anthracite, Textured White	375 × 1800mm	2,733	£330.34
Carisa Fame H Horizontal Aluminium Designer Radiator	Brushed Brass, Polished Aluminium, Textured Anthracite, Textured White	400 × 1000mm	1,020	£353.40
Carisa Nemo XL Double Horizontal Aluminium Designer Radiator	Textured Black, Textured Anthracite, Textured White	375 × 1800mm	4,298	£456.82
Carisa Monza XL Double Horizontal Aluminium Designer Radiator	Textured Black, Textured Anthracite, Textured White	375 × 1800mm	4,298	£456.82

Questions about 400mm high horizontal radiators

How much heat does a 400mm high horizontal radiator give out?

Between 1,020 and 6,656 BTU/hr at ΔT50 across the 8 models on this page. The highest output here is the Traditional 6 Column Horizontal Radiators 400 Height at 6,656 BTU/hr (1,952 W). All figures are the manufacturers’ certified outputs to EN 442, quoted at ΔT50 — the UK standard for sizing central-heating radiators.

Which 400mm high horizontal radiator is the best value for heat?

On heat per pound it is the Traditional 3 Column Horizontal Radiators 400 Height: 2,936 BTU/hr for £187.20, about 16 BTU for every £1. The cheapest model on the page starts at £164.32.

What size room will it heat?

It depends on the model — the range on this page runs from a cloakroom, en-suite or small box room at 1,020 BTU/hr up to a large living room or an open-plan kitchen-diner at 6,656 BTU/hr. A well-insulated modern room needs far less than an older one with single glazing and an outside wall, so use our BTU calculator with your room’s measurements before you choose.

What colours and finishes are available?

In this group we have 8 in white, 5 in anthracite, 4 in black, 1 in brass & gold, 1 in raw metal & stainless steel. Colour is chosen as a finish option on the product page.

What else do I need to fit it?

A pair of radiator valves (a thermostatic set is the usual choice) — see our valves and accessories. Wall brackets are supplied with every radiator, and column radiators in this group can be fitted with feet where the wall will not take the full weight. Delivery to mainland England and Wales is free.

Related sizes and ranges

300mm High Horizontal Radiators · 500mm High Horizontal Radiators · 400 x 800mm Horizontal Radiators · 400 x 1000mm Horizontal Radiators · 400 x 1200mm Horizontal Radiators · 400 x 1800mm Horizontal Radiators

Back to Radiators by size.