300 x 1800mm Horizontal Radiators

Looking for a horizontal radiator around 300mm high and 1800mm wide? We have 4 horizontal radiators in stock in this size from Carisa, priced from £258.17 to £368.28 with heat outputs from 1,828 to 3,224 BTU/hr (ΔT50). Actual dimensions in this group run from 280–280mm high and 1800–1800mm wide; the exact size, pipe centres and output of each model are on its product page.

A 300 x 1800 horizontal radiator is the size most UK homes were built around, so it usually replaces an existing radiator without moving the pipework, and the highest-output models here will heat a typical living room or a large bedroom. 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.

300 x 1800mm Horizontal Radiators in stock

Compare every 300 x 1800mm horizontal radiator in stock

Model	Finishes	Sizes in this group	Heat output (BTU/hr, ΔT50)	From
Carisa Nemo XL Horizontal Aluminium Designer Radiator	Textured Black, Textured Anthracite, Textured White	280 × 1800mm	1,828	£258.17
Carisa Monza XL Horizontal Aluminium Designer Radiator	Textured Black, Textured Anthracite, Textured White	280 × 1800mm	2,050	£267.84
Carisa Nemo XL Double Horizontal Aluminium Designer Radiator	Textured Black, Textured Anthracite, Textured White	280 × 1800mm	3,224	£368.28
Carisa Monza XL Double Horizontal Aluminium Designer Radiator	Textured Black, Textured Anthracite, Textured White	280 × 1800mm	3,224	£368.28

Questions about 300 x 1800mm horizontal radiators

How much heat does a 300 x 1800mm horizontal radiator give out?

Between 1,828 and 3,224 BTU/hr at ΔT50 across the 4 models on this page. The highest output here is the Carisa Monza XL Double Horizontal Aluminium Designer Radiator at 3,224 BTU/hr (945 W). All figures are the manufacturers’ certified outputs to EN 442, quoted at ΔT50 — the UK standard for sizing central-heating radiators.

Which 300 x 1800mm horizontal radiator is the best value for heat?

On heat per pound it is the Carisa Nemo XL Double Horizontal Aluminium Designer Radiator: 3,224 BTU/hr for £368.28, about 9 BTU for every £1. The cheapest model on the page starts at £258.17.

What size room will it heat?

It depends on the model — the range on this page runs from a bedroom, home office or small kitchen at 1,828 BTU/hr up to a typical living room or a large bedroom at 3,224 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 4 in black, 4 in anthracite, 4 in white. 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. Delivery to mainland England and Wales is free.

Related sizes and ranges

300 x 1200mm Horizontal Radiators · 300 x 1400mm Horizontal Radiators · 400 x 1800mm Horizontal Radiators · 300mm High Horizontal Radiators · 1800mm Wide Horizontal Radiators · 1,000–2,000 BTU Horizontal Radiators · 2,000–3,000 BTU Horizontal Radiators · 3,000–4,000 BTU Horizontal Radiators

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