400w Electric Radiators | Efficient Heating for Compact Rooms
Our 400w electric radiators offer a step up in heating power while remaining one of the most economical outputs in our range. Designed for small rooms up to approximately 4m², they are an excellent choice for compact bathrooms, en-suites, downstairs WCs, small hallways, and utility rooms where a little extra warmth is needed without the running costs of a larger radiator.
Like all electric radiators at Electric Radiator Shop, our 400w models are 100% efficient at the point of use — every watt of electricity you consume is converted directly into heat for your room. With precise thermostat control and programmable settings on selected models, you stay comfortable without wasting energy.
Installation is straightforward. Browse our 400w electric radiator range below, or use our Electric Heating Calculator to confirm this is the right output for your space.
Electrorad WiFi Electric Towel Rail | White & Chrome | 400w – 700w
In stock
Price range: £166.00 through £220.00
or £68.33interest-free for 3 months
Electrorad T400Pc-WiFi Electric Towel Rail 400w – Chrome
400w Heats up to 5m²In stock
Original price was: £330.00.£198.00Current price is: £198.00.or £66.00interest-free for 3 months
Electrorad T400Pw-WiFi Electric Towel Rail 400w – White
400w Heats up to 5m²In stock
Original price was: £276.67.£166.00Current price is: £166.00.or £55.33interest-free for 3 monthsIs a 400w Electric Radiator the Right Choice for Your Room?
A 400w electric radiator sits between our entry-level 300w and mid-range 500w models, making it ideal for rooms that are slightly too large for a 300w unit but don't require a full 500w output. As a general guide, 400 watts is suitable for well-insulated rooms up to around 4m² — a small en-suite, a downstairs toilet, a compact utility room, or a small porch area.
If your room has a high ceiling, large windows, or is on an exposed external wall, a 500w model may serve you better. Our free Electric Radiator Size Calculator takes all of these factors into account and gives you a reliable recommendation in minutes. If you'd prefer to speak to someone, our UK-based team is available Monday to Friday, 9am–5pm on 0113 239 9919.
100% efficient, room-by-room control. Because electric radiators work independently of one another, you only heat the rooms you are actually using. A 400w radiator in a small bathroom, for example, can be programmed to come on thirty minutes before your morning routine and switch off automatically once the room is up to temperature — saving energy without any compromise on comfort.
Simple installation, no plumbing required. Our 400w electric radiators are wall-mounted and connect to a standard 13A socket or fused spur. Most installations take under an hour and require no specialist tools or tradesperson for the basic plug-in setup. If hardwiring into a fused spur is preferred, a qualified electrician should carry out that part of the work.
Free UK delivery and manufacturer warranty included. Every 400w electric radiator we stock ships free across the UK, backed by a manufacturer's warranty and full support from our UK-based customer service team.