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How to replace a towel rail heating element

Updated: 16 October 2026

The new element is in the box and the rail is still on the wall. This page on how to replace a towel rail heating element starts with whether you may open that rail, then the drain and the thread, then the fused spur. The rows are on the [towel radiator heating element comparison](/hub/heating/towel-radiator-heating-element). Thread, watts, and fuse are on the [towel rail heating element buying guide](/hub/heating/towel-radiator-heating-element/sub/towel-radiator-heating-element-buying-guide). We did not fit these rods in a lab. A qualifying purchase through our links can earn us a commission at no extra cost to you.

The new element is in the box and the rail is still on the wall. This page on how to replace a towel rail heating element starts with whether you may open that rail, then the drain and the thread, then the fused spur.

Our top picks

Greened House Greened House 300W WiFi chrome

Best overall

Greened House Greened House 300W WiFi chrome
9.4/10about £60.00
View offer
Rica Rica 300W PTC element

Preis-Tipp

Rica Rica 300W PTC element
8.8/10about £26.50
View offer
Manissa Manissa 300W chrome element

Alternative

Manissa Manissa 300W chrome element
8.0/10about £23.00
View offer
On this page
  1. 1.Which rail you are allowed to open
  2. 2.Swapping the rod on a wet rail
  3. 3.The fused spur is a different job
  4. 4.If it stays cold or gets too hot

Which rail you are allowed to open

Isolate the supply before you touch the boss. A cold rail can still be live. Dimplex's instructions for the BR electric towel rail say the owner does not drain that factory-filled rail. If the maker says leave it closed, stop. A wet rail with valves you can close is the rail this sequence is for. You drain that rail, not the whole house, and only if those valves hold. If a valve weeps, a plumber takes over. Summer valve order is on the dual fuel towel rail heating element page.

Swapping the rod on a wet rail

Close both valves, open the bleed, and catch the water before you unscrew the element. Put a tray under the boss. The element enters at the bottom. Greened House states that it does not go in the top. PTFE goes on the male thread. Seat the element and check for a drip before power. Leave the rail on the wall when you can reach the bottom boss. A boxed-in boss, a valve that will not isolate, or a rod that hits the far wall means the rail comes off. One Valdern review said no special tools. A tool-free comment is not a promise for your valves.
Greened House Greened House 300W WiFi chrome

Testsieger

Greened House Greened House 300W WiFi chrome
9.4/10about £60.00
View offer

The fused spur is a different job

Power stays off at the consumer unit while the boss is open. The fuse comes from the maker of the rod you fitted. Rica and Manissa say 3 A. The UK Radiators sheet specifies a 5 A BS 1362 fuse for its own element. If your leaflet differs, follow the leaflet or stop. In England and Wales, a new circuit or a bathroom-zone alteration is notifiable under Approved Document P. A like-for-like repair on an existing spur often is not. If you are not competent on the spur, stop with the element tight and the supply still isolated. Greened House prints a 110 mm lead. Control, once the lead reaches, is on the WiFi or PTC page.

If it stays cold or gets too hot

Restore power only after the leak check. If the rail stays cold, confirm the spur, the fuse, and that the element is under the fluid. A repeating trip or a burning smell means you stop. If the rail gets too hot, two Rica reviews say a unit did not cut out. Switch off and let it cool. Another 300 W element will not fix an open valve or a spur that was never live.

Common questions

Do I have to take the rail off the wall?
Not always. If you can reach the bottom boss, close both valves, and catch the fluid, you can change the element with the rail in place. Take it off when the boss is boxed in, the valves will not isolate, or the new rod hits the far wall. UK Radiators' sheet fits the element before that rail goes up, which suits a first install. A sealed factory-filled electric rail stays closed.
Do I drain the whole heating system?
Drain the towel rail only, and only when both valves close and hold. Open the bleed and catch the water at the boss. If a valve passes, you stop and call a plumber rather than drop the system. A sealed electric-only rail, such as the Dimplex BR unit in the maker's instructions, is not a user drain at all.
Where does PTFE go?
PTFE tape goes on the male thread of the element before you screw it into the bottom boss. The UK Radiators sheet for its touch element also uses an O-ring on that product. Tape will not fix a thread that is not 1/2 inch BSP. After you refill, check the joint cold, then again once the rail has been hot.
What if the rail was factory filled?
Leave it closed when the maker says so. Dimplex's BR instructions describe that electric-only rail as factory filled, with the bleed screw for a wet connection, and they do not ask the owner to drain it. Forcing the bleed to swap a rod is outside the wet-rail sequence on this page. A failed element on that kind of rail is a maker or electrician job.
The new rod is shorter. Is that a fail?
A shorter rod can still heat. Lengths in this set run from 250 mm on Rica to 380 mm on Manissa and the Greened House 400 W element. Rica reviews describe heat from a shorter element when the thread matches and the rod stays submerged. It fails the job if the rod meets the far wall and will not screw home, or if so much of it sits in air that the rail barely warms.
When do I stop and call an electrician?
Stop for a new circuit, a consumer-unit change, or work in the bathroom zones, which is notifiable in England and Wales under Approved Document P. Stop if you are not competent on the existing spur, if the RCD trips repeatedly, or if you smell burning. A like-for-like element on an existing spur is often outside that list, and the connection still has to meet BS 7671. Scotland and Northern Ireland use their own rules.

Related pages

Bathroom zones for electric heat

Towel radiator heating element

Best towel rail heating element for schedule or heat

Towel rail heating element buying guide: fit first

Dual fuel towel rail heating element: both valves off

WiFi towel rail element or PTC for schedule or heat

Sources

Public UK sources used for this comparison, plus the amazon.co.uk listings for these eight ASINs. Page updated 16 October 2026. Prices are the shelf figures on those listings, not a live re-check.

  1. IET Section 701 note (retrieved 16 October 2026)
  2. IET BS 7671:2018 FAQ (retrieved 16 October 2026)
  3. Approved Document P (2013) (retrieved 16 October 2026)
  4. Electrical Safety First: bathrooms (retrieved 16 October 2026)
  5. Ofgem price cap, 1 October to 31 December 2026 (retrieved 16 October 2026)
  6. Elegant Radiators heating elements guide (retrieved 16 October 2026)
  7. The Radiator Company dual-fuel guide (retrieved 16 October 2026)