How to Hang a Heated Towel Rail: Complete Guide

A heated towel rail is one of those bathroom upgrades that sounds more complicated than it actually is. The plumbing is identical to connecting any radiator — two valves onto two pipes. The fiddly bit is getting it level on the wall, especially when you’re drilling through tiles. Get the preparation right and the rest follows.

Tools and Materials

Preparation — Bungs, Bleed Valve, and Valve Inserts

Lay the towel rail flat on its face. You’ll see four threaded holes — two at the top and two at the bottom.

Top holes

One top hole gets a bleed valve — a small brass fitting with a square key slot. The other gets a blanking plug (bung). Both come with rubber O-rings, so they seal without PTFE tape. Just nip them up hand-tight with a spanner — the O-ring does the work.

Bottom holes — fitting the valve tails

The two bottom holes are where the radiator valves connect. Your valve type depends on your pipe layout:

• Pipes coming from the wall: angled valves (the most common setup in bathroom refits)
• Pipes coming from the floor: straight valves

Each valve has two parts — the body that connects to the copper pipe, and a threaded tail that screws into the radiator. Separate the tail from the body and prepare it for fitting:

1. Wrap PTFE tape around the valve tail thread. Wind it on clockwise (looking at the end of the thread) so it doesn’t unravel as you screw it in. Use about 10–12 wraps for a good seal. Alternatively, use Loctite 55 or a similar thread sealant if you prefer.
2. Screw the tail into the radiator using a radiator allen key (hex key). These are inexpensive and essential — a standard allen key set won’t have the right size. Wind it in until it’s snug.
3. Don’t overtighten. Towel rail threads are often softer than a standard radiator. If you go too hard, you’ll strip the thread and the whole rail is scrap. Firm is enough — the PTFE is doing the sealing, not brute force.

Repeat on the other side.

Fitting the Wall Brackets to the Radiator

Every towel rail comes with wall mounting brackets. The design varies between manufacturers, but the principle is the same: one part bolts to the wall, the other clips around the rail, and a grub screw locks the two together so you can make fine adjustments once it’s on the wall.

1. Check the instructions for the bracket positions. They’ll specify a measurement from the side of the rail and which bar to mount under. If your rail has four brackets (two top, two bottom), each pair will have a different measurement.
2. Slide the bracket onto the rail from the inside, with the retaining clip loosely in place. Don’t tighten yet.
3. Measure and position. Use your tape measure to set the bracket at the specified distance from the edge of the rail.
4. Nip up the retaining clip just enough to hold the bracket in place. These are often plastic, so go easy — cracking one means a call to the manufacturer for a replacement.

If your instructions don’t specify bracket positions (some cheaper rails don’t), place them as far towards the outside edges as the rail allows. This gives the most stability and leaves the centre clear for hanging towels.

Marking Out the Wall Position

This is the step that makes or breaks the job. Take your time here.

Find your centre line

If your pipes are already coming out of the wall, measure between them and find the midpoint — that’s your centre line. If you’re working from scratch, measure the rail’s width, halve it, and mark the centre line on the wall where you want it.

Set the height

You need a way to hold the rail at the correct height while you mark the bracket positions. The easiest method is a stack of boxes, toolboxes, or anything sturdy enough to support the weight temporarily. Set the rail on top at the height you want, check it looks right, and adjust until you’re happy.

Mark the bracket holes

1. Slide the wall-mount part of each bracket onto the radiator brackets.
2. Push the rail back against the wall so the brackets sit flat.
3. Place a spirit level across the top of the rail (or across the two top brackets). Get it perfectly level.
4. Draw around each bracket with a pencil. These outlines are your reference zones.
5. Lift the rail away and place a mark in the centre of each bracket outline where the screw hole will be.

Before you drill, offer the rail back up one more time and check that the valve tails line up with the pipe connections. A level rail that doesn’t reach its pipes is no use to anyone.

Drilling and Fixing the Brackets

Drilling through tiles

If you’re going through tiles, use a tile drill bit (usually a diamond or carbide-tipped bit) at slow speed with no hammer action to get through the tile face. Once you’re through the tile and into the wall behind, switch to a standard masonry bit and use hammer action to drill to the required depth for your wall plug.

Fixing the brackets

1. Push the wall plug into the hole. If you’re behind tiles, push the plug past the tile and into the masonry — the plug needs to grip the wall, not the tile. You may need to trim the plug collar if it catches on the tile face.
2. Line up the bracket over the hole. Drop the screw (with washer if provided) through the bracket and into the plug.
3. Tighten until the bracket is firm against the wall. Don’t overtighten — these brackets are often zinc alloy or plastic and will crack under excessive force.
4. Repeat for all brackets.

Make sure the grub screw holes on each bracket face outwards (towards the room, not towards the wall). You need to reach these with an allen key once the rail is hung — if they face the wall, you won’t be able to get to them.

Hanging the Rail and Connecting the Valves

With the brackets fixed, you can hang the rail. Lower it onto the brackets so the rail clips sit in the wall mounts, and at the same time guide the valve tails down onto the valve bodies on the pipe connections.

Connecting the valves

The valve tails drop into the valve bodies. There’s an O-ring inside each valve body that creates the seal, so you do not need PTFE tape on this connection — just thread the nut on and tighten it up.

1. Start the nut by hand to avoid cross-threading.
2. Tighten with an adjustable spanner. Firm is enough — the O-ring seals under light compression. Overtightening achieves nothing except a crushed O-ring and a leak.
3. Repeat on the other side.

Levelling and Locking It in Place

With the valves connected and the rail sitting on the brackets, place your spirit level across the top. The brackets have a sliding adjustment that lets you move the rail in and out from the wall, and the grub screws on the sides lock the rail at the position you set.

1. Adjust until level. Slide the rail left or right on the brackets, and adjust each bracket’s depth (distance from wall) until the spirit level reads true.
2. Start the grub screws. Once level, get each grub screw started by hand with the allen key. Don’t fully tighten any single one first — start them all, recheck the level, then tighten them all evenly.
3. Final check. Step back and look at it. Is it visually straight against the tile lines? Sometimes a rail can read level but look off if the tiles aren’t perfectly level themselves. Trust the spirit level, but if it looks obviously wrong, investigate.

Once the grub screws are tight, the rail is locked in position and should not move. Give it a firm push to confirm it’s solid.

Filling, Bleeding, and Leak Checking

If you’ve been working on a drained or isolated system, you now need to fill the rail and get the air out.

1. Make sure the bleed valve at the top is closed.
2. Open both radiator valves (the lock shield and the TRV or manual valve, whichever you have).
3. Repressurise or refill the system. On a sealed (combi or system boiler) system, use the filling loop to bring the pressure back up to around 1–1.5 bar. On a gravity-fed system, the header tank will refill automatically.
4. Open the bleed valve at the top of the rail. You’ll hear air hissing out as water pushes up from the bottom. Once water appears at the bleed valve (have a cloth ready), close it.
5. Check every connection for leaks. Run your finger over the valve nuts, the valve body connections to the copper pipes, and the bleed valve and bung at the top. Any dampness at all means something needs attention — don’t leave it for “later”.

Turn the heating on and let the system come up to temperature. Check for leaks again once it’s hot — joints can weep when the metal expands under heat that were dry when cold. If everything holds, you’re done.