Angled or straight radiator valve
Updated: October 2026
You already know you need a full 15 mm set, and you are about to order the body that does not match the pipes. An angled or straight radiator valve is not a style choice. It is the shape that either continues the pipe or turns it, and a wrong one means a second delivery. Corner is the third shape, and UK guides do not describe every pipe run the same way. Copy the valve you are taking off. If there is no old valve, match the pipe direction to the inlet, and treat corner as where the head sits, not as a different pipe size. Heads have no pattern. If you only needed a dial, leave this page for the [radiator thermostat comparison](/hub/thermostats/radiator-thermostat). Peter F., DIY & tools editor, wrote this in October 2026 from those listings. There was no lab test. A qualifying purchase can earn us a commission at no extra cost to you.
You already know you need a full 15 mm set, and you are about to order the body that does not match the pipes. An angled or straight radiator valve is not a style choice.
You already know you need a full 15 mm set, and you are about to order the body that does not match the pipes. An angled or straight radiator valve is not a style choice. It is the shape that either continues the pipe or turns it, and a wrong one means a second delivery. Corner is the third shape, and UK guides do not describe every pipe run the same way. Copy the valve you are taking off. If there is no old valve, match the pipe direction to the inlet, and treat corner as where the head sits, not as a different pipe size. Heads have no pattern. If you only needed a dial, leave this page for the radiator thermostat comparison. Peter F., DIY & tools editor, wrote this in October 2026 from those listings. There was no lab test. A qualifying purchase can earn us a commission at no extra cost to you.
Our top picks
| Badge | Product | Pattern | Connection | Pack | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  SVNR SVNR angled anthracite TRV | Angled | 15 mm BSP | 1 set (set-of-20 field conflicts) | 9.6 | about £24.99 | View offer |
 West Radiators Marella chrome straight TRV | Straight | 15 mm | 1 set | 9.2 | about £21.99 | View offer | |
 UK Radiators UK Radiators corner TRV | Corner | 1/2 inch x 15 mm, BSP | 1 set | 9.0 | about £24.80 | View offer |
On this page
Three shapes, one pipe run
A straight radiator valve keeps the pipe and the radiator inlet on the same line. The water comes up, or along, and enters without a bend inside the valve body. You choose it when the pipe already lines up with the inlet. On a chrome towel rail, that is often pipes coming out of the wall into side entries. The Marella listing says that in the bullet, and it also says bottom entries should be checked with the installer. One UK review on that listing ordered straight and then bought again because the return wanted a vertical pattern. That second order is the cost of guessing. An angled valve turns the flow through 90 degrees inside the body. You choose it when the pipe arrives from a different direction to the inlet: up from the floor into the side of a panel, or out of the wall into the bottom, depending on which guide you are reading. You cannot twist a straight body the other way up and call it angled. A corner valve also turns 90 degrees, and the head then sits along the wall rather than sticking out into the room. The Radiator Company assigns corner to wall pipes into a side connection. BestHeating says angled and corner are the same bend and that the difference is which way the head faces. Both can be true of the geometry and still produce a return if the head hits the wall, the floor, or the skirting. Corner is still 15 mm in this set. Photograph the old valve from above and from the side before you add a set to the basket.
Where the guides agree
The clear cases are the ones where the pipe and the inlet already share a direction. Floor pipes that rise straight into the bottom tappings of a panel are the situation Toasty and Sanctuary Bathrooms both treat as straight, and The Radiator Company says the same: straight for pipes straight up into the base. Wall pipes that must turn once to enter a side tapping are where those guides start to say angled or corner. Toasty’s shorthand is floor-to-bottom often straight, floor-to-side often angled, and wall-to-side angled or corner. If your pipes do that obvious thing, and the old valve agrees, order that shape. The disagreement is the edge. BestHeating’s table maps wall, floor, and along-wall against bottom, side, and middle inlets, and then treats angled and corner as interchangeable in shape. Sanctuary’s table is stricter: straight for floor-to-bottom or a rare along-wall side run, and corner for wall pipes only. The Radiator Company keeps three names and gives corner the wall-to-side job, while angled covers a 90-degree turn more generally, including floor-to-side or wall-to-base. You cannot publish one of those diagrams as the rule for every UK radiator. The safe line is the valve already on the radiator. If the new radiator has different tappings from the old one, the old shape is a clue and not a copy. A straight set used the other way up does not become an angled set. You will bend the pipe, or you will cross-thread the nut. Pairs are sold as a pattern. You do not get a straight lockshield and an angled TRV in the Marella carton. Thread and the thermostat-room rule are on the thermostatic radiator valve buying guide.
Which set in this comparison is which
Two listings are corner. VANCOCO, B0FY69GLCS, is two matte black corner sets at about £49.99, stated as 1/2 inch by 15 mm compression, with lockshields and heads. UK Radiators STI-TRV-FBC, B0CK537BJ1, is one matt black corner set at about £24.80. One reviewer of that UK Radiators set said it suited copper and not multilayer. That sentence is about pipe material, not about pattern. The shape is still corner. Count the pieces before you assume the £24.80 box is a pair of radiators. The listing’s piece count and the lockshield line have already confused at least one buyer. Two listings are angled. SVNR, B0DB8HJXZ1, is one anthracite angled set at about £24.99. The set-name field says Set of 20 and the title is one set, so do not order it as a trade pack. Talus Bold, B0BNQCJ6HT, is one black angled set at about £29.95, model TAL-TRV-FBA. Check the grey or the black against the rail. One SVNR buyer returned the set because the grey did not match. Colour is not pattern, but a wrong colour is the same second delivery. One listing is straight. Marella, B0C53R83H9, sold under West Radiators, is the chrome straight set at about £21.99, with a lockshield and a frost line that says the valve still operates below 7 °C. The bullet’s own pattern note is wall pipes into side entries. If your pipes come up from the floor into the bottom, do not use that bullet as permission. This page stops at the shape. It does not rank the brass, the star line, or the EN 215 claims.
Heads have no pattern
A replacement head does not have an angled, straight, or corner body. The Honeywell Thera-5, the Manissa head, the Yi kai pair, the Rivvra pair, the LJAPPLIED pair, and the DYOUen title are all heads. They screw onto the body you already have. If that body is the wrong shape, an M30 head will not turn the pipe through 90 degrees. You will still own a dial and the wrong brass. The tado° X trio is also heads, with adapters, and the same limit: adapters do not convert a straight body into a corner body. If you are holding a cracked dial and the pipes are fine, the head pages are the next stop, not a valve-set filter. If you are holding a new radiator with bare tappings, ignore the head-only rows until the pattern is chosen. Photograph four things before you order: the inlet on the radiator, the direction the pipe leaves the floor or the wall, the way the old head faces, and a tape across the pipe if you are not sure it is 15 mm. Toasty’s guide asks for the outside diameter when you are unsure. A 15 mm compression set on a different pipe is a pattern problem and a size problem at once. Do not add a second pattern in case. The return of an unused brass set is cheaper than a leak, and it is still a week without the radiator.
Common questions
What is the difference between angled and straight?
Straight continues the pipe into the inlet on the same line. Angled turns that flow 90 degrees inside the body. If the pipe already points at the tapping, straight is the one to copy. If the pipe has to change direction, straight will not do it for you.
What is a corner valve if both turn 90 degrees?
Corner is the 90-degree body whose head sits along the wall. BestHeating treats the bend as the same as angled and separates them by head direction. The Radiator Company assigns corner to wall-to-side. Copy the old valve so the head does not hit the wall or the floor.
Pipes from the floor into the bottom of a panel: which way?
Guides that draw this case call it straight: The Radiator Company, Toasty, and Sanctuary. If the new radiator’s bottom tappings do not line up with those pipes, do not force a straight set sideways. Check the inlet before you order.
Pipes from the wall into the side of a towel rail: which way?
Often angled or corner, so the head can face into the room or along the wall. The Marella bullet describes straight for wall pipes into side entries, and a review on that listing still had to reorder. Match the valve you are removing, not a single shop diagram.
Can I use a straight set the other way up?
No. Turning the body over does not create the bend an angled or corner valve has. You will strain the pipe or the nut. Order the pattern that meets the pipe squarely.
Do replacement heads have a pattern?
No. An M30 head, including the Thera-5 and the Manissa head, fits a body. It does not change straight into angled. The tado° adapters do not do that either. If the brass is wrong, buy a set in the right shape from the main comparison.
What do I photograph before I order?
The inlet, the pipe’s direction out of the floor or the wall, the way the existing head faces, and the pipe diameter if you are unsure it is 15 mm. Those four pictures settle more arguments than another guide’s table.
Related pages
Sources
Public UK sources for thermostatic radiator valves, Approved Document L as BEAMA explains it for England and Wales, and BS EN 215. Listings are the amazon.co.uk captures for these twelve ASINs, not a live reload on 17 October 2026. Prices on amazon.co.uk move.
- Energy Saving Trust, thermostats and heating controls (retrieved 17 October 2026)
- BEAMA TRV factsheet for installers (retrieved 17 October 2026)
- BEAMA Part L 2022 heating controls guidance (retrieved 17 October 2026)
- Approved Document L, volume 1, dwellings (retrieved 17 October 2026)
- BSI, BS EN 215:2019 (retrieved 17 October 2026)
- tado°, X compatibility with other product lines (retrieved 17 October 2026)
- tado° shop, Smart Radiator Thermostat X (retrieved 17 October 2026)
- Approved Document L, 2026 index on GOV.UK (retrieved 17 October 2026)