Name: Der ultimative Heizkörper-Entlüftungsschlüssel mit imperialen und metrischen Schlüsseln
Brand: Heatlab - Central Heating Products
SKU: 5555000
Price: 6.99 GBP
Availability: InStock
Rating: 5.0 (26 reviews)

🇬🇧 Invented by a UK heating engineer • 50,000+ sold

See the RadKey up close

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See the RadKey up close

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See it in action

Watch the 40-second demonstration

See it in action

Watch the 40-second demonstration

THE ORIGINAL HEATLAB DUAL-SIZE BLEED KEY

The Ultimate Radiator Key.

Two precise sizes. One proper handle. Easier bleeding on old and new radiators.

See the RadKey up close

Tap an image

See it in action

Watch the 40-second demonstration

4.7/5

from 1,346 Amazon ratings

Special offer: save £2 when you buy 2.

✓ Lifetime warranty ✓ Royal Mail delivery ✓ Secure checkout

Never Struggle to Bleed a Radiator Again!

Tiny one-size brass keys can feel loose and give you very little to grip. HeatLab’s UK-designed key combines smaller imperial and standard metric ends with a proper 7.5cm leverage handle.

Two accurate sizes — for older imperial and modern metric vents

Proper leverage — a comfortable 7.5cm handle

Made as one solid tool — heat-treated 17-7 stainless steel

Original HeatLab design

Special offer save £2 when you buy 2.

UK registered design GB6365497

✓ Lifetime warranty ✓ Royal Mail delivery ✓ Secure checkout

50,000+ sold

4.7/5 from 1,346 Amazon ratings

🇬🇧 UK heating-engineer design

Lifetime warranty

WHY A BASIC KEY CAN LET YOU DOWN

It may be the key — not the radiator.

Many traditional keys give you one size and tiny wings to grip. HeatLab’s original design solves both problems in one compact tool.

HeatLab RadKey

Typical basic key

Two precise sizes

Often one size

7.5cm leverage handle

Small wings to grip

Heat-treated stainless steel

Often softer brass

Lifetime warranty

Warranty varies

Basic radiator keys vary. This comparison reflects common small, single-size brass designs.

Designed after 20+ years working on heating systems: the right fit, better control and one solid piece of steel.

Two ends. The right fit.

Old radiator? New radiator? You are covered.

01

Smaller imperial end for the older UK radiator vents that defeat many standard keys.

02

Standard metric end for the square bleed screws used on most modern radiators.

03

Snug engagement helps reduce slipping and gives you more confidence at the valve.

Choose your pack

Why we made the Ultimate Radiator Key

THE ORIGINAL HEATLAB INVENTION

Designed by a UK heating engineer — not copied from a generic key.

After more than 20 years working on heating systems, HeatLab founder Lee designed the key he wanted in his own toolkit: two useful sizes, a proper handle and one solid piece of steel.

Imperial + metric ends

for older and newer radiators

One solid piece

of heat-treated 17-7 stainless steel

A proper 7.5cm handle

for a steadier, easier turn

GB

Designed in Hertfordshire, UK

Registered design GB6365497

Built as one proper tool

Precision-cut from one solid piece of stainless steel.

The whole Ultimate Radiator Key — both ends and the 7.5cm handle — is cut from a single piece of heat-treated 17-7 stainless steel. There is no separate handle or soft cast body to twist out of shape.

17-7 stainless steel for strength and durability

One-piece construction with no joint to loosen

Flat, compact shape with a keyring hole

Lifetime warranty from HeatLab

4.7

out of 5 on Amazon

PROVEN BY RADKEY CUSTOMERS

Rated 4.7/5 from 1,346 Amazon ratings.

Recurring customer themes:

Fits radiators their old keys would not

Especially older and unusually small square vents

Feels like a proper tool

Solid stainless steel rather than a tiny brass casting

More leverage and less fiddling

A longer handle that is easier to hold and turn

These are concise paraphrases of recurring Amazon review themes, not individual quotations.

Ultimate Radiator Key Amazon rating and volume checked 8 August 2026. Ratings change as new reviews are added.

Questions, answered

Everything you need to know.

Will it fit my radiator?

The Ultimate Radiator Key has a standard metric end for modern radiators and a smaller imperial end for older UK radiator vents. It is designed for the common square bleed screws found on old and new radiators. Screwdriver-slot and specialist valve types need their own tool.

Why not use a normal radiator key?

Most basic keys give you one size and very little to grip. If that size is loose on an older or worn vent, it can slip. The Ultimate Radiator Key gives you two square sizes plus a longer handle for a more controlled turn.

Will it work on a painted, worn or damaged bleed screw?

If the square is still intact enough for one end to engage snugly, the closer fit and longer handle can make a difficult vent much easier to turn. No radiator key can safely rescue a completely rounded, snapped or seized bleed screw; those may need the vent replacing by a heating professional.

Is it suitable for homeowners as well as heating engineers?

Yes. It was designed by a UK heating engineer for everyday use, but there is nothing complicated about it: choose the snug-fitting end, turn slowly and close the vent as soon as water appears.

What is it made from?

The Ultimate Radiator Key is precision-cut as one solid piece from heat-treated 17-7 stainless steel. Both key ends and the handle are part of the same piece, with no separate joint to loosen.

Does it have a warranty?

Yes. HeatLab backs the Ultimate Radiator Key with a lifetime warranty. Order support is handled directly by the HeatLab team in the UK.

Buy 2 for £11.98 · £5.99 each

50,000+ sold · One tool · Two sizes

Make bleeding radiators easy.

Get the original HeatLab Ultimate Radiator Key for £6.99.

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Ultimate RadKey

£6.99 - over 1000 5 star reviews!