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Sentinel X100 Central Heating Scale Inhibitor 1Ltr

4.8 (403 reviews)
SKU: 260223155436651 EAN: 5016402052719

Compare 3 prices for Sentinel X100 Central Heating Scale Inhibitor 1Ltr — from £16.99 to £23.03 across 3 UK sellers including Toolstation, Screwfix, Travis Perkins. Save up to £6.04 (26%).

£16.99 2h ago
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Compare Prices from 3 Sellers

Prices updated 19 Apr 2026
2
Screwfix
£16.99 +£0.00
7h
3
Travis Perkins
£23.03 +£6.04
13h
#2 Screwfix
7h ago
£16.99 +£0.00
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#3 Travis Perkins
13h ago
£23.03 +£6.04
View
Sentinel X100 Inhibitor provides protection for clean hydronic heating systems against limescale and corrosion. Suitable for use in all types of indirect heating system, Sentinel X100 Inhibitor will extend the life of the system, ensuring maximum efficiency and minimising fuel usage. Protects against limescale and corrosion TripleTechâ Anti-Corrosion Technology pH neutral formulation Suitable for hard, soft and artificially softened water A simple test kit is available to check levels Heavy duty inhibitor Energy Saving Trust Recommended Suitable for all system metals Ensures optimum system efficiency Helps prevent the formation of hydrogen gas
No specifications available
No features listed
No items listed

Customer Reviews 403

4.8
403 reviews
5 star
344
4 star
48
3 star
8
2 star
1
1 star
2
Sentinel X100 for Central Heating System
5.0
February 22, 2026
5db2fdb5-b0a4-5720-8621-b6661daec9a3 Verified Purchase

Great best quality product. Recommended by most boiler engineers

Boiler De-scaler
5.0
February 20, 2026
Amiran Verified Purchase

Improved heat output on radiators and boiler became almost silent after using the Sentinal Descaler liquid.

Dunnor 🤷
3.0
February 16, 2026
Dim witted Diyer Verified Purchase

I’ve been asked to review this product , well here goes , I don’t know , I put it in and ….. that’s it , how do I know what it’s doing . Simple answer . I won’t know whether it’s work until much later down the line . Maybe amend my review in a couple of years . Ciao for now

Every time
5.0
February 11, 2026
761bc2c9-0a8b-5ec0-a330-ad817e3c26ec Verified Purchase

I always use this when needed. Write details on container to leave with boiler.

Great product
5.0
February 9, 2026
Big Les 123 Verified Purchase

This product is easy to install as described on the instructions

My central heating doesn't have trapped wind any more
5.0
February 1, 2026
Timboohoohoo Verified Purchase

My central heating doesn't have trapped wind any more.

Great Sentinel product
5.0
January 27, 2026
Mick Anslow Verified Purchase

Sentinel have always provided good quality products and this one does the job.

Great item to have around
5.0
January 24, 2026
Bas Construction Verified Purchase

Does the job! Always a welcome addition when draining a heating system or cleaning out the MagnaClean filter.

Sentinel 100
5.0
January 15, 2026
Tel556 Verified Purchase

Good product. I got a flexi tap connector and drilled through the cap and put the one end on the connector and the other on the radiator.

sentinel does what it says on the tin kinda thing
5.0
January 11, 2026
NikRoc62 Verified Purchase

i have used this,yearly,for a number of years...seems to do its job..

Given 5 stars without a proper test
5.0
January 2, 2026
BIGDADDY Verified Purchase

Put in a system after I'd drained it. Quick tip for the DIYers out there. If you have a magnaflow or similar magnetic filter then use that to introduce this to the system.

Sentinel X100
5.0
January 2, 2026
DCZ Verified Purchase

Using sentinel x100 every year on my central heating system. Work well preventing radiators rusting inside.

Does exactly what it is meant to do and works well
5.0
December 19, 2025
Don the man Verified Purchase

Does exactly what it is meant to do and works well

Just works
5.0
December 10, 2025
PaulM76 Verified Purchase

Added to my radiators and forgot about it.
Not found any issues, no leaks, just seems to work.

time will tell
5.0
November 28, 2025
Kaptin Verified Purchase

time will tell but if it works as it claims for what it cost you cant go wrong

Usual Great TS service
4.0
November 27, 2025
GSII Verified Purchase

Not sure how to rate this product without draining the heating system to check whats in the water. I'm sure it foes what its supposed to do.

Central Heating System Inhibitor
5.0
November 25, 2025
louster50b Verified Purchase

Sentinel X100. Good stuff, does the job.
Excellent quality.

Great stuff
4.0
November 22, 2025
4e534c40-5170-5c10-9cfb-7bb445557786 Verified Purchase

Great stuff quieter system since I put it in. I'm convinced it makes my central heating system run more efficiently.

How easy
4.0
November 16, 2025
Dryden Verified Purchase

The product was reduced in price as tool station do from time to time, plus as always easy to order of the app and then go collect.

Difficult to say if it’s working
5.0
November 14, 2025
Scrimple2 Verified Purchase

As you can’t see this stuff working it’s difficult to say if it’s good or not, do I have black water in my rads, no do I have a lot of gas coming out of my rads, no so I assume it’s working ok.

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