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Product Details

Provides protection for clean central heating systems against limescale and corrosion. Suitable for use in all types of indirect central heating system, the inhibitor will extend the life of the system, ensuring maximum efficiency and minimising fuel usage.

Technical Specification
Brand Sentinel
Safety Data Sheet click here
Volume (L) 1
Delivery details
Order value: Under £10 £10 & over
Express usually Next Business Day before 6pm £5 Free
Turbo usually Next Business Day before 12 noon £10 £5
Remote areas standard delivery (2-4 days) £5 Free
Order Value: Under £25 Over £25 but less than £75 £75 & Over
£10 £5 Free

Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details
If you are using our Click & Collect service please note the following:
  • Order online or over the phone and collect in branch from 5 minutes later.
  • Ensure you check stock is available for collection at your chosen branch.
  • Check branch opening hours to ensure you have sufficient time to collect.
  • For items not available for same day collection, place order before 8pm Mon-Sat (4pm Sun) and you can collect Next Business Day (Mon-Fri) after 3pm.
  • If we have your mobile number, we’ll send you a text when your order is ready to collect.
Sentinel X100 System Inhibitor 1L is rated 4.7 out of 5 by 11.
Rated 5 out of 5 by from Keep it clean Excellent product, I have used it for years.
Date published: 2019-12-02
Rated 2 out of 5 by from We all had to wait We all had to wait while someone at the front dithered and all he wanted was a roller and brush
Date published: 2019-11-28
Rated 5 out of 5 by from Sentinel X100 Inhibitor I have added the inhibitor to my central heating system and time will tell how good it is.
Date published: 2019-11-20
Rated 5 out of 5 by from Best stuff you can get Always use Sentinel for all my central heating needs.
Date published: 2019-11-18
Rated 5 out of 5 by from Essential for Central Heating Systems I once took over a house where the CH had not been dosed. There was a 3 - 4 inch layer of sludge in the header tank. The heating barely worked. I took me nearly a week of constant flushing to clear it all out, wherupon it sprung a leak where it had corroded but he gunks had kepl it sealed.
Date published: 2019-11-09
Rated 5 out of 5 by from Inhibitor time for a drain down and clean as doing some maintenance work on CH so bought x100 again. The last lot has been in quite a while and has done a perfect job keeping the system sludge and rust free. Dont skimp on qty its well worth the value to protect the CH system (now 35 years old 8mm microbore)
Date published: 2019-11-04
Rated 5 out of 5 by from Quick & easy The wife wanted a radiator removed while she decorated so I always top up the inhibitor when I refill the system afterwards. Cheap, quick & easy way to redose your heating system
Date published: 2019-10-30
Rated 5 out of 5 by from No complaints Well it's a central heating inhibitor . Gets good reviews and is recommended by the manufacturer of my boiler. System seems quiet with very little gas. Seems to do what it says on the tin. Good price at Toolstation too.
Date published: 2019-10-29
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