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Sentinel X200 Boiler Descaler 1Ltr Product Code: 43140

1Ltr. A unique, life-long system treatment for the elimination of limescale and boiler noise. Reduces fuel usage. Safe to use in all types of indirect central heating systems. Non-acidic.


  • Restores Boiler Efficiency
  • Eliminates Kettling
  • No Need to Flush - Stays in System
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Safety Data Sheet
Additional Information
Technical Specification
  • Brand : Sentinel
  • Product Type : Boiler Descaler
  • Volume : 1 Ltr
  • Model No : X200
  • Pack Size : 1
  • Manufacturer Guarantee : 1 Year Guarantee
  • Pieces in Pack/Case : 1
Product Contents
Delivery & Returns


Standard delivery service up to 3 working days: €8.95

Free delivery on all orders over €70.00

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Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


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€23.95 Incl. 23% VAT

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Sentinel X200 Boiler Descaler 1Ltr is rated 4.5 out of 5 by 22.
Rated 5 out of 5 by from Impressive stuff This stuff is very impressive and had an almost instant effect on my system which used to kettle and whine. It is now much quieter and cycles as it should without sounding like it may blow up anytime. It has probably added years to the life of my boiler.
Date published: 2017-10-31
Rated 4 out of 5 by from Used to reduce noice in UFH Used this to help reduce the noise in an UFH manifold. It helped but didn't eliminate the noice completely. Added some X100 later than that did the job much better, and was cheaper.
Date published: 2017-08-17
Rated 5 out of 5 by from Peace and quiet at last. Was recommended this product as my boiler every morning when starting up would make a brass band sound quiet. So I added this product to my system and after a couple of days the noise had stopped. So it's back to the alarm clock.
Date published: 2017-04-11
Rated 5 out of 5 by from Worked straight away! Cleaned out the header tank and added this along with X100 then topped up with water. The radiators now get much hotter and the boiler is quieter too. It didn't take long & I saw an immediate difference.The only negative was the fact that Screwfix use Parcelforce & they did not deliver to me but the post office for one order & to someone I'd never heard of for another despite the fact that I'm working from home & in!
Date published: 2017-03-30
Rated 4 out of 5 by from Great Product I have used this several times on customers boilers and it has worked, but it will not always work. However, it is the only one that will if it can. Try it, it does work but takes time.
Date published: 2016-12-04
Rated 5 out of 5 by from Koncked Knocking Stopped severe knocking on the head in one day. "plumber professionals" quoted several hundred pounds to replace heat exchanger and flush system ... I knew the latter was rubbish as the rads are two years old and system was clean with Magnaclean and X100 stabiliser. Added 1/2 litre of X200 to magnaclean filter, then ran HOT water only for 20 minutes (shorter run and no need to dilute in rads yet). After this Ran CH system 20 minutes. Repeated the above steps 3 more time. Total of 2 litres used in a 18 radiator system. This was 6 months ago, no noise or knocking since.
Date published: 2016-11-25
Rated 5 out of 5 by from Sentinel X200 stops noise Added to my towel rail as it's easy to isolate. Added 500ML incase needed another treatment, but turned on central heating to circulate and within 30 mins the kettling sound from the boiler had ceased. Am now waiting for tonight when the central heating / water cuts on again and the boiler will run.
Date published: 2016-10-15
Rated 5 out of 5 by from Worked like magic I now have a silent boiler, after a few hours of adding the product to the header tank!
Date published: 2015-12-15
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