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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€24.95 Incl. 23% VAT

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Sentinel X200 Boiler Descaler 1Ltr is rated 4.6 out of 5 by 28.
Rated 5 out of 5 by from Great result!!!! My boiler system sounded like someone was hitting it with a hammer!!! I read a few reviews about X200 and thought what is there to loose. Within an hour I could hear a vast improvement and by the following day it was running normally. I fully recommend X200
Date published: 2018-04-17
Rated 5 out of 5 by from Unexpected We suffered from loud banging of the boiler and loose pipes. To be honest I wasn't sure if it was kettling / water hammer or limescale on the boiler heat exchanger. I used this product and having run the heating for around 6 hours over 3 days (2 hours per day) the boiler and pipes are completely silent. I wish I had used this 3 years ago when we moved into the house. Brilliant product. (Rather than draining your central heating system, try adding this product through your towel rail - YouTube "How To Add Inhibitor To Your Heating System Via A Heated Towel Rail" - no connection to me but I found it useful).
Date published: 2018-02-19
Rated 5 out of 5 by from Sentinel X200 I had a knocking noise from my heating pipes, I tried a cheaper brand with no results. I use this and within two hours the knocking noise had gone. The kettling as been resolved, result!
Date published: 2018-02-12
Rated 5 out of 5 by from Magic This stuff is as good as they say, cured our main heat exchanger noise in 20 minutes. Dropped the whole system added a double dose of this with new Sentinel inhibitor and it's as good as new. Should note it was previously a new boiler job due to the cost of replacement! Amazing
Date published: 2018-01-25
Rated 5 out of 5 by from Stopped Kettling My combi-boiler was ketteling (very loud noises that sounded like extremely bad water hammering) so I used this along with a litre of X100. The reaction was almost instant and the sound disappeared. I didn't fully drain or flush as the water that I drained out of the system was pretty clean, I just topped it up. In the 3 weeks since there has been 2 occasions where the kettling noise has returned, but they were very minor (i.e. quieter) and short duration (<1sec) compared to what was before (c5s). I put these minor bouts as permanent damage caused from not using these as a preventative measure. I am always going to add this into any heating system I own from now, and recommend others do to.
Date published: 2018-01-16
Rated 5 out of 5 by from Very fast results Boiler had been making increasingly loud noises for a few weeks, eventually banging so loudly when it turned off the pipes would shake. Flushing the system with system cleaner didn't help. The X200 sorted it in 2 hours. Simply added to the system via the header tank, and in no time the boiler was silent.
Date published: 2018-01-07
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
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