We protect hydronic heating systems by providing best practice solutions and products internationally.

We have a comprehensive range of products supported by approachable experts to help you achieve best practice protection for domestic and commercial systems, protecting against limescale, corrosion and accompanying problems which can cause inefficiency or failure.


Keep customers warm and happy by cleaning, protecting and maintaining domestic closed loop hydronic heating systems.

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Domestic engineer working on boiler


Got a question? We've developed a comprehensive support section, featuring FAQs, how-to guides and videos.

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Support Centre

OEM Endorsement

The relationships we have with heating industry manufacturers extends beyond our reputation for quality products which perform effectively .

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Domestic Engineer

Video: Best Practice Water Treatment

This short video introduces The Sentinel System, demonstrating water treatment best practice for optimum central heating efficiency and protection.

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Sentinel Video on Best Practice Water Treatment

Latest News

Keep up to date with the water treatment world and all things Sentinel. You can find all of our most recent updates in one place; from press releases and case studies to events and our latest blog posts.

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Best Practice Video