Sentinel is a company with a clear goal: offer water treatment products and services that provide the best lifetime protection for heating and hot water systems - CleanProtect and Maintain.


  • "Cleaning a dirty central heating system could save you £124 every year"
  • The Compliance Guide to Part L of the UK Building Regulations now states that when installing a boiler onto a new or existing central heating system, the system should be thoroughly cleaned.
  • Cleaning a new system will remove any installation debris and flux residues which if left inside the system will cause corrosion.
  • Restoring an old system will remove sludge build-up, improving the efficiency of the system and help save on fuel costs.




  • "The absence of correct water treatment can reduce system effectiveness by typically 15%"
  • After cleaning, it is important to protect your system from returning scale, corrosion and sludge build-up.
  • Both chemical inhibitors and physical system filters are proven to provide ongoing protection for the life of the system

      Vortex Filter  

Shop Vortex Filters

         Scale Reducer


Shop Scale Reducers

        X100


Shop X100 Inhibitor




  • "1 in 5 households in the UK have suffered a heating breakdown"
  • It is important to ensure that once a system is cleaned and protected it is maintained on an annual basis.
  • Many factors can reduce the level of protection of a central heating system, for instance system water losses by the removal of a radiator whilst decorating. We therefore advise checking the quality of water and level of protection annually.

      Leak Sealer  

Shop Leak Sealer

         X200


Shop X200 Noise Reducer

         Test Kit


Shop Test Kits