A non-acid, leave-in treatment for boiler noise

Living with a noisy boiler is not only unpleasant, but it can also be inefficient. A number of factors can cause boiler noise in closed loop hydronic heating systems, but it is most often caused by a thin layer of deposit on the heat exchanger. Sentinel X200 Noise Reducer is extremely effective in solving this problem, whilst simultaneously helping to restore boiler efficiency.

Key features

  • Reduces boiler noise
  • Helps restore boiler efficiency
  • Easy to handle
  • Simple to dose
  • Suitable for all metals including aluminium
  • Non-acid, non-corrosive
  • Manufactured under a quality system confirming to IOS9001

Boiler noise is an inconvenience for homeowners and can be an indicator of an underlying problem with the heating system such as system design or mechanical faults. Once these have been ruled out as the cause of boiler noise the most common cause is a thin layer of limescale or other deposit inside the boiler. Sentinel X200 Noise Reducer is a highly successful treatment for curing the problem.

It is a non-acid, leave-in treatment; a gentler but still highly effective solution to this common problem. Treating boiler noise caused by deposits with Sentinel X200 Noise Reducer will also help to restore boiler efficiency.


1 Quart or 1 275ml/9.3fl oz cartridge of Sentinel X200 is sufficient to treat a typical residential system of 25 Gallons. Larger systems should be dosed at 1% of system water.

The time taken for boiler noise to reduce or be entirely eliminated will depend on the hardness and quantity of limescale present. In severe cases, a further dose of Sentinel X200 may be necessary. Sentinel X200 should be left in the system. The system water should also be treated with Sentinel X100 Inhibitor or Sentinel X500 Inhibited Antifreeze.

Open systems: Dose via F&E cistern, via a by-pass feeder or use a dosing vessel.

Sealed systems: If the system is empty, add to any convenient point before filling. If full, use a dosing vessel to inject via the filling loop or other access point.

When using a concentrate cartridge, the product may be added directly to the heating system either via an air bleed valve, or via the fill loop using the appropriate adaptor and a suitable caulk gun.