X100 Inhibitor

A general purpose treatment for total protection against scale and corrosion in all types of indirect central heating systems, including those containing aluminum. Will extend the life of the system, and ensure maximum efficiency and minimum fuel usage. Once added, Sentinel X100 never needs to be replaced unless the system is drained down.

Features and Benefits

  • Heavy duty inhibitor
  • Enhanced scale and corrosion protection
  • For all system metals
  • pH neutral formulation- easy to handle
  • Ensures optimum boiler efficiency
  • Prevents boiler noise
  • Prevents pin-holing
  • Helps prevent the formation of hydrogen gas
  • A simple test kit is available to check levels
  • Harmless to the environment, completely non-toxic and biodegradable

TripleTech™ Technology
X100 Inhibitor contains, TripleTech™ Anti-Corrosion Technology - a unique formula which has three different kinds of heavy duty specialist corrosion inhibitors each of which target a specific metal-type for unrivalled performance in a multi metal system.

TripleTech Anti-Corrosion Technology has been formulated to protect against corrosion, scale, boiler noise and hydrogen gassing in all types of indirect heating systems.

The technology helps our products to outperform our closest competitors.


  • 4 x 1 Gal. case
  • 5 Gal. jug

Sentinel X100 has been formulated as a multipurpose treatment to inhibit corrosion, scale, boiler noise and hydrogen gassing in all types of indirect heating systems including those containing aluminum components.

Sentinel X100 is suitable for use in all waters, both hard and soft. The formulation is completely non-toxic.

One quart of Sentinel X100 is sufficient to treat a typical residential system of up to 25 gallons. Larger systems should be dosed at 1% of system water volume.

For best results, systems up to 6 months old should be cleansed and flushed with Sentinel X300, existing systems with Sentinel X400. If the system is already noisy due to deposits in the heat exchanger, Sentinel X200 should be added together with Sentinel X100.

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.

Physical properties
Appearance: Clear colorless to pale blue or pale yellow liquid
Odor: Mild
Specific Gravity: 1.12 (68°F)
pH (concentrate): 6.5 (approximately)
Freezing point: 27.5°F

Safety Information
Sentinel X100 Inhibitor for Central Heating Systems
An aqueous solution of inorganic and organic corrosion and scale inhibitors

Health Hazards
Not for use in potable water systems
Considered hazardous by OSHA Hazard Communication: 1910.1200, Standard - 29 CFR

Keep out of the reach of children.
Avoid contact with skin and eyes.
Wash out empty container thoroughly with water before disposal

Keep container tightly closed
Store in cool, well ventilated area

Flush spillage with plenty of water and wash to waste

Fire/Explosion Risks

Skin Exposure
After contact with skin, wash immediately with plenty of water.
If irritation develops, seek medical attention

Eye Exposure
In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
Keep eyelids apart
Seek medical advice

Rinse mouth with water
Do NOT induce vomiting!
Seek medical advice


Will Sentinel X100 protect my system if it is filled with softened water?
Softened water, is not suitable for filling a central heating system unless the water is treated with a high quality corrosion inhibitor. Unlike many other products on the market, Sentinel X100 has been especially designed to cope with all types of supply water, even softened water and affords complete protection.

How long does Sentinel X100 last in the system?
Once the correct amount of Sentinel X100 has been added, it remains in the system indefinitely, providing ongoing protection. Depletion only occurs by dilution, e.g. when the system is topped up after removing, emptying and then re-connecting radiators during house decorating. It is necessary to check the concentration of Sentinel X100 using the Sentinel Test Kit after replacement of system components (boiler, radiators etc) and replenished as necessary.

Is Sentinel X100 compatible with other brands of treatment products?
The effects on system protection and function of system components cannot be predicted when adding Sentinel X100 to a system already containing other chemical inhibitors. Therefore, it is not recommended to mix Sentinel X100 with other inhibitor products.

Can I use Sentinel X100 if I have aluminum components in my system?
Yes!! Sentinel X100 was specially developed to protect multi-metal systems, including those comprising aluminum components. Sentinel X100 protects aluminum by ensuring and maintaining neutral pH conditions.

My water pH level is about 8.0 - will the Sentinel X100 increase this?
No. Sentinel X100 contains what is known as a pH "buffer". These ingredients in the formulation are designed to actually control the pH level in the water at neutral (approx. pH 7.0), even if the pH level of the incoming water is less than 6.5 or more than pH 8.0.

What dosage should I use?
One quart of Sentinel X100 is sufficient to treat a typical residential system of up to 25 gallons. Larger systems should be dosed at 1% of system water volume.

Can I use Sentinel X100 in a Primatic Cylinder?

Options and Accessories

X100 Quick Test Kit
The Sentinel X100 Quick Test is a quick and easy way to check the level of Sentinel X100 inhibitor in a central heating system. This disposable test kit contains sufficient reagents to test a system twice.

Technical Documents

Application and Sizing Guidelines

Controlling Aluminium Corrosion

pdf 84.12 KB | December 14, 2015

Water Treatment for Condensing Boilers

pdf 86.88 KB | December 14, 2015

Literature and Performance Data

MSDS (Molybdate No. 1 Tablet)

pdf 111.33 KB | December 30, 2015

MSDS (Molybdate No. 2 Tablet)

pdf 127.32 KB | December 30, 2015

Test Kit Technical Data Sheet

pdf 108.02 KB | December 30, 2015

Water Quality in Hydronic Systems

pdf 194.03 KB | December 14, 2015

X100 Material Safety Data Sheet

pdf 91.19 KB | December 14, 2015

X100 Technical Data Sheet

pdf 103.3 KB | December 14, 2015