For new heating systems

Specifically designed for cleaning new closed loop hydronic heating systems, Sentinel X300 System Cleaner is a powerful, heavy-duty cleaner for the removal of installation debris and grease. This prepares the system for the addition of an inhibitor, which will protect the system components and prolong their effective life.

Key features

  • Cleans new heating systems (up to 6 months old)
  • Powerful, heavy duty cleaning action
  • Removes installation debris
  • Washes off manufacturing greases
  • Eliminates corrosive flux residue
  • Prevents harmful copper deposits being left in the system
  • Prepares system for protection with X100 Inhibitor

Available sizes

1 Quart bottle
1 Gallon container
5 Gallon container

Contamination of a new closed loop hydronic heating system is common, with metal swarf, grits and sands, and excessive flux being introduced during the installation process. In addition to this, layers of grease or oil will be present on new components such as on the internal faces of radiators. The presence of this debris and these residues inside the system can lead to rapid pin-hole corrosion of the radiators.

Using X300 System Cleaner:

1 quart of Sentinel X300 is sufficient to treat a typical residential system of 25 gallon. Larger systems should be dosed at 1% of system water. If the system is new, this should be at the time it is first filled. For best results, the water should be circulated at normal operating temperature for between 1-2 hours but no longer than 24 hours.

If it is not possible to heat the water, the circulation time must be compensated for by extending the time to at least 24 hours but no longer than one week.

Drain and flush the system before refilling and treating 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.