The Sentinel X300 Universal Cleaner (MPN X300) is a powerful, heavy-duty cleaner specifically designed for new central heating systems up to six months old, where installation debris such as flux residue, swarf, and manufacturing grease can hinder even heat distribution. Circulated at first fill, X300 passivates metal surfaces and prevents harmful copper deposition, preparing the system properly for long-term protection with Sentinel X100 Inhibitor.
1 Hour
Min Circulation Time
Up to 10 Radiators
Coverage
New Systems Only
Sentinel X300 is only suitable for heating systems up to 6 months old. Older or existing systems should instead be cleaned with Sentinel X400 or Sentinel X800, which are formulated for established sludge and debris rather than fresh installation contamination.
BS 7593 Compliance
Best practice, reflected in guidance such as the UK Building Regulations Part L Domestic Heating Compliance Guide, is that a new central heating system should be thoroughly cleaned and flushed before commissioning. Systems should be cleaned in accordance with BS 7593.
Circulation Window
Circulate for a minimum of 1 hour, up to a maximum of 24 hours, at normal operating temperature with all valves open. The system should be flushed with clean water immediately after use, and not left circulating indefinitely.
Removes Installation Debris
Flushes out swarf, flux residue, grit, sand and manufacturing grease commonly introduced during the installation of a new central heating system.
Prevents Copper Deposition
Helps prevent harmful copper deposits being left in the system, a frequent cause of severe pin-hole corrosion in radiators further down the line.
Eliminates Corrosive Flux Residue
Removes corrosive flux residues from soldered joints that could otherwise give rise to rapid pin-holing corrosion if left in circulation.
Passivates Metal Surfaces
As it cleans, X300 passivates the metal surfaces of the system, helping protect components as the system is prepared for inhibitor treatment.
Prepares System for X100
Designed as the ideal preparation step before Sentinel X100 Inhibitor, ensuring the inhibitor is protecting genuinely clean surfaces rather than sealing in installation debris.
Suitable for Aluminium Systems
A neutral formulation safe for use in all types of indirect heating system, including those with aluminium components.
| Product Identity |
| Manufacturer |
Sentinel (Sentinel Performance Solutions) |
| Product Name |
Sentinel X300 Universal Cleaner (New System Cleaner) |
| MPN |
X300 |
| Technical Data |
| Minimum Circulation Period |
1 hour |
| Maximum Circulation Period |
24 hours (do not exceed) |
| pH (Concentrate) |
Approx. 6.7 |
| Freezing Point |
-14°C |
| Volume |
1 L |
| Dosage & Application |
| Standard Treatment |
1 litre per typical domestic system of up to 10 radiators |
| Suitable Systems |
New systems, or those up to 6 months old |
| Circulation Conditions |
Normal operating temperature, all valves open |
| Post-Use |
Flush system with clean water immediately after use |
| Compliance & Compatibility |
| Standard Referenced |
BS 7593 |
| System Types |
All types of indirect heating system, including aluminium |
| Next Step |
Prepare system for Sentinel X100 Inhibitor |
Can I use X300 on an older, existing system?
No. Sentinel X300 is only suitable for systems up to 6 months old. Existing systems should be cleaned with Sentinel X400 or Sentinel X800 instead.
How long should I circulate X300 for?
Circulate for a minimum of 1 hour at normal operating temperature with all valves open, up to a maximum of 24 hours. Flush the system with clean water immediately afterwards.
What does X300 actually remove?
It removes installation debris including flux residue, swarf, grit, sand and manufacturing grease left over from the installation process.
Do I need anything after using X300?
Yes. After flushing, the system should be treated with Sentinel X100 Inhibitor to provide ongoing corrosion and scale protection.
How much X300 do I need?
1 litre treats a typical domestic system of up to 10 radiators. Larger systems require proportionally more product.
Is X300 compliant with UK best practice guidance?
Yes, it is designed to support cleaning in accordance with BS 7593 and the UK Building Regulations Part L Domestic Heating Compliance Guide.
