Monarch SI-22 Scaleout Inhibitor 22mm WRAS Approved Catalytic Core Scale Prevention for Boiler and Shower

The Monarch SI-22 Scaleout Inhibitor is designed to protect plumbing and household appliances from limescale using a patented, food-grade catalytic core, housed in a durable stainless steel body. Suitable for 22mm pipework, this WRAS approved model is ideal for homes with 4–5 people.

With no power, chemicals, or maintenance required, the SI-22 provides continuous scale protection to boilers, water tanks, washing machines, dishwashers, kettles, and showers. The self-cleaning action keeps the internal media operating at peak efficiency, while the unit connects easily to all standard piping materials including copper, PVC, and galvanized steel.

Proudly made in Great Britain, the SI-22 comes with a 10-year parts warranty, offering long-term reliability and scale reduction peace of mind.

Key Features

• WRAS Approved Design – Fully compliant with UK water regulations for home installations
• Patented Catalytic Core – Unique internal core technology prevents and reduces scale build-up
• 22mm High Flow Unit – Supports medium to large homes with strong, efficient water delivery
• Self-Cleaning Function – Maintains optimal performance without user servicing
• 10-Year Warranty – Covered by Monarch’s leading parts guarantee for long-term protection

Applications

• Boiler and Hot Water System Protection – Prevents limescale damage in heating components
• Shower and Tap Scaling Reduction – Reduces buildup in water outlets for better performance
• Household Appliance Protection – Suitable for protecting washing machines, dishwashers, and kettles

Technical Specifications: