SESI Scale Inhibitor

• Replacement electrolytic scale inhibitor for whole-house systems – model SESI 15 (EAN 5011282050015) by Sentinel.
• Designed for 15 mm domestic pipework; installed on the rising main to reduce limescale build-up in boilers, heat exchangers, washing machines and other appliances.
• Environmentally friendly and maintenance-free: no batteries, no magnets, no chemicals required.
• WRAS approved for peace of mind and increased system longevity: helps maintain efficiency and reduce scale-related energy losses and appliance damage.
• Compact size for easy installation: approx. 195 mm length, suitable for standard 15 mm copper or plastic pipework.
• Ideal for use in homes with hard or moderately hard water; supports extended life of heat exchangers, boilers and hot water systems.

Product description Sentinel SESI 15 mm Electrolytic Scale Inhibitor – WRAS Approved Limescale Protection Overview: The Sentinel SESI 15 mm Electrolytic Scale Inhibitor provides long-term, whole-house protection against limescale. Installed directly on the incoming 15 mm mains supply, it uses a proven electrolytic process to alter the structure of calcium carbonate, preventing scale from forming inside boilers, heat exchangers, and household appliances. The SESI is environmentally friendly, maintenance-free, and requires no power or chemicals. Key Features: Protects the entire household water system from scale build-up. Maintenance-free operation – no salt, power, or chemicals required. 15 mm compression connection suitable for standard domestic pipework. WRAS approved for quality assurance and compliance. Reduces energy loss and prolongs the life of boilers and appliances. Compact and lightweight – approx. 195 mm in length. Ideal for hard and moderately hard water areas. Product Description: Designed to combat limescale in domestic water systems, the Sentinel SESI 15 mm Electrolytic Scale Inhibitor provides a simple and reliable method to protect plumbing and appliances. Once installed on the rising main, the unit treats water as it enters the property, minimising scale build-up in kettles, washing machines, dishwashers, heat exchangers, and combi or system boilers. By maintaining clean internal surfaces, it helps improve energy efficiency and extends appliance lifespan. Technical Details: Brand: Sentinel Model: SESI 15 mm EAN / GTIN: 5011282050015 Type: Electrolytic scale inhibitor / water conditioner Connection Size: 15 mm compression fittings Length: Approx. 195 mm Material: Copper alloy body with electrolytic core Certification: WRAS approved Suitable For: Whole-house protection on incoming mains Condition: New Applications: Domestic mains-fed water systems Combi and system boilers Hot water cylinders and immersion heaters Washing machines and dishwashers Areas with hard or moderately hard water Installation Notes: The SESI should be installed on the rising main after the stop tap and before any branch connections. Ensure there is sufficient straight pipe length and accessibility for fitting. Installation should be carried out by a qualified plumber or heating engineer. Benefits: Prevents costly scale-related damage. Improves heating efficiency and reduces energy bills. Extends the life of boilers, heat exchangers, and appliances. Environmentally responsible and chemical-free solution. Package Contents: 1 × Sentinel SESI 15 mm Electrolytic Scale Inhibitor (15 mm compression fittings). Note: Always verify pipe size and system configuration before installation. WRAS approval ensures suitability for potable water systems. Safety Warning Must be installed by a qualified engineer.

Must be installed by a qualified engineer.