Central Heating Leak Sealer – Seals Hidden Leaks

Leak Sealer - Internal Central Heating Leak Repair

Vitcas Leak Sealer is a high-performance internal sealing solution designed for repairing and sealing small, inaccessible leaks and weeping joints in sealed, fully indirect central heating systems. It prevents pressure loss in the primary circuit and eliminates the need for costly repair work or system drain-down. The advanced formulation circulates freely without blocking pumps, valves, or automatic air vents.

Compatible with all standard water treatment chemicals, including corrosion inhibitors, and suitable for mixed-metal systems including aluminium. Once added to the system, it forms a soft and durable internal seal within 1 to 24 hours.

Key Features

• Internally seals minor leaks and weeping joints, helping to reduce pressure loss in sealed central heating systems

• Non-blocking formulation that is safe for pumps, valves, and automatic air vents

• Forms a soft, durable seal within 1-24 hours and remains active in the system-no flushing required

• Suitable for use in mixed-metal systems, including those containing aluminium

• Fully compatible with all standard central heating water treatment products

• Intended for use only in fully indirect central heating systems

Not suitable for PRIMATIC single-feed cylinders

For comprehensive system protection, use in conjunction with Vitcas Central Heating Inhibitor.

Dosage: 1 litre of liquid or 1 cartridge (310ml concentrate) treats up to 100 litres of system water, equivalent to approximately 10 standard radiators.

Application Instructions - Liquid Form

Preventative Use

1. Locate the central heating feed and expansion cistern
2. Shake the bottle thoroughly
3. Pour the entire contents into the cistern
4. Vitcas Leak Sealer will circulate within the system and provide full effect within 1 to 6 weeks

Emergency Use

1. Turn off the boiler and circulation pump
2. Locate a radiator fitted with a drain cock
3. Close both radiator valves and drain off approximately 2 litres of system water
4. Remove the blanking plug from the top of the radiator
5. Shake the bottle and pour the entire contents into the radiator using a funnel
6. Replace the plug, open both radiator valves, and bleed the radiator to remove any trapped air
7. Restart the boiler and pump

Application Instructions - Concentrate

1. Close both valves on a radiator and remove the bleed screw using a radiator vent key
2. Insert the supplied plastic adaptor into the bleed opening and turn clockwise to create a tight fit; trim the adaptor if needed using a craft knife
3. Cut off the domed end of the cartridge and attach it to the adaptor using a standard cartridge gun
4. Open one radiator valve and inject the entire contents of the cartridge
5. Close the valve, remove the adaptor, and replace the bleed screw
6. Open both radiator valves and bleed the radiator to remove any air

Vitcas Leak Sealer remains active in the system and does not require flushing. It has been specifically formulated not to cause blockages, while effectively sealing pressure-losing micro-leaks in heating systems.