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Fernox F4 Central Heating Leak Sealer 500ml

Fernox F4 Central Heating Leak Sealer 500ml

Seals small leaks and weeps which may cause pressure loss and/or boiler breakdown. An internal lea...

Best current price£19.00from B&Q

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B&QB&Q - F4 Internal Leak SealerBottle 500Ml
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City Plumbing GBFernox Leak Sealer F4 500Ml 56603 Mcp
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HSS HireFernox Green F4 Leak Sealer 500Ml
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AmazonFernox Red Central Heating Leak Sealer F4 500Ml
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Travis PerkinsFernox F4 Central Heating Leak Sealer 500ml
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Product Information

Full details

This guide is for homeowners and heating engineers looking to address small leaks in their central heating systems. The Fernox F4 Central Heating Leak Sealer offers an effective solution to seal minor leaks and weeps, preventing pressure loss and potential boiler breakdowns. However, it's important to note that this product is designed for small, inaccessible leaks and may not be effective for significant damage.

All features

ColourRed
Model Part Number56603
BrandFernox

Extended Product Information

FAQs

How much Fernox F4 do I need?

One 500ml bottle treats up to 130 liters of system water (typically up to 16 radiators).

How long does it take to work?

The product is effective within 1-24 hours after application.

Can I use Fernox F4 in a sealed system?

Yes, it is designed for use in both sealed and open-vented central heating systems.

Is it safe for my boiler?

Yes, it is formulated to prevent blockages in the boiler and is compatible with all common boiler materials.

Do I need to drain the system before use?

No, a full drain-down is usually not necessary. The product can be added directly to the system.

How do I add the product to my system?

You can add it through the filling loop or a radiator, following the instructions on the bottle.

Will it damage pumps or other components?

No, the product is designed not to damage pumps or other vulnerable components.

Troubleshooting

Pressure loss continues after application.

The leak may be too large for the product to seal. Check for visible leaks and consider professional repair. Ensure correct application of the product.

System components are blocked.

Ensure the system is flushed before and after application, if recommended by the system's manufacturer. Check system components such as pumps and valves for any blockage.

Poor performance after application.

Ensure proper circulation of the product throughout the system. Check for any airlocks or blockages within the system.

Pros and Cons

Pros

  • Effective at sealing small, inaccessible leaks.
  • Reduces pressure loss in sealed systems.
  • Compatible with all common central heating system materials.
  • Quickly seals leaks, often within 24 hours.
  • Avoids the need for a full system drain-down in many cases.

Cons

  • Not suitable for large or severe leaks.
  • May not be effective if the leak is caused by significant corrosion.
  • Results can vary depending on the size and location of the leak.
  • Requires proper system preparation for optimal performance.
  • The product will not fix pre-existing system issues or corrosion.

Setup, Compatibility & Care

  1. Preparation: Turn off your central heating system and allow it to cool down.
  2. Access: Locate the filling loop or a suitable point to introduce the product into the system.
  3. Application: Shake the Fernox F4 bottle well before use. Add the appropriate amount to the system according to the instructions on the bottle (usually through the filling loop or a radiator).
  4. Circulation: Turn on the central heating system and allow the product to circulate for at least 1-24 hours. This allows the sealant to reach the leaks.
  5. Monitoring: Regularly check the system pressure to monitor the effectiveness of the sealant. Continue to monitor pressure for the next few days to confirm if the leak is sealed.

Compatibility: The product is compatible with all metals and materials used in central heating systems, including steel, copper, and plastic.

Care: Store the product in a cool, dry place. Avoid contact with skin and eyes. Follow the safety instructions on the product label.

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