Fernox F4 Leak Sealer 500ml
Seal Small Internal Heating System Leaks Without Draining the System
A small leak in your central heating system can lead to falling boiler pressure, cold radiators and expensive repair bills. Fernox F4 Leak Sealer 500ml offers a fast and effective way to seal minor internal leaks without draining the system or removing pipework.
Designed for sealed domestic central heating systems, Fernox F4 circulates through the system until it reaches the source of the leak. Once it finds the leak, it forms a durable seal that helps restore system pressure and reduce ongoing water loss. As a result, many small leaks can be repaired quickly without disruptive or costly work.
Fernox F4 works particularly well on inaccessible leaks hidden beneath floors or within pipework where locating the exact source would normally require major investigation. Instead of lifting floors or opening walls, this specialist leak sealer can often provide an effective solution while keeping disruption to a minimum.
The easy-to-use 500ml bottle treats typical domestic heating systems and works with all commonly used metals and materials found within central heating installations. It also remains compatible with other Fernox water treatment products, making it an excellent addition to routine heating system maintenance.
Manufactured by Fernox, one of the UK’s leading heating water treatment specialists, F4 Leak Sealer gives homeowners and heating engineers a trusted solution for sealing minor internal leaks while extending the life of the heating system.
KEY FEATURES
- Seals small internal central heating leaks
- No need to drain the heating system
- Helps restore lost system pressure
- Reduces costly repair work
- Ideal for inaccessible pipework leaks
- Fast and easy application
- Compatible with Fernox Protectors and Cleaners
- Suitable for sealed domestic central heating systems
- 500ml bottle treats a typical domestic system
- Trusted Fernox quality
TECHNICAL SPECIFICATIONS
| Specification | Details |
|---|---|
| Brand | Fernox |
| Product | F4 Leak Sealer |
| Size | 500ml |
| Application | Internal heating system leak sealing |
| Suitable For | Sealed domestic central heating systems |
| Compatible With | All common heating system metals and materials |
| Manufacturer | Fernox |
THE PROBLEM IT SOLVES
Small internal leaks often cause boiler pressure to drop without any visible signs of water escaping. Finding these hidden leaks can involve lifting floors, removing ceilings or opening walls.
Fernox F4 Leak Sealer offers a simpler solution. It circulates through the heating system and seals many minor internal leaks from within, helping restore pressure while avoiding unnecessary disruption.
WHY CHOOSE FERNOX F4 LEAK SEALER?
When a heating system keeps losing pressure, replacing pipework isn’t always the first answer. Fernox F4 provides a proven way to seal many small internal leaks quickly and efficiently.
Its specialist formula works while the system continues to operate, making it an ideal choice for homeowners and heating engineers looking for a practical, cost-effective repair.
PERFECT FOR
✔ Central heating systems losing pressure
✔ Hidden pipework leaks
✔ Boiler servicing
✔ Heating engineers
✔ Landlords
✔ Homeowners
✔ Routine heating maintenance
✔ Domestic heating repairs
WHEN SHOULD I USE THIS PRODUCT?
Use Fernox F4 Leak Sealer when your sealed central heating system loses pressure because of a suspected minor internal leak.
It works particularly well where the leak cannot be located easily and where draining or dismantling the heating system would involve significant time or expense.
Important: Fernox F4 is designed for minor internal leaks only. It is not suitable for repairing visible external leaks, damaged pipework or faulty components that require replacement.
WHY BUY FROM KUDOS TRADING?
- Genuine Fernox products
- Competitive UK prices
- Fast nationwide delivery
- Expert technical support
- Trusted supplier for plumbing, heating and underfloor heating products
- Extensive range of quality products in stock
- Excellent customer service before and after your purchase
COMPATIBLE PRODUCTS
- Fernox F1 Protector
- Fernox F3 Cleaner
- Fernox Filter Fluid+
- Magnetic System Filters
- Central Heating Chemicals
- Radiator Valves
- Filling Loop Kits
Next Working Day Delivery: Yes, we hold all our products in stock at our 7000 sq ft Nottingham warehouse and at our 3000 sq ft warehouse in Market Harborough and use DPD for a tracked next-day delivery.
Collection Available: You can always collect from our Nottingham location and help yourself to a free tea and coffee.
