The Fernox F4 Leak Sealer is a fast, reliable solution designed to seal small leaks in sealed central heating systems. It works internally, meaning there is no need to drain the system or dismantle pipework. As a result, it saves both time and money while restoring system efficiency.
Designed for use by both installers and homeowners, Fernox F4 Leak Sealer provides a permanent repair to inaccessible leaks. Therefore, it is ideal for modern heating systems where pipework is concealed within walls or floors.
Fernox F4 Leak Sealer is a high-performance internal sealing compound formulated to target minor leaks and weeps. Once added to the system, it circulates with the heating water and automatically seeks out pressure loss points. Consequently, it forms a durable seal only where needed.
Unlike temporary fixes, Fernox F4 creates a long-lasting repair without affecting normal system operation. In addition, it remains flexible under heat and pressure changes.
How Fernox F4 Leak Sealer Works
When introduced into the heating system, Fernox F4 Leak Sealer remains suspended in the water. As it reaches areas where water escapes, the product reacts with air and heat. Therefore, it solidifies precisely at the leak point.
Because of this targeted action, Fernox F4 does not clog radiators, pumps, or valves. Instead, it seals leaks discreetly while allowing the system to continue running normally
Seals Leaks Without Draining
Fernox F4 Leak Sealer can be added directly to a live heating system. As a result, there is no need to drain down or shut off heating for extended periods. This makes it a practical choice for urgent repairs.
Compatible with All Heating Systems
The product is suitable for use in sealed and open-vented central heating systems. Additionally, it is compatible with aluminium radiators, plastic pipework, and all common metals. Therefore, it works safely across a wide range of installations.
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.
