Fernox Cleaner F3 265ml
In-stock orders before 2pm Mon–Fri normally dispatch the same day. Orders after 2pm, at weekends or on bank holidays normally dispatch the next working day.
Working days exclude UK bank holidays. Delivery times are estimates.
📦 £3.99 UK delivery • FREE on qualifying orders over £30
🔒 Secure checkout • 30-day returns
Restore heating efficiency and improve system performance with Fernox Cleaner F3.
Clean and protect in one order
Consider the Central Heating System Protection Kit instead of this single bottle if you also need F1 inhibitor, PTFE tape and a bleed key. Follow the manufacturer’s cleaning, flushing and dosing instructions.
Free UK delivery on qualifying orders over £30.
Fernox Cleaner F3 is a powerful, fast-acting central heating system cleaner designed to remove sludge, debris, flux residues and limescale from existing heating systems. Regular cleaning helps improve circulation, restore radiator performance and increase boiler efficiency.
Trusted by professional heating engineers throughout the UK, Fernox F3 is suitable for all mixed-metal central heating systems and can be used before adding Fernox Protector F1 for long-term protection.
Key Features
✔ Removes sludge, scale and debris
✔ Restores heating efficiency
✔ Improves radiator performance
✔ Helps reduce boiler noise
✔ Compatible with all metals and materials commonly used in heating systems
✔ Suitable for existing and older systems
✔ Treats systems up to 100 litres
Benefits
Fernox Cleaner F3 helps restore circulation within central heating systems, reducing cold spots in radiators and improving overall heating performance. It is ideal when carrying out boiler replacements, system upgrades or routine maintenance.
Suitable For
- Combi Boilers
- System Boilers
- Conventional Heating Systems
- Radiators
- Underfloor Heating Systems
- Existing Heating Systems
Specifications
- Brand: Fernox
- Product: Cleaner F3
- Size: 265ml
- Type: Central Heating Cleaner
- Treatment Capacity: Up to 100 Litres
Package Includes
- 1 x Fernox Cleaner F3 265ml Bottle