• Dual-action kit with Fernox F1 and F7 protection: Complete chemical treatment for low temperature central heating systems such as heat pumps and underfloor heating which are prone to biofilm risk. Combining a corrosion inhibitor and biocide to prevent rust, scale, sludge, bacteria, fungi, and algae
• Treats up to 130 litres or 250 m² of underfloor heating: This 2-part kit treats systems up to 130 litres — enough for 16 radiators or 250 m² of underfloor heating, providing whole-system protection from corrosion and microbial buildup
• Supports energy savings through efficient system performance:Helps reduce gas usage and heating costs by maintaining optimal flow, improving radiator heat output, and minimising energy waste from corrosion, sludge, and microbial fouling
• Ideal for closed-loop and underfloor heating systems: Specially formulated for sealed systems and low-flow circuits where biological contamination and scaling are more likely to disrupt performance and water quality
• Compatible with all system metals and Fernox products:Safe for use in aluminium and mixed-metal pipework, and works alongside Fernox cleaners, flushes, and leak sealers for comprehensive heating system maintenance
• Reduces maintenance and extends system lifespan:Minimises costly repairs and downtime by preventing build-up that can block pipes, damage components, and reduce system reliability over time

The LavaTap Fernox F1 & F7 Central Heating Treatment Kit is a complete chemical treatment designed to protect and optimise the performance of domestic and light commercial heating systems. This 2-part solution includes Fernox F1 Central Heating Inhibitor (500 ml) and Fernox F7 Biocide (200 ml) — together delivering essential protection against corrosion, limescale, sludge, bacteria, algae, and fungi.

Treating up to 130 litres of system water, this kit is ideal for systems with up to 16 radiators or approximately 250 m² of underfloor heating. The Fernox F1 inhibitor prevents metal corrosion and scale build-up, maintaining proper pH levels and extending the life of boilers and pipework. The Fernox F7 biocide eliminates biological contamination, tackling biofilms and microbial fouling in closed-loop and low-circulation systems like underfloor heating.

Used together, they help restore and maintain heat transfer, improve radiator circulation, reduce system noise, and lower energy consumption by keeping your system clean and free of obstructions. These benefits translate directly into more consistent heating, lower gas usage, and long-term cost savings.

The kit is suitable for use with both sealed and open vented systems, and is compatible with all major pipework materials including aluminium. It can be used alongside Fernox flushes, leak sealers, and magnetic filters for full-spectrum maintenance. This is a complete chemical treatment for central heating systems, perfect for post-installation care or routine protection — ensuring long-term performance, reliability, and peace of mind.