• Complete Radiator Protection Kit: Includes Fernox F1 central heating inhibitor and Fernox F8 power cleaner – dual action to flush sludge and protect against rust, scale, and corrosion in UK heating systems
• Radiator Cleaner for Heavy Sludge: Fernox F8 Power Cleaner removes sludge, limescale, and corrosion debris using a fast-acting, non-toxic, citrate-based formula that accelerates powerflush or manual flushes
• Long-Term Inhibitor Protection: Fernox F1 central heating inhibitor prevents corrosion and scale in mixed metal systems, maintaining efficiency and reducing boiler maintenance costs and energy bills
• Energy Efficiency and Cost Savings: Boost system performance by restoring circulation and reducing cold spots – clean, well-inhibited systems can cut heating gas use by up to 15%, saving money on energy bills
• Safe and Non-Acidic Formula: Both F1 and F8 are pH neutral, non-foaming, and compatible with all metals including aluminium – supporting BS 7593:2019 best practice and safe for use with softened water
• Covers Up to 130 Litres or 16 Radiators: Each 500 ml bottle treats up to 130 litres or 16 radiators (250 m² of underfloor heating) – suitable for 97% of UK homes; ideal for sealed and open vented systems

The LavaTap – Fernox F1 & F8 Central Heating Treatment Combo is your complete solution for cleaning and protecting domestic heating systems. Whether you're dealing with persistent sludge, poor flow, or preparing a new installation, this powerful twin-pack restores system efficiency and helps prolong boiler and radiator life.

Fernox F8 Power Cleaner is a high-strength, fast-acting radiator cleaner that removes sludge, corrosion debris, and limescale without the need for neutralisation. Its citrate-based, non-acidic formula is ideal for powerflush, manual or magnetic flushes, and safe for use with all metals including aluminium. It works rapidly to dislodge hardened internal deposits and improve system circulation. Use during servicing or retrofitting to clear blockages and prepare systems for inhibitor treatment.

After cleaning, apply Fernox F1 Inhibitor, the UK’s trusted solution for corrosion and limescale prevention. F1 uses a multi-action blend of organic, anodic and cathodic inhibitors to form a durable barrier inside the system. It also regulates pH between 6.5 and 8.5, helping to stabilise water chemistry and reduce ongoing maintenance needs. The result is quieter operation, faster heating, and long-term protection that complies with BS 7593:2019.

Together, these two products support optimal system efficiency. When used in accordance with best practice, they can deliver gas savings of up to 15%, reduce cold spots, and eliminate the need for frequent venting. Safe for use with softened and deionised water, this combo is suitable for all boiler types, underfloor heating circuits, and both sealed and open vented systems.

Each 500 ml bottle treats up to 130 litres or 16 radiators (250 m² of underfloor heating) – covering 97% of UK homes. Whether you're a professional installer or a DIY user, this radiator flush and inhibitor kit is the proven way to clean, protect, and optimise your heating system year-round.

Using Fernox F8 alone will clean out sludge and restore flow, but without protection, rust and limescale can return quickly — especially in mixed-metal systems. By following up with Fernox F1, you prevent future build-up, maintain stable pH, and protect your boiler and radiators long term. This clean + protect approach helps extend system life, reduce maintenance, and deliver energy savings of up to 15% on your gas bill, every time you heat your home. It also ensures compliance with BS 7593:2019, the industry standard for heating system maintenance in the UK.