Fernox

Fernox Biocide F7 200ml is a high-performance biocide designed to prevent bacterial contamination and fungal growth in underfloor heating, low-temperature heating and chilled systems.

It also helps clean and prevent the recurrence of microbiological fouling, including jelly-like deposits caused by fungal growth in feed and expansion cisterns. Biocide F7 starts working within 24 hours and provides both short-term disinfectant action and longer-term preservation.

One 200ml bottle treats up to 150 litres of system volume or up to 280m² of underfloor heating. Fernox recommends using Biocide F7 alongside a Fernox Protector, such as Protector F1, to provide protection against corrosion and scale.

Fernox Cleaner F3 is a universal, pH-neutral central heating system cleaner designed to remove sludge, limescale and other debris from domestic heating systems.

It is suitable for both new and existing central heating systems and can be used as part of a system clean or prior to installing a new boiler. F3 is non-foaming and compatible with all common heating system materials, including aluminium.

One 500ml bottle treats up to 130 litres of system water, equivalent to approximately 16 radiators or 250m² of underfloor heating.

Fernox Leak Sealer F4 is an internal leak sealer designed for use in central heating systems to seal small, inaccessible leaks and weeps that can cause pressure loss and boiler breakdowns.

Once added to the heating system, F4 circulates through the system and seeks out areas where oxygen is entering through microscopic leaks. It then forms a polymer seal around the affected area, helping to stop the leak without the need to drain down the entire system.

Fernox F4 is effective within 1 to 24 hours and is designed to remain permanently in the system. It is compatible with all common heating system metals and materials, including aluminium, and is formulated not to cause blockages or restrictions in vulnerable components such as pumps, air vents and heat exchangers.

One 500ml bottle treats up to 130 litres of system water, equivalent to up to 16 radiators or 250m² of underfloor heating.

Fernox Protector F1 500ml is a high-performance central heating inhibitor designed to provide long-term protection against corrosion and limescale formation in domestic heating systems.

It combines multiple corrosion and scale inhibitors to protect the metals within the heating system and help prevent the formation of damaging sludge and deposits. Enhanced pH buffering helps maintain system water between pH 6.5 and 8.5, the optimum range for protecting mixed-metal heating systems.

One 500ml bottle treats a heating system of up to 130 litres, 16 radiators or 250m² of underfloor heating. Protector F1 is suitable for all types of boilers, radiators and pipework systems and is compatible with commonly used heating system materials, including aluminium.

For best results, contaminated systems should be cleaned and flushed before adding Protector F1. Fernox recommends checking inhibitor concentration annually as part of routine boiler or heating system servicing.

The Fernox TF1 Sigma HP Filter 28mm With Valves is a high-performance system filter specifically designed to protect air source and ground source heat pump systems from circulating debris and contaminants.

Using Fernox's unique filtration technology, the TF1 Sigma HP Filter is designed to capture a wide range of system debris, including magnetic and non-magnetic contaminants, even at the high flow rates typical of heat pump installations. It is designed to maintain low pressure loss and help the heat pump operate efficiently.

The filter is supplied with 28mm full-bore valves as standard, helping to minimise flow restriction through the filter assembly. It can be installed horizontally or vertically and is ideally fitted on the return pipe to the heat pump. Where space is restricted, it can also be installed up to 45° from vertical.

Cleaning is quick and straightforward through the drain valve, without needing to dismantle the filter or shut down the system. The sealed filter design also reduces ongoing maintenance requirements.

The TF1 Sigma HP is compatible with water, inhibited glycol solutions and Fernox system additives, with a maximum glycol concentration of 50%.

The Fernox TF1 Sigma UB Filter is a compact 22mm magnetic heating system filter designed for installation underneath boilers and in restricted spaces where a conventional in-line filter may not be suitable.

The under-boiler design features a durable glass-reinforced engineering polymer filter body and a forged brass manifold, providing a robust solution for protecting heating systems from circulating corrosion debris, including magnetite.

A powerful neodymium magnet captures ferrous contaminants from the system water, while the engineered flow path is designed to provide high collection efficiency without blocking or restricting flow. The integrated three-way valve allows the filter to be isolated and cleaned through the drain point without dismantling the filter.

Designed to be installed horizontally on the return to the boiler, the TF1 Sigma UB is particularly useful where space is limited or pipework is concealed. Separate flexible or corrugated pipes and/or adapters may be required for some installations and are not supplied.

Fernox Water Hawk is a pipe jointing compound specifically designed for use with hot and cold potable water. Its non-toxic formulation is WRAS approved, making it suitable for plumbing applications where the jointing compound comes into contact with drinking water.

Water Hawk is also suitable for use with natural gas, steam, air excluding medical lines, brine, alcohol and LPG. It can be applied directly to pipework up to 25mm in diameter. For larger pipework over 25mm, Fernox recommends using the compound with an approved reinforcing fibre.

The silicone-based compound is designed not to support microbiological growth, making it particularly suitable for potable water systems. It complies with BS EN 751-2 Class A for the applicable jointing applications.

The Fernox Electrolytic Scale Reducer 22mm Compression is an in-line water treatment device designed to help prevent the build-up of limescale throughout the home.

Using electrolytic principles, it alters the structure of hardness salts in the water, encouraging them to coagulate and helping reduce the formation of scale in appliances and hot water systems. It provides whole-house protection against limescale and is effective immediately after installation.

The scale reducer is maintenance-free and can be installed on horizontal or vertical pipework using 22mm compression fittings. Under average domestic water usage, it can remain effective for up to 10 years, depending on water usage levels.

The unit is made from forged, nickel-plated brass and is WRAS approved. It is pressure rated to 10 bar at 20°C and is designed for cold feed applications.

Fernox Antifreeze Protector Alphi-11 is a combined antifreeze and corrosion inhibitor designed to protect domestic central heating systems against freezing, internal corrosion and limescale formation.

Alphi-11 contains mono-propylene glycol and provides frost protection while helping to maintain the long-term efficiency and lifespan of the heating system. It is suitable for use with all common heating system metals and materials, including aluminium.

A minimum in-use concentration of 25% is recommended to provide adequate corrosion protection. At this concentration, Alphi-11 provides frost protection down to -11°C. Increasing the concentration to 40% provides protection down to -22°C.

Alphi-11 is suitable for heating and chilled-water systems and is compatible with other Fernox products. For new or untreated systems, Fernox recommends thoroughly cleaning and flushing the system with Fernox Cleaner F3 before adding Alphi-11.

Fernox LS-X is a fast-acting silicone paste designed to seal external leaks and joints on hot and cold water services. It is particularly useful for repairing leaks around compression joints and screwed fittings without the need for mixing or specialist preparation.

The ready-to-use paste remains flexible rather than setting rock hard, allowing joints to be dismantled when required. It does not shrink or crack with age and can be used across a wide temperature range, from below freezing to above the boiling point of water.

LS-X can also be used as a jointing compound on hot and cold water services, including potable water. For larger leaks or higher pressures, Fernox recommends reinforcing the repair with PTFE or another suitable reinforcement tape.

Fernox Hawk White 400g is a general-purpose pipe jointing compound designed for sealing threaded metallic pipe joints and fittings.

It is suitable for use with natural gas, non-potable water, steam, air excluding medical lines, brine, alcohol and LPG. Hawk White can be used on pipework up to 25mm in diameter without reinforcement fibre. For pipework over 25mm, an approved reinforcing fibre should be used.

Hawk White complies with BS EN 751-2 Class A when used in the appropriate applications and provides a reliable seal for a wide range of plumbing and heating installations. It is supplied as a thick off-white paste in a 400g tin.

Important: Hawk White is intended for non-potable water applications. For drinking water systems, Fernox recommends Water Hawk instead.

The Fernox TF1 Omega Filter 22mm Slip Socket is a high-performance in-line central heating system filter designed to protect domestic heating systems from circulating corrosion debris, sludge, scale and installation contaminants.

Its precision-engineered design combines powerful neodymium magnetic filtration with Fernox Hydronic Particle Separation (HPS) technology to capture both magnetic and non-magnetic contaminants from system water.

The compact design makes the TF1 Omega particularly suitable for installations where space is restricted. It can be installed on horizontal or vertical 22mm pipework, in either flow direction, and can be positioned at up to 45° from vertical where required.

The nickel-plated forged brass construction provides a robust and durable filter body, while the sealed design allows the filter to be cleaned quickly without dismantling the unit.

The TF1 Omega is ideally installed on the return pipe to the boiler and can also provide a convenient dosing point for Fernox Express water treatment products.

The filter is backed by a 25-year warranty from Fernox.

The Fernox TF1 Omega Filter is a high-performance, compact in-line magnetic filter designed to protect domestic central heating systems from circulating corrosion, scale and installation debris.

The TF1 Omega combines powerful magnetic filtration with Hydronic Particle Separation (HPS) technology to capture both magnetic and non-magnetic contaminants from system water. Its compact design makes it particularly suitable for installations where space is restricted.

This 22mm version is supplied with valves, making installation and servicing straightforward. The filter can be fitted to horizontal or vertical pipework, in either flow direction, and can be positioned up to 45° from vertical where access or headroom is limited.

The filter is designed to be installed on the return pipe to the boiler. It can be cleaned in situ without dismantling the unit, helping to make routine maintenance quick and convenient.

Fernox Protector F1 265ml is a high-performance central heating inhibitor designed to provide long-term protection against internal corrosion and limescale formation in domestic heating systems.

Suitable for all types of boilers, radiators and pipework systems, Fernox Protector F1 is compatible with commonly used heating system materials, including aluminium and mixed-metal systems.

One 265ml bottle treats an average domestic heating system of up to 100 litres, 12 radiators or 190m² of underfloor heating. It can also be conveniently dosed through a Fernox TF1 system filter.

For best results, Fernox recommends thoroughly cleaning and flushing untreated or contaminated systems with a suitable Fernox Cleaner before adding Protector F1. Protector levels should also be checked annually as part of routine system maintenance.

The Fernox System Health Check provides a detailed assessment of central heating system water to help identify potential problems with system condition and water treatment.

The service tests all major water parameters to help identify defects within the heating system or existing treatment. It can also be used to verify that recommended cleaning and water treatment procedures have been correctly carried out.

Following testing, customers receive an easy-to-read report containing the results and recommendations for any further action required.

Results are returned within 48 hours, making the System Health Check a useful service for heating engineers who need a clearer picture of system water quality and treatment levels.

Fernox Cleaner F3 265ml is a universal, fast-acting, pH-neutral cleaner designed to remove sludge, limescale and installation debris from central heating systems.

Suitable for both new and existing heating systems, Cleaner F3 helps remove contaminants that can affect heating efficiency and contribute to boiler noise. It can also be used when pre-commissioning new systems to remove flux residues and other installation debris in accordance with BS 7593:2019.

Compatible with all metals and materials commonly used in heating systems, including aluminium, Fernox Cleaner F3 can be used with manual or magnetic flushing methods and with powerflushing equipment where systems are heavily contaminated.

One 265ml bottle treats an average domestic heating system of up to 100 litres, up to 12 radiators or 190m² of underfloor heating. It can also be dosed through a Fernox TF1 filter.

The Fernox TF1 Antifreeze Valve 28mm Compression is designed to protect water-based air source heat pump systems from damage caused by freezing temperatures.

When the temperature of the system fluid falls below approximately 3°C, the valve automatically opens and releases a small amount of system water. This helps prevent ice from forming within the heat pump circuit and protects vulnerable components and pipework from potential frost damage.

The valve is manufactured from durable brass and is designed for outdoor installation in the coldest part of the system. It must be installed horizontally with the outlet facing downwards to allow discharged water to drain freely.

Fernox recommends installing an antifreeze valve on both the flow and return pipes. The valve is supplied individually with installation instructions and is covered by a 5-year warranty.

The Fernox TF1 Omega Installer Pack 22mm With Valves is a complete solution for cleaning, protecting and guarding domestic central heating systems.

The pack combines the Fernox TF1 Omega 22mm Filter with valves, Fernox Cleaner F3 500ml and Fernox Protector F1 500ml, giving installers the key products needed to clean an existing system and provide long-term protection against corrosion and limescale.

The TF1 Omega is a precision-engineered, sealed in-line system filter made from nickel-plated forged brass. It combines a powerful neodymium magnet with Hydronic Particle Separation technology to capture both magnetic and non-magnetic contaminants from central heating system water.

The filter is designed to minimise pressure loss while maintaining high collection efficiency. It can be cleaned without dismantling the filter, with collected debris discharged through the drain valve. Fernox recommends installing it on the return pipe to the boiler.

The pack is backed by a 25-year warranty on the TF1 Omega filter.

The Fernox TF1 Sigma Mini 22mm Slip Socket is a compact, high-performance magnetic system filter designed to protect domestic central heating systems from the damaging effects of circulating corrosion debris.

Its ultra-compact design makes it ideal for installations where space around the boiler is restricted, requiring as little as 105mm clearance. The filter can be installed on horizontal, vertical or 360° pipework and is ideally positioned on the return flow to the boiler.

A powerful neodymium magnet captures sludge and magnetite from the system water, while the engineered internal flow paths maintain high collection efficiency with minimal pressure loss.

The sealed design allows captured debris to be removed quickly and cleanly through the drain point without dismantling the filter. The filter can also be used as a convenient dosing point for Fernox chemical water treatments.

The TF1 Sigma Mini is suitable for water, inhibited glycol solutions and Fernox system additives and is backed by a 10-year warranty.