Fernox F3 Super concentrate Central Heating Cleaner 290ml

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Fernox F3 Super concentrate Central Heating Cleaner 290ml

SKU: 4523

Estimated Delivery:

5 to 8 Working Days ✝FREE
Orders placed before 1pm are processed the same day, delivery times are between 8am & 6pm Monday to Friday, all deliveries require a signature, for delivery instructions please use the notes section during checkout.
Please see below for Items you will also require for this product.

Availability: In stock

Regular Price: £39.95

£36.94 (inc VAT)

✝ Subject to stock availability. UK Mainland only. Delivery fees and times to Northern Ireland, Scottish Highlands & Isles, Isle of Man, Isle of Wight, Isles of Scilly, and the Channel Isles may vary. Deliveries are made during working days only.

Product Description


Fernox Superconcentrate Central Heating Cleaner

Product Features

  • Neutral universal cleanser for pre-commissioning new systems in accordance with BS7593:1992
  • Removes sludge and scale and restores heating efficiency of existing systems
  • Removes flux residues and other debris
  • Compatible with all metals and materials commonly used in heating systems
  • Easy-to-use system can be left running normally during cleansing
  • Easily and quickly added via one of the radiators
  • Universal applicator included
  • Patented application
  • Ideal for pressurised systems and combination boilers
  • Neutral, non-hazardous formula (COSHH rated zero)


Product Uses

Fernox Superconcentrate Central Heating Cleaner F3 is a quick and effective neutral cleanser for central heating systems. It has been designed for pre-commission cleaning new installations in accordance with BS7593:1992, removing flux residues and other installation debris, thereby helping extend the life of a system.  It is also designed to remove all debris, sludge and scale from existing systems of all ages. In this way it will restore heating efficiency and eliminate or reduce boiler noise.

If the system is heavily scaled the use of Fernox Superconcentrate System Cleaner is recommended. Cleaner F3 is a neutral, non-hazardous product that is well inhibited and compatible with all metals and materials commonly used in heating systems. For continued long term protection the system should be thoroughly cleansed and flushed in accordance with BS7593:1992 and Benchmark using Fernox Cleaner F3, before treating with Fernox Protector. We recommend Protector levels are checked regularly (annually).

Physical Properties

  • Colour: Amber
  • Form: Viscous liquid
  • Odour: Faint
  • pH: 7
  • SG: 1.235 g/cm3 (20°C/68oF)

Application and Dosage

A standard mastic gun is used to dose Fernox Superconcentrate Cleaner F3 directly into a radiator air-vent using the special adapter supplied with the product. The entire process can be completed in less than five minutes!

One 290 ml cartridge of Cleaner F3 is usually sufficient to clean an average sized system (up to ten radiators) and is added via one of the radiators. Additional/repeat applications of Cleaner F3 may be necessary, for large systems or if systems are heavily sludged.

First drain and refill the entire system with plain water.  For optimum results the entire system, including drop feed radiators where fitted, should be completely drainable.  Preferably full bore gate valves with hose connectors should be provided temporarily for this purpose. Motorised and thermostatically controlled valves must be set so that no part of the system is closed off during cleansing or rinsing. Discharges must be made to the foul drain and not the surface water drain.

Add Fernox Superconcentrate Cleaner F3 via the radiator air-vent. When pre-commission cleansing new systems Fernox Cleaner F3 should be circulated for a minimum of 1 hour at normal operating temperature. For cleansing existing systems, sludge and debris should be dispersed also within 1 hour at normal operating temperatures. However, to remove hardened iron oxides and limescale, the cleaning time can be extended to up to 1 week under the normal heating cycle. If, a radiator still has a cold spot after 1 hour, increase the flow through the radiator by closing the valves on the other radiators. An additional or repeat dose of Cleaner F3 may be necessary in some cases.

Drain and flush the system thoroughly to remove the cleaning chemical and debris. At least three complete changes of water are likely to be required. This is a crucial part of the cleaning process and must be carried out correctly. Use a rinse test meter such as the Fernox TDS meter to ensure that the Total Dissolved Solids have been satisfactorily removed. The system can be regarded as being thoroughly flushed when the system water value is within 10% of the mains water value. Differences over 10% mean that significant cleanser residues have been left in the system and further flushing is required. If not removed cleanser residues will promote corrosion and negate the cleaning process.

Refill the system adding a suitable Fernox Protector for long term protection against corrosion and limescale.

In single feed indirect cylinders, e.g. "Primatic" or similar, potable water chemicals must be used.

Packaging, Handling and Storage

Fernox Superconcentrate Central Heating Cleaner F3 is supplied in 290 ml cartridges with a universal applicator set. They are available as blister packs with Euro-hook or in boxes. Fernox Superconcentrate Central Heating Cleaner F3 is classified as non-hazardous, but as with all chemicals: Keep out of reach of children. In case of contact with eyes or skin, rinse immediately with plenty of water.

Technical Information

Additional Information

SKU 4523
Manufacturer ID TPARB1409


Here at TradePlumbing.co.uk we have voluntarily extended our returns period to 90 days, as we understand that sometimes there may be the odd item left over from a project or you may have an unexpected delay to a project meaning that you need the added peace of mind when ordering products in case a return is necessary.

We truly believe in being able to offer customers a flexible service and this extended period allows us to go that little extra to help you when in need, as long as goods are returned in the same condition as received we are happy to help.

To return any time initially please email your request to our Customer Support team at customerservice@tradeplumbing.co.uk along with your TP - Order Reference, please allow at least 1 working day for response and we will take it from there.

To View our complete Return Policy Click on Return and Refunds