Fernox F3 Central Heating Cleaner 500ml

By Fernox Product code: 80785 Pack size: Each

£15.74 was £19.68 Exc. VAT £13.12

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Product Details

Removes sludge, scale and debris from new and existing central heating systems to improve boiler efficiency. Suitable for use with powerflushing machines.

An effective, universal pH neutral, non-foaming liquid cleaner, which removes sludge, scale and debris from existing central heating systems to restore heating efficiency and eliminate boiler noise. When commissioning new systems in accordance with BS 7593:2019 regulations and best practice, Cleaner F3 is ideal to remove flux residues and other installation debris to help extend the life of the boiler and the efficiency of the system. It is suitable for use when powerflushing to accelerate the cleaning process in existing and contaminated systems. A non-hazardous product which is compatible with all metals commonly used in heating systems, including aluminium.

• Neutral universal cleaner for pre-commissioning new systems in accordance with BS7593:2006
• Removes sludge, limescale and other debris to restore heating efficiency of existing systems
• Compatible with all metals and materials commonly used in heating systems
• pH Neutral, non-hazardous, non-foaming formula, which is fast and easy to remove from the system
• One 500ml recyclable bottle treats up to 130 litres of system water (16 radiators) and the equivalent of 250m2 of underfloor systems.

Technical Specification
Brand Fernox
Manufacturer ID 56600
Safety Data Sheet click here
Type Cleaner
Volume (L) 0.5
Volume (ml) 500
Container Type Liquid
Range Name F3
Delivery details

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery – £5.00 or FREE for orders over £25

  • Order before 9pm Monday to Thursday for next business day delivery
  • Order Friday to Sunday before 5pm for Monday delivery
  • Orders placed after Sunday at 5pm will be delivered the following Tuesday
Pre-12pm Delivery – £10.00 to arrive before 12pm on the scheduled days above
Saturday Delivery – £10.00 or £5.00 for orders over £25 & FREE for orders over £75 (order by 6pm Friday)
Sunday delivery – £10.00 or £5.00 for orders over £25 & FREE for orders over £75 (order by 4pm Saturday)
Times may vary for items being delivered directly from the supplier. For more information, please visit our delivery information page below.
Items over 30kg can only be delivered from Monday to Friday. If ordered before 6pm, please allow up to two business days for delivery. Orders placed after 6pm Thursday will be delivered after the weekend.
More about Delivery
Click & Collect details

Collection Details

Our opening times are 7am-8pm Monday-Friday, 7am-6pm Saturday and 9-4pm Sunday. Please check your local store is open on the store locator page, before you visit.

Once you have placed your order online, we’ll have it ready for you at the store you have selected in as little as 5 minutes. We will hold your order for 14 days, after which we will automatically generate a refund to the payment type you used to place the order.

Don’t forget your mobile number – Make sure your mobile number is added so that we can text you when your order is ready to collect. Please wait for your text or email before coming to collect your items.

If an item is eligible for Next Business Day Collection in store, the order must be placed by 9pm Monday to Thursday for collection the next day. Orders placed after 9pm on Thursday, and up to 5pm on Sunday, will be available for collection on Monday. For larger items over 30kg, please allow two business days.

Fernox F3 Central Heating Cleaner 500ml is rated 4.4 out of 5 by 30.
Rated 5 out of 5 by from Best Boiler cleaner - Fernox F3 Excellent cleaner. All sound from my 22 year old boiler gone.
Date published: 2023-03-01
Rated 5 out of 5 by from World well Used it to nurse system over winter before refit. Within an hour the radiators were untouchable (allowing me to lower they circulating temperature) and water a few days it was noticeable that I could hear the water rushing through the radiators. Will use again
Date published: 2023-01-19
Rated 5 out of 5 by from central heating cleaner clear instructions - cheap
Date published: 2022-03-06
Rated 3 out of 5 by from Coke Cola water The colour of Fernox F3 is a brown rusty colour so even if your system has clean water in it, it will show as coke cola upon draining to show its removed all the filth when it might not have done anything. Fernox F3 should be colourless otherwise how can you tell if its the actual sludge etc it has removed upon draining or the colour of Fernox F3 itself coming out. Having said this and to be fair, it did improved the hot/cold temp fluctuation in our showerbath and i had put 2x 500ml bottles of The F3 in and ran it in the system for 5 days before draining. It took about 2 hours of constant draining with inlets fully open at combi boiler to clear the water of the dye in the Fernox F3. That done, i put 2 x 500ml of Fernox F1 inhibitor and after a few days of running system, i drained a little water from the system to add 1x 500ml Fernox sealer for good measure.
Date published: 2022-03-04
Rated 5 out of 5 by from Fernox system cleaner A good value product. It is a must for any central heating system.
Date published: 2022-02-22
Rated 5 out of 5 by from Great product Great product easy to use
Date published: 2021-12-12
Rated 5 out of 5 by from Fernox Central Heating products Have used Fernox Central Heating products in the past. Always found them to be effective.
Date published: 2021-09-10
Rated 5 out of 5 by from Silent radiators Bought this a couple of years ago to clean out radiators (without power cleaner). Works a treat- they've since been silent and run smoothly. Used F3 again this year as a precaution.
Date published: 2021-05-04
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