--- product_id: 48819831 title: "56599 F1 500 ml Central Heating Protector" brand: "fernox" price: "200 zł" currency: PLN in_stock: true reviews_count: 8 category: "Fernox" url: https://www.desertcart.pl/products/48819831-56599-f1-500-ml-central-heating-protector store_origin: PL region: Poland --- # Prevents radiator cold spots Compatible with all metals Corrosion & scale protection 56599 F1 500 ml Central Heating Protector **Brand:** fernox **Price:** 200 zł **Availability:** āœ… In Stock ## Summary > šŸ”„ Keep your heating flawless & efficient ā€” because your home deserves the best! šŸ” ## Quick Answers - **What is this?** 56599 F1 500 ml Central Heating Protector by fernox - **How much does it cost?** 200 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/48819831-56599-f1-500-ml-central-heating-protector) ## Best For - fernox enthusiasts ## Why This Product - Trusted fernox brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - ā€¢ **Boost Efficiency & Save:** Use with F3 Cleaner to unlock up to 15% gas savings on your heating bills. - ā€¢ **Long-Term Peace of Mind:** Trusted by pros for over a decade to maintain clean, sludge-free heating systems. - ā€¢ **Ultimate System Defense:** Protects ferrous, copper & aluminium metals from corrosion and limescale buildup. - ā€¢ **Easy Maintenance Upgrade:** Simple 500ml dose keeps your boiler and radiators running like new. - ā€¢ **Silent Radiators, Smooth Pumps:** Stops frequent venting and prevents sticking pumps for whisper-quiet operation. ## Overview Fernox 56599 F1 500 ml Central Heating Protector is a premium liquid formula designed to safeguard domestic heating systems from corrosion and limescale. Compatible with all common metals and materials, it enhances system longevity, prevents cold spots and pump issues, and can deliver up to 15% gas savings when paired with Fernox F3 Cleaner. Ideal for professional-grade maintenance, it ensures quiet, efficient radiators and a cleaner boiler system. ## Description Product Description Fernox Protector F1 gives long-term protection of domestic central heating systems against internal corrosion and limescale formation. It prevents corrosion of all metals found in these systems, i.e. ferrous metals, copper and copper alloys and aluminium. It is suitable for all types of boiler, radiators and pipe work systems. Fernox F1 Protector is compatible with all metals and materials commonly used in central heating systems. Note: Date mentioned on the item is production date not expiry date Box Contains 1 x F1 500ml Protector Review: Excellent product. - I have been using this product in my central heating system from the new installation which is now 10years ago. I use a full bottle every three years to keep the protection at the highest level for the system, to ensure that all is well within. This has proven to offer excellent protection to the boiler, pipework and radiators. Today I had my heating inspected, boiler serviced and also added an additional radiator to the system by my excellent central heating engineer, who stated that the system and boiler is in exceptional condition for its age and very clean within internally, with no water discolouration or sludge present. Before re-pressurising the system he added a bottle of this via the new radiator to top up the protection of the system. Review: recommended by plumber - Great product for keeping the heating system in good condition. Easy to use and gives peace of mind that everything is protected. I noticed the radiators run smoothly, with no strange noises or issues. A reliable solution that does exactly what it should. Good value for money and worth adding during maintenance. Would recommend for anyone wanting to look after their central heating. ## Features - Contains benzisothiazolone. May produce an allergic reaction. - Harmful to aquatic life with long lasting effects. - Protects Against Corrosion & Scale - When Used with F3 Cleaner Can Achieve 15% Gas Savings - Stops Frequent Venting of Radiators - Prevents Sticking Pumps - Prevents Radiator Cold Spots ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003HQ97E4 | | Best Sellers Rank | 4,787 in DIY & Tools ( See Top 100 in DIY & Tools ) 28 in Central Heating System Accessories 98 in Pumps & Plumbing Equipment | | Brand | Fernox | | Brand Name | Fernox | | Contains Liquid Contents? | Yes | | Customer Reviews | 4.7 out of 5 stars 2,128 Reviews | | Global Trade Identification Number | 05014551565999, 05698292057540 | | Included Components | 1 x Fernox 56599 F1 500 ml Protector | | Item Form | Liquid | | Item Type Name | F1 500ml Protector | | Item Volume | 500 Millilitres | | Item Weight | 1.1 Pounds | | Item form | Liquid | | Item volume | 500 Millilitres | | Manufacturer | Fernox | | Material Features | Natural | | Material Type Free | Acid Free | | Material feature | Natural | | Number of Items | 1 | | Scent | Almond | | Special Features | Removes limescale | | Specific Uses For Product | Indoor use only | | Specific uses for product | Indoor use only | | Surface Recommendation | Metal | | Unit Count | 500.0 millilitre | ## Product Details - **Brand:** Fernox - **Item form:** Liquid - **Item volume:** 500 Millilitres - **Material Type Free:** Acid Free - **Material feature:** Natural - **Scent:** Almond - **Special feature:** Removes limescale - **Specific uses for product:** Indoor use only - **Surface recommendation:** Metal - **Unit count:** 500.0 millilitre ## Images ![56599 F1 500 ml Central Heating Protector - Image 1](https://m.media-amazon.com/images/I/71vgSqRV2bL.jpg) ## Questions & Answers **Q: Hi, Is this Fernox F1 a 500ml bottle that is concentrated to cover a full central heating system typically with 12 radiators?** A: No. Fernox F1 comes as either a 290 ml bottle of Superconcentrate that you can add via a filling point at a radiator (e.g. the bleed valve) OR in a 500 ml bottle that you can either pour into a radiator (if you have a sealed system) - or via the header tank - as you refill your system. The 500 ml bottle dilutes to serve a 3 - 4 bedroom house and a capacity of 100 litres. Fernox's site doesn`t mention the number of radiators but I believe my last bottle said 8 - 10 radiators ??? I also understand that a Double panel radiator counts as TWO radiators.... so buying two bottles would be best, a worthy product. Try the few nails in jam jar of tap water and few nails in jar of system's diluted mixture (catch some as you bleed your rads) and note the results after a few days, the Fernox ones will be shiny still, the others' rusted. This will also re-assure you that you have a strong enough mix for your sized system...... . Repeat test annually and just top up with new once mix starts to shows discoloured nails. Simple, easy, re-assuring and cheap. Bottom line, Fernox F! is a GREAT product and one that I credit with keeping my previous boiler running for some 30 years with the ONLY repair being a replacement pump. Hope this helps. **Q: how to add it to the heating** A: Check out the U Tube videos on how to add Fernox F1. Very easy via a heated towel rail. **Q: Is this the new or the old formula, how many litres will it treat 100ltrs or 130ltrs ?** A: This is the new formula & will cover a system up to 100L typically a 3-4 bedroom house **Q: Label say expiry date ? Or manufacture date ?** A: The label displays the manufacture date. The shelf life is 5 years. ## Customer Reviews ### ā­ā­ā­ā­ā­ Excellent product. *by J***N on 17 December 2025* I have been using this product in my central heating system from the new installation which is now 10years ago. I use a full bottle every three years to keep the protection at the highest level for the system, to ensure that all is well within. This has proven to offer excellent protection to the boiler, pipework and radiators. Today I had my heating inspected, boiler serviced and also added an additional radiator to the system by my excellent central heating engineer, who stated that the system and boiler is in exceptional condition for its age and very clean within internally, with no water discolouration or sludge present. Before re-pressurising the system he added a bottle of this via the new radiator to top up the protection of the system. ### ā­ā­ā­ā­ā­ recommended by plumber *by W***N on 20 September 2025* Great product for keeping the heating system in good condition. Easy to use and gives peace of mind that everything is protected. I noticed the radiators run smoothly, with no strange noises or issues. A reliable solution that does exactly what it should. Good value for money and worth adding during maintenance. Would recommend for anyone wanting to look after their central heating. ### ā­ā­ā­ā­ Sealed pressurised system *by M***N on 28 June 2025* Iā€™m sure that the inhibitor does its job in the system, however, it would have been useful if it came with an adapter for filling through a radiator of a sealed pressurised system, which is more common these days. ## Frequently Bought Together - Fernox 56599 F1 500 ml Central Heating Protector - Fernox 57882 F3 System Cleaner 1 Pint - Fernox 62436 Central Heating Protector F1 Express - 400ML --- ## Why Shop on Desertcart? - šŸ›’ **Trusted by 1.3+ Million Shoppers** ā€” Serving international shoppers since 2016 - šŸŒ **Shop Globally** ā€” Access 737+ million products across 21 categories - šŸ’° **No Hidden Fees** ā€” All customs, duties, and taxes included in the price - šŸ”„ **15-Day Free Returns** ā€” Hassle-free returns (30 days for PRO members) - šŸ”’ **Secure Payments** ā€” Trusted payment options with buyer protection - ā­ **TrustPilot Rated 4.5/5** ā€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pl/products/48819831-56599-f1-500-ml-central-heating-protector](https://www.desertcart.pl/products/48819831-56599-f1-500-ml-central-heating-protector) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-01*