--- product_id: 50498337 title: "Fernox 56599 500ml F1 Protector" brand: "fernox" price: "$68.20" currency: USD in_stock: true reviews_count: 8 category: "Fernox" url: https://www.desertcart.us/products/50498337-fernox-56599-500ml-f1-protector store_origin: US region: United States of America --- # Up to 15% gas savings Eco-friendly & non-toxic Corrosion & limescale protection Fernox 56599 500ml F1 Protector **Brand:** fernox **Price:** $68.20 **Availability:** ✅ In Stock ## Summary > 🛠️ Protect your heat, save your wallet, and join the smart home revolution! ## Quick Answers - **What is this?** Fernox 56599 500ml F1 Protector by fernox - **How much does it cost?** $68.20 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/50498337-fernox-56599-500ml-f1-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 - • **Eco-Conscious Heating:** Certified by the Carbon Trust, this non-toxic formula supports a greener home without compromising performance. - • **Ultimate System Defense:** Protects all metals in your central heating system from corrosion and limescale buildup for long-term reliability. - • **Silent & Smooth Operation:** Prevents boiler noise, sticking pumps, and cold spots—enjoy a quieter, more consistent heat. - • **Maximize Efficiency, Minimize Bills:** Achieve up to 15% gas savings when paired with Cleaner F3—cut costs without sacrificing comfort. - • **Easy Maintenance, Year-Round Protection:** Treats up to 100L or 10 radiators with simple annual checks using Fernox’s test kit—stay ahead of costly repairs. ## Overview Fernox 56599 500ml F1 Protector is a premium liquid additive designed to safeguard mixed metal central heating systems from corrosion and limescale. Compatible with all common metals and materials, it enhances system efficiency—especially when used with Cleaner F3—delivering up to 15% gas savings. Certified eco-friendly and non-toxic, it reduces maintenance costs, prevents boiler noise, and ensures consistent heating performance for up to 100L or 10 radiators. ## Description Product Description Fernox protector F1 liquid protects against corrosion and scale in mixed metal central heating systems. When used in conjunction with Cleaner F3 gas savings of up to 15 percent can be achieved every time you heat your room. Carbon Footprint certified by the Carbon Trust. Stops frequent venting of radiators. Prevents sticking pumps and boiler noise. Reduces maintenance costs and saves on fuel bills. Prevents cold spots in radiators. Non toxic, environmentally friendly. Volume: 500ml.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 Protector F1 is compatible with all metals and materials commonly used in central heating systems. For continued protection we recommend Protector F1 levels are checked regularly (annually). The concentration of the product can be easily measured on site using a Fernox Protector Test Kit. Box Contains 1 x Protector F1 Liquid bottle 500ml Review: great product, saved me calling a plumber - I was experiencing some problems with my heating system and the boiler kept cutting out, a friend suggested that I may have a blockage in the pipe especially since one of the radiators produced black water when I released some water from it, so I purchased some Fernox F3 cleaner and ran that through the system for a few days and then once fully flushed out I refilled using this F1 protector, and so far the boiler was worked perfectly and think its even making less noise than it did before. If this continues to be a success I plan to clean and protect on an annual basis to ensure the heating system is it good condition. There are other brands on the market but I chose Fernox as an internet search showed it had a good reputation and so far I have not been disappointed and so I will continue to use Fernox. Using this product and a weekend of my time has saved me a big plumbers expense. Review: Watch out for spillages as when working in a small space you might spill! - Make sure when purchasing this is right for your heating system ask for advice first! ## Features - Contains benzisothiazolone. May produce an allergic reaction. - Protects against corrosion and limescale in central heating systems - When used in conjunction with Cleaner F3 gas savings of up to 15% can be achieved - Reduces maintenance costs and saves on fuel bills - Treats 100L system or up to 10 single radiators - Compatible with all metals and materials commonly used in central heating systems ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00BL8CVZM | | Batteries Required? | No | | Batteries included? | No | | Best Sellers Rank | 190,172 in Garden ( See Top 100 in Garden ) 257 in Patio Heaters | | Customer Reviews | 4.7 4.7 out of 5 stars (89) | | Date First Available | 21 Feb. 2013 | | Item Package Quantity | 1 | | Item Weight | 658 g | | Item model number | 56599 | | Manufacturer | Fernox | | Package Dimensions | 20.8 x 9.8 x 6.8 cm; 658 g | | Part Number | 56599 | | Power Source | Gas Powered | ## Images ![Fernox 56599 500ml F1 Protector - Image 1](https://m.media-amazon.com/images/I/81aL6yd2EBL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ great product, saved me calling a plumber *by S***A on 21 September 2016* I was experiencing some problems with my heating system and the boiler kept cutting out, a friend suggested that I may have a blockage in the pipe especially since one of the radiators produced black water when I released some water from it, so I purchased some Fernox F3 cleaner and ran that through the system for a few days and then once fully flushed out I refilled using this F1 protector, and so far the boiler was worked perfectly and think its even making less noise than it did before. If this continues to be a success I plan to clean and protect on an annual basis to ensure the heating system is it good condition. There are other brands on the market but I chose Fernox as an internet search showed it had a good reputation and so far I have not been disappointed and so I will continue to use Fernox. Using this product and a weekend of my time has saved me a big plumbers expense. ### ⭐⭐⭐⭐⭐ Watch out for spillages as when working in a small space you might spill! *by D***R on 18 March 2026* Make sure when purchasing this is right for your heating system ask for advice first! ### ⭐⭐⭐⭐⭐ A Reliable Corrosion Inhibitor for Central Heating Systems *by A***1 on 16 December 2025* We have used this Fernox F1 protector fluid in our central heating system for many years and find it excellent as a corrosion/rust preventative. ## Frequently Bought Together - Fernox 56599 500ml F1 Protector - Fernox 56600 500ml F3 Cleaner - Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/50498337-fernox-56599-500ml-f1-protector](https://www.desertcart.us/products/50498337-fernox-56599-500ml-f1-protector) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-05*