--- product_id: 92537112 title: "56599 F1 500 ml Central Heating Protector" brand: "fernox" price: "£49.21" currency: GBP in_stock: true reviews_count: 7 category: "Fernox" url: https://www.desertcart.co.uk/products/92537112-56599-f1-500-ml-central-heating-protector store_origin: GB region: United Kingdom --- # Stops radiator venting Prevents pump seizing Corrosion protection 56599 F1 500 ml Central Heating Protector **Brand:** fernox **Price:** £49.21 **Availability:** ✅ In Stock ## Summary > 🔥 Keep your heating system flawless and your home effortlessly warm! ## Quick Answers - **What is this?** 56599 F1 500 ml Central Heating Protector by fernox - **How much does it cost?** £49.21 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/92537112-56599-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 - • **Pump Savior:** Prevents sticking pumps, extending your system’s lifespan. - • **Radiator Revival:** Eliminates cold spots for consistent, cozy warmth. - • **Energy-Smart Formula:** Use with F3 Cleaner to slash gas bills by up to 15%. - • **Maintenance Made Easy:** Stops frequent venting, saving you time and hassle. - • **Ultimate Corrosion Shield:** Protects all metals in your heating system from rust and decay. ## Overview Fernox 56599 F1 Protector is a 500ml liquid additive designed to safeguard domestic central heating systems from corrosion and limescale buildup. Compatible with all metals and materials in boilers, radiators, and pipework, it enhances system efficiency, prevents pump seizing, and reduces radiator cold spots. When paired with Fernox F3 Cleaner, it can deliver up to 15% gas savings, making it a smart, natural, acid-free solution for long-term heating protection. ## 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 Set Contains: 1 x F1 500ml Protector Review: Good price - From what it says on the bottle seems to be good stuff have it in the boiler for about five years and water is crystal clear, so decide to add some more. Seller shipping was a bit slow but the price makes up for it. I was not in a rush to receive it so five stars from me. Use a cleaner first drain system than ad this one. If you shutting your pump for the summer this will stop pump from seizing. Review: Not for human consumption - Good product. Use it regularly. Can tell difference. ## Features - 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 | #385,673 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #805 in Industrial Lubricants #10,539 in HVAC #22,388 in Pumps & Plumbing Equipment | | Brand | Fernox | | Brand Name | Fernox | | Contains Liquid Contents? | Yes | | Customer Reviews | 4.6 out of 5 stars 28 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 Milliliters | | Item Weight | 1.1 Pounds | | Manufacturer | Fernox | | Material Feature | Natural | | Material Features | Natural | | Material Type Free | Acid Free | | Model Number | 56599 | | Number of Items | 1 | | Part Number | 56599 | | Scent | Almond | | Size | 16.91 Fl Oz (Pack of 1) | | Special Features | Removes limescale | | Specific Uses For Product | Indoor use only | | Surface Recommendation | Metal | | Unit Count | 16.907 Fluid Ounces | ## Product Details - **Brand:** Fernox - **Item Form:** Liquid - **Material Feature:** Natural - **Scent:** Almond - **Specific Uses For Product:** Indoor use only ## Images ![56599 F1 500 ml Central Heating Protector - Image 1](https://m.media-amazon.com/images/I/71vgSqRV2bL.jpg) ## Questions & Answers **Q: How do i add this f1 to steam boiler? can i add it through an air vent hold on a radiator? thanks** A: My boiler isn’t steam, it’s hot water. But the directions that I was given was to remove/drain all of the current water in the system completely after the boiler has cooled off. Then add the cleaner. Now what I did was to add a shark bite “T”and poured it into the system as I didn’t have another other place to put it in. Then I removed the “T” and replaced it with a coupler. But on a steam system I would think that you could add it to your radiator top vent and put it in then refill the system. After it’s refilled your going to run it if a few days. I’m doing mine a little longer, like 10 days. So during that time the chemical is going to move around and clean the system. Just make sure you turn off the boiler before you start doing any work on it. I hope that this helps **Q: How many gallons will this treat?** A: My bottle says that it will treat up to 34 US gallons. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good price *by A***R on February 2, 2020* From what it says on the bottle seems to be good stuff have it in the boiler for about five years and water is crystal clear, so decide to add some more. Seller shipping was a bit slow but the price makes up for it. I was not in a rush to receive it so five stars from me. Use a cleaner first drain system than ad this one. If you shutting your pump for the summer this will stop pump from seizing. ### ⭐⭐⭐⭐ Not for human consumption *by K***Y on April 8, 2026* Good product. Use it regularly. Can tell difference. ### ⭐⭐⭐⭐⭐ Corrosion protection *by R***N on June 27, 2021* Time will tell if it works. I would have to do a partial drain of boiler water to check for rust cause i have 2 cast iron radiators in my basement, the rest of my rooms have baseboard elements which are copper ## 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? - 🛒 **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.co.uk/products/92537112-56599-f1-500-ml-central-heating-protector](https://www.desertcart.co.uk/products/92537112-56599-f1-500-ml-central-heating-protector) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-26*