--- product_id: 48819831 title: "56599 F1 500 ml Central Heating Protector" brand: "fernox" price: "€ 38.65" currency: EUR in_stock: true category: "Fernox" url: https://www.desertcart.pt/products/48819831-56599-f1-500-ml-central-heating-protector store_origin: PT region: Portugal --- # Prevents limescale & corrosion buildup Achieves up to 15% gas savings with F3 Cleaner Protects all metals in heating systems 56599 F1 500 ml Central Heating Protector **Brand:** fernox **Price:** € 38.65 **Availability:** ✅ In Stock ## Summary > 🔥 Keep your heating flawless and your energy bills cooler! ## Quick Answers - **What is this?** 56599 F1 500 ml Central Heating Protector by fernox - **How much does it cost?** € 38.65 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/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 - • **Universal Metal Defense:** Safeguards ferrous, copper & aluminum components seamlessly - • **Eco-Conscious Protection:** Natural, acid-free formula that cares for your system and environment - • **Pump Longevity Guarantee:** Prevents sticking pumps, reducing maintenance downtime - • **Energy Efficiency Booster:** Combine with F3 Cleaner to cut gas bills by 15% - • **Radiator Performance Enhancer:** Stops cold spots and frequent venting for consistent warmth ## Overview Fernox 56599 F1 500 ml Central Heating Protector is a premium liquid additive designed to protect domestic central heating systems from corrosion and limescale. Compatible with all metals and materials in boilers, radiators, and pipework, it enhances system efficiency, prevents cold spots, and extends pump life. When paired with Fernox F3 Cleaner, it can deliver up to 15% gas savings, making it an essential upgrade for energy-conscious homeowners. ## 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 ## 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 | 9,962 in DIY & Tools ( See Top 100 in DIY & Tools ) 53 in Central Heating System Accessories 226 in Pumps & Plumbing Equipment | | Brand Name | Fernox | | Contains Liquid Contents? | Yes | | Customer Reviews | 4.7 4.7 out of 5 stars (2,161) | | 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 | | Manufacturer | Fernox | | Material Features | Natural | | Material Type Free | Acid Free | | Model Number | 56599 | | Number of Items | 1 | | Part Number | 56599 | | Scent | Almond | | Size | 500 ml (Pack of 1) | | Special Features | Removes limescale | | 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. ## 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.pt/products/48819831-56599-f1-500-ml-central-heating-protector](https://www.desertcart.pt/products/48819831-56599-f1-500-ml-central-heating-protector) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-08-24*