---
product_id: 48819831
title: "Fernox 56599 F1 500 ml Central Heating Protector"
brand: "fernox"
price: "¥8853"
currency: JPY
in_stock: true
reviews_count: 8
category: "Fernox"
url: https://www.desertcart.jp/products/48819831-fernox-56599-f1-500-ml-central-heating-protector
store_origin: JP
region: Japan
---

# Prevents radiator cold spots Compatible with all metals Corrosion & scale protection Fernox 56599 F1 500 ml Central Heating Protector

**Brand:** fernox
**Price:** ¥8853
**Availability:** ✅ In Stock

## Summary

> 🔥 Keep your heating flawless & efficient — because your home deserves the best! 🏡

## Quick Answers

- **What is this?** Fernox 56599 F1 500 ml Central Heating Protector by fernox
- **How much does it cost?** ¥8853 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/48819831-fernox-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

- • **Boost Efficiency & Save:** Use with F3 Cleaner to unlock up to 15% gas savings on your heating bills.
- • **Long-Term Peace of Mind:** Trusted by professionals to maintain system cleanliness and extend boiler lifespan.
- • **Ultimate System Defense:** Protects ferrous, copper & aluminum metals from corrosion and limescale buildup.
- • **Easy Maintenance Upgrade:** Simple 500ml dose every few years keeps your heating system running flawlessly.
- • **Silent Radiators, Smooth Pumps:** Stops frequent venting and prevents sticking pumps for whisper-quiet operation.

## Overview

Fernox 56599 F1 Central Heating Protector is a 500ml liquid formula designed to prevent corrosion and limescale in domestic heating systems. Compatible with all metals commonly used in boilers, radiators, and pipework, it enhances system efficiency, reduces maintenance needs, and can deliver up to 15% gas savings when paired with Fernox F3 Cleaner. Ideal for long-term protection and smooth, silent radiator performance.

## 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 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 5,857 in DIY & Tools ( See Top 100 in DIY & Tools ) 45 in Central Heating System Accessories 104 in Pumps & Plumbing Equipment |
| Customer Reviews | 4.7 4.7 out of 5 stars (2,117) |
| Date First Available | 8 Oct. 2011 |
| Included Components | 1 x Fernox 56599 F1 500 ml Protector |
| Item Package Quantity | 1 |
| Item Weight | 499 g |
| Item model number | 56599 |
| Manufacturer | Fernox |
| Material | Liquid |
| Number of Pieces | 1 |
| Part Number | 56599 |
| Power Source | AC |
| Product Dimensions | 18.49 x 8.99 x 5.51 cm; 498.95 g |
| Size | 500 ml (Pack of 1) |
| Special Features | Removes limescale |
| Style | Orignal Packaging |
| Usage | Indoor use only |
| Volume | 500 Millilitres |

## 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

![Fernox 56599 F1 500 ml Central Heating Protector - Image 1](https://m.media-amazon.com/images/I/71vgSqRV2bL.jpg)
![Fernox 56599 F1 500 ml Central Heating Protector - Image 2](https://m.media-amazon.com/images/I/61HGl4Zz15L.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

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐ Sealed pressurised system
*by M***N on 28 June 2025*

I’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

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-15*