---
product_id: 76121036
title: "Fernox 61033 5L Alphi-11 Anti-Freeze Protector"
brand: "fernox"
price: "€ 293.82"
currency: EUR
in_stock: false
reviews_count: 4
url: https://www.desertcart.sk/products/76121036-fernox-61033-5l-alphi-11-anti-freeze-protector
store_origin: SK
region: Slovakia
---

# Compatible with all heating system metals Protects down to -22°C Combined antifreeze & corrosion inhibitor Fernox 61033 5L Alphi-11 Anti-Freeze Protector

**Brand:** fernox
**Price:** € 293.82
**Availability:** ❌ Out of Stock

## Summary

> 🧊 Stay chill, stay protected — antifreeze that’s as smart as you are.

## Quick Answers

- **What is this?** Fernox 61033 5L Alphi-11 Anti-Freeze Protector by fernox
- **How much does it cost?** € 293.82 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/76121036-fernox-61033-5l-alphi-11-anti-freeze-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-Smart Formula:** Non-toxic and environmentally friendly, because sustainability matters.
- • **Efficiency Booster:** Prevents limescale and corrosion to extend system life and maintain peak performance.
- • **Dual-Action Defense:** Combines antifreeze and corrosion inhibitor for all-around system protection.
- • **Freeze-Proof Confidence:** Keeps your heating system safe from freezing down to -22°C, no winter worries.
- • **Universal Compatibility:** Works seamlessly with all metals and materials in modern heating systems.

## Overview

Fernox 61033 Alphi-11 is a 5L combined antifreeze and corrosion inhibitor designed to protect domestic heating and chilled water systems. It safeguards all common metals against corrosion and limescale, ensuring system efficiency and longevity while operating effectively in temperatures from -11°C to -22°C. Non-toxic and environmentally friendly, it’s the trusted choice for professional-grade heating system protection.

## Description

Product Description Fernox antifreeze protector Alphi 11 protects against corrosion and limescale. Combined antifreeze and protector. Protects heating and chilled water. Maintains efficiency so extending system life. Compatible with all metals and materials commonly used in heating systems. Non-toxic, environmentally friendly. Volume: 5 litres.Fernox Protector Alphi-11 is a combined antifreeze and inhibitor, which 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. Fernox Protector Alphi-11 is compatible with all metals and materials commonly used in central heating systems. For continued protection we recommend Protector 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 Antifreeze Protector Alphi-11 bottle

Review: on time - antifreeze in classic car
Review: Fernox has a good name - Great value best on the market

## Features

- Contains benzisothiazolone. May produce an allergic reaction.
- Combined antifreeze and inhibitor
- Protects against corrosion and limescale
- Protects heating and chilled water systems
- Will protect from -11C to -22C
- Compatible with all metals and materials commonly used in heating systems

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BL8CR6A |
| Batteries Required? | No |
| Batteries included? | No |
| Customer Reviews | 4.7 4.7 out of 5 stars (9) |
| Date First Available | 24 Mar. 2014 |
| Item Package Quantity | 1 |
| Item Weight | 5.42 kg |
| Item model number | 61033 |
| Manufacturer | Fernox |
| Number of Pieces | 1 |
| Package Dimensions | 29.8 x 19.8 x 14.6 cm; 5.42 kg |
| Part Number | 61033 |

## Images

![Fernox 61033 5L Alphi-11 Anti-Freeze Protector - Image 1](https://m.media-amazon.com/images/I/41He0UWxcCL.jpg)
![Fernox 61033 5L Alphi-11 Anti-Freeze Protector - Image 2](https://m.media-amazon.com/images/I/81pqiVyi3VL.jpg)

## Questions & Answers

**Q: Can you please confirm what temperature it protects from as not sure it is wrong in the description "Will protect from -11C to -22C" should not be -1?**
A: I don't think it matters whether its -1 or -11 as it protects down to -22 anyway! It is designed to stop your system freezing up especially if you are away from home and don't leave the boiler on.

**Q: is this concertrated or do i have to dilute it**
A: Its concentrated and can be poured straight into the system via a radiator or the top of the boiler having let out an equivalent amount of water from the system first. You should know roughly how much water is in the system so that you can get the percentage concentration correct as per the instructions.

**Q: I have 8 large radiaters and 4 small radiaters. How much doeses or quantity should I use to fill the systelm after cleaned? Thanks**
A: This is antifreeze protection used in caravans, lodges and other badly insulted accommodation. It would not normal be used in a house.
Since you have not given the volume of the system small house 1 big house 2, 5 litre containers. This is a rule of thumb for actual dose phone Fernox help line.

**Q: What colour is the anti-freeze? i have alime green in my caravan and not sure if this is the same product**
A: Hi This is a clear liquid I have just used this my self at work.

## Customer Reviews

### ⭐⭐⭐⭐⭐ on time
*by K***N on 13 October 2022*

antifreeze in classic car

### ⭐⭐⭐⭐⭐ Fernox has a good name
*by M***N on 18 July 2021*

Great value best on the market

### ⭐⭐⭐⭐⭐ Good quality
*by A***R on 29 July 2021*

Very good

## Frequently Bought Together

- Fernox 61033 5L Alphi-11 Anti-Freeze Protector
- Fernox 56599 F1 500 ml Central Heating Protector
- Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100

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**Shop now:** [https://www.desertcart.sk/products/76121036-fernox-61033-5l-alphi-11-anti-freeze-protector](https://www.desertcart.sk/products/76121036-fernox-61033-5l-alphi-11-anti-freeze-protector)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-02-02*