---
product_id: 202294475
title: "CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating"
brand: "coswarm"
price: "A$157"
currency: AUD
in_stock: true
reviews_count: 13
category: "Cos Warm"
url: https://www.desertcart.com.au/products/202294475-cw1-central-heating-system-inhibitor-and-protector-treats-upto-18
store_origin: AU
region: Australia
---

# Non-toxic & biodegradable formula Treats up to 18 radiators Prevents rust, limescale & corrosion CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating

**Brand:** coswarm
**Price:** A$157
**Availability:** ✅ In Stock

## Summary

> 🛠️ Protect your heat, save your wallet, and join the smart home revolution!

## Quick Answers

- **What is this?** CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating by coswarm
- **How much does it cost?** A$157 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/202294475-cw1-central-heating-system-inhibitor-and-protector-treats-upto-18)

## Best For

- coswarm enthusiasts

## Why This Product

- Trusted coswarm brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Eco-Friendly Power:** Non-toxic, biodegradable formula that’s safe for your home and the planet.
- • **Universal Compatibility:** Works seamlessly with all metals and heating systems, including aluminium.
- • **Trusted Safety Certified:** NSF certified for peace of mind and proven quality assurance.
- • **Ultimate Boiler Longevity:** Extend your boiler’s life with advanced corrosion and scale protection.
- • **Super Concentrated Efficiency:** 500ml treats up to 18 radiators—less product, more protection.

## Overview

CosWarm CW1 Central Heating System Inhibitor is a super concentrated, NSF-certified treatment fluid designed to protect boilers, radiators, and underfloor heating from rust, limescale, sludge, and corrosion. Suitable for all heating systems and metals, it treats up to 18 radiators per 500ml bottle with a non-toxic, biodegradable formula that ensures long-lasting, efficient heating performance while being environmentally responsible.

## Description

Shop CosWarm CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating. Free delivery on eligible orders of £20 or more.

Review: Good stuff. - Does the job.
Review: Excellent - Excellent 👍

## Features

- Contains benzisothiazolone. May produce an allergic reaction.
- Safety data sheet available on request.
- EXTEND THE LIFE OF YOUR BOILERS with CosWarm CW1 boiler corrosion inhibitor and rust prevention liquid. This revolutionary formula protects your system from scale formation, corrosion buildup and provides continuous protection. It stops frequent venting of radiators and ensures long-lasting and smooth working of boilers.
- SUITABLE FOR EXISTING & NEW HEATER SYSTEMS: CosWarm CW1 steam boiler inhibitor for central heating can be used for all types of boiler, radiators and pipework systems. Our boiler limescale and rust preventer is compatible with all metals and materials (including aluminium) commonly used in central heating systems.
- NON-TOXIC & BIODEGRADABLE: With CosWarm CW1 central heating inhibitors, power meets green. The biodegradable formula is safe for your boilers as well as the Earth. Our boiler rust and corrosion inhibitor is non-toxic and is safer to use around pipes, people and the environment than other toxic and acidic boiler inhibitors.
- SUPER CONCENTRATED FORMULA: Our highly concentrated radiator inhibitor fluid treats much more and requires no secondary containment for it to work. 500 ml of CosWarm CW1 heating system inhibitor can treat up to 18 single radiators (150-litre system).
- NSF CERTIFIED FOR SAFETY: Millions of customers take it as a mark of quality assurance because every aspect of a product’s development is thoroughly evaluated by one of today’s most respected independent product testing organisations.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B086DV7PD5 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 344,058 in DIY & Tools ( See Top 100 in DIY & Tools ) 3,205 in Central Heating System Accessories |
| Customer Reviews | 4.3 4.3 out of 5 stars (336) |
| Date First Available | 26 Mar. 2020 |
| Item Weight | 500 g |
| Manufacturer | CosWarm |
| Manufacturer reference | CW1-AU |
| Part Number | CW1-AU |
| Product Dimensions | 18.3 x 8.7 x 5.8 cm; 500 g |

## Images

![CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating - Image 1](https://m.media-amazon.com/images/I/414wUWB1DRL.jpg)
![CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating - Image 2](https://m.media-amazon.com/images/I/41E9FLfokWL.jpg)
![CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating - Image 3](https://m.media-amazon.com/images/I/41SRHvzZ8JL.jpg)
![CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating - Image 4](https://m.media-amazon.com/images/I/41XVxUPbZmL.jpg)
![CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating - Image 5](https://m.media-amazon.com/images/I/51Rn3cidi6L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good stuff.
*by A***K on 12 May 2025*

Does the job.

### ⭐⭐⭐⭐⭐ Excellent
*by B***H on 5 December 2024*

Excellent 👍

### ⭐⭐⭐⭐ Easy to use and good value
*by B***K on 5 April 2021*

Product arrived on time and appears better value than many competitors. 500 ml treats up to 18 radiators, most competitors sell 1L bottles that only treat 10. Assuming it does what it says on the bottle, it’s excellent value. Very easy to add to the heating system.

## Frequently Bought Together

- CosWarm CW1 Central Heating Inhibitor & Protector | Treats Up to 18 Radiators | Boiler Water Chemicals | Prevents Rust, Corrosion & Scale in Boilers, Hot Water Systems & Hydronic Heating Systems
- CosWarm CW3 Central Heating System Cleaner | Treats Up To18 Radiators | Boiler, Radiator & Pipe System Cleaning & Descaling Solution | Cleans & Removes Rust, Debris, Scale, Sludge | Underfloor
- CosWarm CW2 Central Heating System Silencer – Boiler & Radiator Noise Reducer Absorber & Dosing Liquid for Closed Loop System, Hydronic System – Reduces Boiler Noise - For 18 Single Radiators

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-27*