---
product_id: 49903128
title: "Everbuild P11 Central Heating System Cleanser, 1 Litre"
brand: "everbuild"
price: "€ 43.12"
currency: EUR
in_stock: true
reviews_count: 13
category: "Everbuild"
url: https://www.desertcart.at/products/49903128-everbuild-p11-central-heating-system-cleanser-1-litre
store_origin: AT
region: Austria
---

# Boosts heating efficiency Treats up to 100L system Compatible with all metals & plastics Everbuild P11 Central Heating System Cleanser, 1 Litre

**Brand:** everbuild
**Price:** € 43.12
**Availability:** ✅ In Stock

## Summary

> 🔥 Clean smarter, heat better — never settle for lukewarm!

## Quick Answers

- **What is this?** Everbuild P11 Central Heating System Cleanser, 1 Litre by everbuild
- **How much does it cost?** € 43.12 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/49903128-everbuild-p11-central-heating-system-cleanser-1-litre)

## Best For

- everbuild enthusiasts

## Why This Product

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

## Key Features

- • **DIY-Ready Formula:** Easy to use—just add, wait, flush, and enjoy a revitalized heating system
- • **Powerful System Detox:** Eradicates sludge, scale & corrosive black oxide for peak performance
- • **Silent & Warm Comfort:** Eliminates noisy circulation issues for quieter, warmer radiators
- • **Economical & Efficient:** 1 litre treats up to 100 litres of system capacity—max value, minimal effort
- • **Universal Compatibility:** Safe for plastic tanks, micro bore pipes & all metals including aluminium

## Overview

Everbuild P11 Central Heating System Cleanser is a concentrated liquid solution designed to remove sludge, scale, corrosion, and flux residues from central heating systems. Compatible with plastic tanks, micro bore pipes, and all metals including aluminium, it treats up to 100 litres of system capacity per litre. This cleanser enhances heating efficiency, reduces noise, and restores optimal circulation, making it an essential maintenance product for both new and existing heating systems.

## Description

Product Description Everbuild P11 Central Heating System Cleanser will remove commissioning and flux residues from new systems and restore circulation to old systems which suffer from sludge, scale or corrosion as well as eradicating corrosive black oxide and flux residues. Everbuild P11 Central Heating System Cleanser should also be used when components are replaced or existing systems are extended. P11 Central Heating System Cleanser is compatible with plastic tanks, micro bore and all metals used in heating systems, and its use will enhance the heating efficiency of the system. P11 Central Heating System Cleanser is also economical, 1ltr will treat a 100ltr system capacity. Ingredients Ammonia Manufacturer Contact Information Sika Everbuild 41 Knowsthorpe Way, Leeds LS9 0SW

Review: EXCELLENT PRODUCT, WOULD HIGHLY RECOMMEND IF YOUR SYSTEMS NOT PERFORMING RIGHT - WHAT A DIFFERENCE, I used this after changing my Radiator in the Bathroom, and finding the water in the system was like Treacle Coloured, I put this in the Top of the Radiator in the bathroom, with it being the drained down one, and left it in my system for a month under normal working conditions for Start Winter/ (NOVEMBER) Then Start December, I drained the System again (AND OPENED THE BLEEDING TAPS ON ALL THE RADIATORS) SO WATER COULD FLOW) as it recommend, and what A difference, with draining the complete system at the Draining Valve, (NORMALLY LOCATED OUTSIDE OR AT ONE YOUR VALVES ON ONE THE RADIITORS) and you could see all the like wee fine pieces coming out in the water, I then ran the Filling loop tap and left the draining one open for a while top flush the remains away, I then filled the System and again and went and tightened up the Bleeding valves, and then one at time, I went round all the radiators, and with a jug, opened them and let the air out till I got the like Spitting water then tightened that one up and went to the next, What a difference, as all the Radiators now warm up and you can see the difference in the water when you look in the jug you used for bleeding. as its now crystal clear.
Review: Much improved central heating system - I was skeptical but followed the instructions and left the P11 in the system for a month withthe heating coming on daily. Subsequently flushed and refilled using some new P14. Most impressed, convinced the system is quieter now.

## Features

- Compatible with plastic tanks, micro bore and all metals (including aluminium) used in central heating systems.
- Economical – 1ltr will treat a 100ltr system capacity.
- Enhances heating efficiency.
- Removes sludge, scale and corrosion
- Eradicates corrosive black oxide and flux residues.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002HMRWFA |
| Best Sellers Rank | 42,632 in DIY & Tools ( See Top 100 in DIY & Tools ) 490 in Central Heating System Accessories 1,513 in Building Materials |
| Brand | Everbuild |
| Brand Name | Everbuild |
| Contains Liquid Contents? | Yes |
| Customer Reviews | 4.6 out of 5 stars 258 Reviews |
| Global Trade Identification Number | 05010618213100 |
| Item Form | Liquid |
| Item Volume | 1 Litres |
| Item Weight | 1.14 Pounds |
| Item form | Liquid |
| Item volume | 1 Litres |
| Manufacturer | Everbuild |
| Manufacturer Contact Information | Sika Everbuild 41 Knowsthorpe Way, Leeds LS9 0SW |
| Model Number | P11CLEAN1 |
| Number of Items | 1 |
| Part Number | EVBP11CLEAN1 |
| Scent | Unscented |
| Size | 1 l (Pack of 1) |
| Special Features | Concentrated |
| Specific Uses For Product | central heating pipe cleanser |
| Specific uses for product | central heating pipe cleanser |
| Surface Recommendation | Metal, Plastic |
| Unit Count | 1000.0 millilitre |
| Unit count | 1000.0 millilitre |

## Product Details

- **Brand:** Everbuild
- **Contains liquid contents:** Yes
- **Global Trade Identification Number:** 05010618213100
- **Item form:** Liquid
- **Item volume:** 1 Litres
- **Item weight:** 1.14 Pounds
- **Scent:** Unscented
- **Special feature:** Concentrated
- **Surface recommendation:** Metal, Plastic
- **Unit count:** 1000.0 millilitre

## Images

![Everbuild P11 Central Heating System Cleanser, 1 Litre - Image 1](https://m.media-amazon.com/images/I/81Aj6fNPZKL.jpg)

## Questions & Answers

**Q: If I put this in the header tank can it be left in?**
A: You must partially drain down the system to empty the header tank then you pour in the solution.You then refil the system and leave the heting for about a month.You then completely drain down the system.When completely empty you refill the ystem ith fresh water mixed with a corrosion inhibitor.Vent all the radiators and you are protected or bout a year.RegardsDavid w.

**Q: Is this safe to use within a system that has some plastic piping and plastic push fit fittings?**
A: I would think so

**Q: When you drain down after use should you open bleed valves on radiators? I can't see that instruction on bottle. Thanks**
A: You always need to bleed the system with valves open to prevent air. You will then nee to put Inhibitor in to the system.

**Q: Where do I put this? In a radiator bleed valve or In the boiler if so where?**
A: Your system is probably filled from a connection to a tap. To introduce this cleaner you will need to drain (or part drain) the system beforehand to make some space. Then pour in the cleanser via the highest point, perhaps a radiator valve you have unscrewed and removed. you will need a flexible funnel or make up a copper funnel from standard components. Once that is done, repressurise the system by means of the tap. Run the heating for some time before draining down to remove the water and sludge, then flush again and finally repressurise, remembering to add the protective additive beforehand using the same entry point. If you are unsure, it would be worth finding a knowledgeable friend or neighbour to help. If you have an unpressurised system (Small second water tank in loft) then you could just pour the cleanser into that tank after first shutting off its water supply, but get someone to check what you intend to do or you might put the cleanser in the wrong tank = Disaster. Get live advice.

## Customer Reviews

### ⭐⭐⭐⭐⭐ EXCELLENT PRODUCT, WOULD HIGHLY RECOMMEND IF YOUR SYSTEMS NOT PERFORMING RIGHT
*by R***D on 6 December 2014*

WHAT A DIFFERENCE, I used this after changing my Radiator in the Bathroom, and finding the water in the system was like Treacle Coloured, I put this in the Top of the Radiator in the bathroom, with it being the drained down one, and left it in my system for a month under normal working conditions for Start Winter/ (NOVEMBER) Then Start December, I drained the System again (AND OPENED THE BLEEDING TAPS ON ALL THE RADIATORS) SO WATER COULD FLOW) as it recommend, and what A difference, with draining the complete system at the Draining Valve, (NORMALLY LOCATED OUTSIDE OR AT ONE YOUR VALVES ON ONE THE RADIITORS) and you could see all the like wee fine pieces coming out in the water, I then ran the Filling loop tap and left the draining one open for a while top flush the remains away, I then filled the System and again and went and tightened up the Bleeding valves, and then one at time, I went round all the radiators, and with a jug, opened them and let the air out till I got the like Spitting water then tightened that one up and went to the next, What a difference, as all the Radiators now warm up and you can see the difference in the water when you look in the jug you used for bleeding. as its now crystal clear.

### ⭐⭐⭐⭐⭐ Much improved central heating system
*by J***W on 17 April 2025*

I was skeptical but followed the instructions and left the P11 in the system for a month withthe heating coming on daily. Subsequently flushed and refilled using some new P14. Most impressed, convinced the system is quieter now.

### ⭐⭐⭐⭐ noise
*by D***R on 27 February 2022*

I bought this because i hIad noises every time I turned on central heating, my daughter was visiting us over xmas and she thought there was hailstones coming down, I said no thats the heating system. So finally got around to purchase this cleaner, up in the loft I go empty dirty water out of small tank about 2 buckets, the water was black with lots of small black bits in it. I tip the liquid into tank and refill. That evening I turn on heating and the noise has completely gone, Fantastic. In about a month when weather gets a bit warmer I shall drain down the system and flush it out, refill and add some inhibitor I Recommend this item. .

## Frequently Bought Together

- Everbuild P11 Central Heating System Cleanser, 1 Litre
- Everbuild P14 Central Heating System Inhibitor, 1 Litre
- 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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*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-11-12*