--- product_id: 49590152 title: "Sentinel - X800 Fast Acting Cleaner 1L, targeted central heating system cleaning inside an hour, restores system efficiency by targeting corrosion debris, ideal for hot and cold systems" brand: "sentinel" price: "141 zł" currency: PLN in_stock: true reviews_count: 8 category: "Sentinel" url: https://www.desertcart.pl/products/49590152-sentinel-x800-fast-acting-cleaner-1l-targeted-central-heating-system store_origin: PL region: Poland --- # Ideal for hot & cold systems 1-hour rapid action Targets corrosion & scale Sentinel - X800 Fast Acting Cleaner 1L, targeted central heating system cleaning inside an hour, restores system efficiency by targeting corrosion debris, ideal for hot and cold systems **Brand:** sentinel **Price:** 141 zł **Availability:** ✅ In Stock ## Summary > ⚡ Clean fast, heat smart — don’t let corrosion slow you down! ## Quick Answers - **What is this?** Sentinel - X800 Fast Acting Cleaner 1L, targeted central heating system cleaning inside an hour, restores system efficiency by targeting corrosion debris, ideal for hot and cold systems by sentinel - **How much does it cost?** 141 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/49590152-sentinel-x800-fast-acting-cleaner-1l-targeted-central-heating-system) ## Best For - sentinel enthusiasts ## Why This Product - Trusted sentinel brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **User-Approved Reliability:** Trusted by thousands with a 4.5-star rating and glowing real-world results. - • **Precision Corrosion Combat:** Specialized formula dissolves stubborn corrosion debris for a cleaner, quieter system. - • **Versatile Powerflush Partner:** Perfectly compatible with powerflushing and effective even in cold systems. - • **Lightning-Fast System Revival:** Restores heating efficiency in just 60 minutes—no downtime, no hassle. - • **Refreshing Lemongrass & Aloe Scent:** Clean your system without the chemical sting—enjoy a subtle, fresh aroma. ## Overview Sentinel X800 Fast Acting Cleaner is a cutting-edge liquid solution designed to rapidly remove corrosion deposits and scale from central heating systems within one hour. Suitable for both hot and cold systems, it restores system efficiency, reduces noise, and extends boiler life. Trusted by professionals and DIY enthusiasts alike, this 1L cleaner combines unrivalled chemical technology with a refreshing lemongrass and aloe scent for a fast, effective, and pleasant cleaning experience. ## Description To quickly remove corrosion deposits and scale in 1 hour, older systems should be cleaned with Sentinel X800 Fast Acting Cleaner to fully restore system efficiency. Review: Combi Clean much needed - My Combi Boiler was Kettleing/Knocking when showering or filling the kitchen sink, I mentioned it when the boiler was serviced and plumber said the plate heat exchanger to heat the water was blocked with limescale and needed replacing, obviously you don't buy a new kettle when it gets bit of limescale on the element! So I opted for this treatment. Best way I could think to add the liquid was the towel heater as it has a nice big fill plug on the top of it and easy access too. I closed both the inlet valves to the towel rail and drained half of the water using the top plug as an tap to control the flow. Once 2 litres out I poured in the treatment refitted the plug and opened the valves, switched on the boiler to circulate the treatment, turned on the hot water tap on to make sure it would clean the plate heat exchanger, 24 hours on there is no knocking or ketteiling, lovely perfect shower at the perfect temperature. Now working out how to drain the treatment out. I will update ASAP. Hope this helps a compitant DIY.. "I can do this" person. Or get a plumber in. Update... Draining the cleaning agent was easier than I thought possible as the towel rail plug is 15mm thread, all I needed to do was close the valves (both in and out) fit a 15mm thru joint with a small piece of 15mm pipe into the plug as mentioned and add a bit of garden hose to go into the loo, the tricky bit was putting the heating valves to fill and opening the towel rail valves so it would flush out the cleaning agent. I did 3 clean flushes till the CH water was clear. Don't forget to do the same process again with the inhibitor to ensure you don't need to do it again soon! Review: Did a good job. - Used this in my heating system after adding new radiator. Left it in for around a couple of weeks during autumn while the heating was only being used a couple of hours in the evening. Flushed the system out, water was a brownish colour, put inhibitor in and refilled it. Found that the heating system is now a lot quieter. ## Features - The fastest acting central heating cleaner on the market, X800 can remove corrosion deposits and scale in 1 hour - Rapid cleaner, removing corrosion deposits and scale in 1 hour - Unrivalled chemical technology reduces circulation time to just 1 hour - Targeted dissolution of corrosion debris - Ideal for powerflushing, also works in cold systems ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B009L4KXIA | | Best Sellers Rank | 22,003 in DIY & Tools ( See Top 100 in DIY & Tools ) 17 in Radiators | | Brand | Sentinel | | Brand Name | Sentinel | | Contains Liquid Contents? | Yes | | Customer Reviews | 4.5 out of 5 stars 865 Reviews | | Global Trade Identification Number | 05016402000239 | | Included Components | Sentinel X800 Fast Acting Cleaner 1 litre | | Item Form | Liquid | | Item Type Name | Cleaner | | Item Volume | 1000 Millilitres | | Item Weight | 1.13 Kilograms | | Item form | Liquid | | Item volume | 1000 Millilitres | | Manufacturer | Sentinel | | Material Features | Liquid | | Material feature | Liquid | | Number of Items | 1 | | Scent | Lemongrass; Aloe vera | | Specific Uses For Product | Boiler, Heating System | | Specific uses for product | Boiler, Heating System | | Surface Recommendation | Stone | | UPC | 798256178412 | | Unit Count | 1000.0 millilitre | ## Product Details - **Brand:** Sentinel - **Item form:** Liquid - **Item volume:** 1000 Millilitres - **Item weight:** 1.13 Kilograms - **Material feature:** Liquid - **Number of items:** 1 - **Scent:** Lemongrass; Aloe vera - **Specific uses for product:** Boiler, Heating System - **Surface recommendation:** Stone - **Unit count:** 1000.0 millilitre(s) ## Images ![Sentinel - X800 Fast Acting Cleaner 1L, targeted central heating system cleaning inside an hour, restores system efficiency by targeting corrosion debris, ideal for hot and cold systems - Image 1](https://m.media-amazon.com/images/I/51ovlwOcoJL.jpg) ## Questions & Answers **Q: Do I just pour in to header tank** A: I think the best idea is to drain system completely - I let it drain for a while then lifted the float valve to stop it refilling, once the flow stopped close the drain tap, add the Jetflow to the header tank, free the the float valve and then let it fill then bleed the radiators and run the system. How long you keep cleaner in the system depends on if your radiators weren't getting very hot - a day if you didn't, mine took three days for one problem radiator to work. Once you're happy you need to drain / run system and repeat several times to clear the cleaner. Add a system conditioner like Sentinal X11 keep in good shape. **Q: Can it be used on plastic central heating pipe** A: Sorry for delay. I have some plastic pipe and it has not caused any problems. **Q: Can this product be used on a car cooling system to unblock a clogged heater matrix?** A: It may do damage to engine and is not recocomended for cars **Q: If I putted “x100 inhibitor” 2years ago can I add “x800 cleaner” to clean the system** A: I would drain out the existing water, put in clean water and add the x800 and run the system as usual for about a week, then drain all the dirty water out and refill with clean water and add new x100. They say it cleans within an hour - but that is for the professional plumber who can stand over it whilst it runs. If it is DIY, then you are not in a hurry to drain it down and get the job finished within the day. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Combi Clean much needed *by R***. on 12 November 2022* My Combi Boiler was Kettleing/Knocking when showering or filling the kitchen sink, I mentioned it when the boiler was serviced and plumber said the plate heat exchanger to heat the water was blocked with limescale and needed replacing, obviously you don't buy a new kettle when it gets bit of limescale on the element! So I opted for this treatment. Best way I could think to add the liquid was the towel heater as it has a nice big fill plug on the top of it and easy access too. I closed both the inlet valves to the towel rail and drained half of the water using the top plug as an tap to control the flow. Once 2 litres out I poured in the treatment refitted the plug and opened the valves, switched on the boiler to circulate the treatment, turned on the hot water tap on to make sure it would clean the plate heat exchanger, 24 hours on there is no knocking or ketteiling, lovely perfect shower at the perfect temperature. Now working out how to drain the treatment out. I will update ASAP. Hope this helps a compitant DIY.. "I can do this" person. Or get a plumber in. Update... Draining the cleaning agent was easier than I thought possible as the towel rail plug is 15mm thread, all I needed to do was close the valves (both in and out) fit a 15mm thru joint with a small piece of 15mm pipe into the plug as mentioned and add a bit of garden hose to go into the loo, the tricky bit was putting the heating valves to fill and opening the towel rail valves so it would flush out the cleaning agent. I did 3 clean flushes till the CH water was clear. Don't forget to do the same process again with the inhibitor to ensure you don't need to do it again soon! ### ⭐⭐⭐⭐⭐ Did a good job. *by G***R on 28 December 2025* Used this in my heating system after adding new radiator. Left it in for around a couple of weeks during autumn while the heating was only being used a couple of hours in the evening. Flushed the system out, water was a brownish colour, put inhibitor in and refilled it. Found that the heating system is now a lot quieter. ### ⭐⭐⭐⭐ Good value for money product *by D***R on 9 January 2026* You can't go far wrong when using this product. It does work and fulfils the task it's produced for. ## Frequently Bought Together - Sentinel - X800 Fast Acting Cleaner 1L, targeted central heating system cleaning inside an hour, restores system efficiency by targeting corrosion debris, ideal for hot and cold systems - Sentinel - X100 Inhibitor 1L, Market Leading Heavy Duty Central Heating Inhibitor, Protection Against Corrosion and limescale, ensures Maximum Heating Efficiency and extends System Life, Clear (88000) - QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System --- ## 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.pl/products/49590152-sentinel-x800-fast-acting-cleaner-1l-targeted-central-heating-system](https://www.desertcart.pl/products/49590152-sentinel-x800-fast-acting-cleaner-1l-targeted-central-heating-system) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-04-25*