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

Q: Do I just pour in to header tank

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

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?

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

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.

Product ID: 49590152

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Details

Brand
Sentinel
Item form
Liquid
Scent
Lemongrass;
Specific uses for product
Boiler Heating
Material feature
Liquid
Item volume
1000

🔥works in hot & cold systems

⏱️1-hour rapid action

⚙️restores system efficiency

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

Description

⚡ Clean fast, heat smart—don’t let corrosion slow you down!

POWERFLUSH READY - Optimized for powerflushing to maximize system longevity and reliability.
EFFICIENCY RESTORED - Revives your heating system’s performance for lower energy bills and better comfort.
VERSATILE APPLICATION - Perfect for both hot central heating and cold systems—one cleaner, multiple uses.
ADVANCED CHEMICAL POWER - Unrivalled formula targets and dissolves stubborn debris with precision.
LIGHTNING FAST CLEANING - Clears corrosion and scale in just 60 minutes—no more waiting around.

Sentinel X800 Fast Acting Cleaner is a 1-litre liquid solution designed to rapidly remove corrosion deposits and scale from central heating systems within one hour. Its advanced chemical technology restores system efficiency by targeting debris, making it ideal for both hot and cold systems and perfect for powerflushing applications.

Specifications

Product Name	Cleaner
Volume	1 Litres
Units	1000.0 millilitre
Brand	Sentinel
Format	Liquid

Have a Question? See What Others Asked

Do I just pour in to header tank

Can it be used on plastic central heating pipe

Can this product be used on a car cooling system to unblock a clogged heater matrix?

If I putted “x100 inhibitor” 2years ago can I add “x800 cleaner” to clean the system

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