Best Central Heating Systems Accessories of 2025

Last updated on 01/12/2025
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1
Team Controls Magnetic Boiler Filter 22mm Inline for Central Heating inc Full Bore Valves with Metal Handle - Team Supplies TCFILTER
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Team Controls Magnetic Boiler Filter 22mm Inline for Central Heating inc Full Bore Valves with Metal Handle - Team Supplies TCFILTER

Teams
Why we love it
  • Full bore valves included.
  • Efficient central heating protection.
  • Durable metal handle design.
Main Highlights
  • 360 Fully Rotatable Installation
  • Full Bore Isolating Ball Valves with Metal Handles
  • Convenient in Line Fitting
  • Low Profile Drain Valve
  • Actively Filters Magnetite & Non-Ferrous System Debris
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9.8
Exceptional
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9.8
Exceptional
Teams

Team Controls Magnetic Boiler Filter 22mm Inline for Central Heating inc Full Bore Valves with Metal Handle - Team Supplies TCFILTER

Why we love it
  • Full bore valves included.
  • Efficient central heating protection.
  • Durable metal handle design.
Main Highlights
  • 360 Fully Rotatable Installation
  • Full Bore Isolating Ball Valves with Metal Handles
  • Convenient in Line Fitting
  • Low Profile Drain Valve
  • Actively Filters Magnetite & Non-Ferrous System Debris
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Value for Money
2
DB 5300 Central Heating System Freeze & Corrosion Protection – Long Lasting Antifreeze & Corrosion Inhibitor for Boilers, Radiators & Heating Systems – Professional Grade Protection 5 Litre

DB 5300 Central Heating System Freeze & Corrosion Protection – Long Lasting Antifreeze & Corrosion Inhibitor for Boilers, Radiators & Heating Systems – Professional Grade Protection 5 Litre

Chemiphase
Free Shipping
Why we love it
  • Advanced freeze and corrosion protection.
  • Prevents costly damage and repairs.
  • Trusted by heating professionals.
Main Highlights
  • Complete Heating System Protection – DB 5300 provides advanced freeze and corrosion protection for boilers, radiators, and pipework, ensuring your central heating runs efficiently all year round.
  • Prevents Costly Damage – Protects against frozen pipes, rust, and scale build-up, extending the lifespan of your entire heating system and helping to avoid expensive repairs.
  • Professional Strength Formula – Trusted by heating engineers, this high-performance antifreeze and corrosion inhibitor delivers long-lasting protection even in harsh winter conditions.
  • Safe & Compatible – Suitable for use with all types of central heating systems, including mixed metal radiators, aluminium components, and modern condensing boilers.
  • Easy to Use – Simply add to the central heating system water for instant protection. Clear dosage instructions included for hassle-free application.
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9.7
Exceptional
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9.7
Exceptional
Chemiphase

DB 5300 Central Heating System Freeze & Corrosion Protection – Long Lasting Antifreeze & Corrosion Inhibitor for Boilers, Radiators & Heating Systems – Professional Grade Protection 5 Litre

Free Shipping
Why we love it
  • Advanced freeze and corrosion protection.
  • Prevents costly damage and repairs.
  • Trusted by heating professionals.
Main Highlights
  • Complete Heating System Protection – DB 5300 provides advanced freeze and corrosion protection for boilers, radiators, and pipework, ensuring your central heating runs efficiently all year round.
  • Prevents Costly Damage – Protects against frozen pipes, rust, and scale build-up, extending the lifespan of your entire heating system and helping to avoid expensive repairs.
  • Professional Strength Formula – Trusted by heating engineers, this high-performance antifreeze and corrosion inhibitor delivers long-lasting protection even in harsh winter conditions.
  • Safe & Compatible – Suitable for use with all types of central heating systems, including mixed metal radiators, aluminium components, and modern condensing boilers.
  • Easy to Use – Simply add to the central heating system water for instant protection. Clear dosage instructions included for hassle-free application.
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3
Kudos-Trading - Fernox F8 Super Strength Cleaner Boiler Central Heating System Sludge Remover Radiator Protector Inhibitor 500ml Boiler Protection Cleaner
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Kudos-Trading - Fernox F8 Super Strength Cleaner Boiler Central Heating System Sludge Remover Radiator Protector Inhibitor 500ml Boiler Protection Cleaner

Kudos-Trading
Free Shipping
Why we love it
  • Restores system efficiency rapidly.
  • Easy for DIY use.
  • Cost-effective concentrated solution.
Main Highlights
  • New, advanced and improved formula, super strength, rapid, powerful central heating cleaner for heavily contaminated, dirty systems. Strong, citric acid cleaner to restore efficiency; delivers rapid results.
  • Easy to use and apply: Fernox F8 Cleaner can be added to the system via a radiator, filling loop, or a Fernox Tf1 filter, making it simple for both professionals and DIY enthusiasts to use.
  • Non-foaming, faster to flush from system, easy to use; system can operate normally during the cleaning process. It accelerates all cleaning processes; powerflush, manual and magnetic flush. Removes dirt, limescale and other installation and corrosion debris, compatible with all metals and materials, including aluminium.
  • Concentrated solution for cost-effective treatment: One 500ml bottle of Fernox F8 Cleaner is sufficient to treat an average-sized domestic central heating system, offering a cost-effective solution to maintain system efficiency.
  • Eliminates radiator cold spots and system noise, treating up to 130L One bottle treats up to 130 litres, 16 radiators and 250 sqm of underfloor heating which covers 97% of Uk homes
  • Citrate-based cleaner for use in heavily contaminated systems in accordance with bs 7593:2019, Fast-acting; accelerates all cleaning processes including powerflushing, manual and magnetic flushes
  • Compatible with all metals and materials: Safe to use with any central heating system, Fernox F8 Cleaner is compatible with all metals, including aluminum, and a wide range of materials such as plastics and rubber.
  • Rapid results: With a fast-acting formula, Fernox F8 Cleaner works quickly to deliver noticeable improvements in system performance, usually within as little as one hour of circulation.
  • Power Cleaner F8 is supplied in 500 ml bottles. Keep out of reach of children. Do not mix with other chemicals. For further safety information, consult the Safety Data Sheet (sds) Removes sludge, limescale and corrosion debris Non-acidic (pH neutral), non-toxic & non-foaming
  • Inhibitor-friendly: Designed to work in conjunction with Fernox Protector F1, Fernox F8 Cleaner ensures your central heating system remains clean and efficient while also benefiting from long-term protection.
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9.5
Superb
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9.5
Superb
Kudos-Trading

Kudos-Trading - Fernox F8 Super Strength Cleaner Boiler Central Heating System Sludge Remover Radiator Protector Inhibitor 500ml Boiler Protection Cleaner

Free Shipping
Why we love it
  • Restores system efficiency rapidly.
  • Easy for DIY use.
  • Cost-effective concentrated solution.
Main Highlights
  • New, advanced and improved formula, super strength, rapid, powerful central heating cleaner for heavily contaminated, dirty systems. Strong, citric acid cleaner to restore efficiency; delivers rapid results.
  • Easy to use and apply: Fernox F8 Cleaner can be added to the system via a radiator, filling loop, or a Fernox Tf1 filter, making it simple for both professionals and DIY enthusiasts to use.
  • Non-foaming, faster to flush from system, easy to use; system can operate normally during the cleaning process. It accelerates all cleaning processes; powerflush, manual and magnetic flush. Removes dirt, limescale and other installation and corrosion debris, compatible with all metals and materials, including aluminium.
  • Concentrated solution for cost-effective treatment: One 500ml bottle of Fernox F8 Cleaner is sufficient to treat an average-sized domestic central heating system, offering a cost-effective solution to maintain system efficiency.
  • Eliminates radiator cold spots and system noise, treating up to 130L One bottle treats up to 130 litres, 16 radiators and 250 sqm of underfloor heating which covers 97% of Uk homes
  • Citrate-based cleaner for use in heavily contaminated systems in accordance with bs 7593:2019, Fast-acting; accelerates all cleaning processes including powerflushing, manual and magnetic flushes
  • Compatible with all metals and materials: Safe to use with any central heating system, Fernox F8 Cleaner is compatible with all metals, including aluminum, and a wide range of materials such as plastics and rubber.
  • Rapid results: With a fast-acting formula, Fernox F8 Cleaner works quickly to deliver noticeable improvements in system performance, usually within as little as one hour of circulation.
  • Power Cleaner F8 is supplied in 500 ml bottles. Keep out of reach of children. Do not mix with other chemicals. For further safety information, consult the Safety Data Sheet (sds) Removes sludge, limescale and corrosion debris Non-acidic (pH neutral), non-toxic & non-foaming
  • Inhibitor-friendly: Designed to work in conjunction with Fernox Protector F1, Fernox F8 Cleaner ensures your central heating system remains clean and efficient while also benefiting from long-term protection.
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4
LavaTap – Fernox F1 Central Heating Inhibitor 500 ml – Inhibitor for Central Heating Systems, Radiator Inhibitor for Rust and Limescale, Improves Flow, Reduces Noise and Heating Bills
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LavaTap – Fernox F1 Central Heating Inhibitor 500 ml – Inhibitor for Central Heating Systems, Radiator Inhibitor for Rust and Limescale, Improves Flow, Reduces Noise and Heating Bills

LavaTap
Why we love it
  • Protects against rust and corrosion.
  • Extends lifespan of heating systems.
  • Improves efficiency and reduces costs.
Main Highlights
  • Fernox F1 Central Heating Inhibitor: This Fernox F1 central heating inhibitor protects sealed and open vented systems by preventing rust, limescale, and internal corrosion in radiators and boilers
  • Inhibitor for Central Heating: Inhibitor for central heating systems that complies with BS 7593:2019 and helps maintain reliable heating, reduce system wear, and extend component lifespan
  • Radiator Inhibitor and Rust Inhibitor: Dual-purpose radiator inhibitor and rust inhibitor that reduces sludge build-up and improves circulation for faster, more even radiator heat
  • Rust Cleaner and Radiator Flush Compatible: Use after radiator flush with Fernox F3 or F8 to stabilise pH and act as a rust cleaner, keeping internal surfaces clean and scale-free
  • Rust Treatment and System Protector: Though classified as an inhibitor, this product also serves as a rust treatment and functional system protector, helping reduce radiator noise and boiler strain
  • Lower Heating Bills and Energy Use: By maintaining system efficiency, this central heating inhibitor helps lower heating bills, reduce gas consumption, and support long-term energy savings
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9.3
Superb
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9.3
Superb
LavaTap

LavaTap – Fernox F1 Central Heating Inhibitor 500 ml – Inhibitor for Central Heating Systems, Radiator Inhibitor for Rust and Limescale, Improves Flow, Reduces Noise and Heating Bills

Why we love it
  • Protects against rust and corrosion.
  • Extends lifespan of heating systems.
  • Improves efficiency and reduces costs.
Main Highlights
  • Fernox F1 Central Heating Inhibitor: This Fernox F1 central heating inhibitor protects sealed and open vented systems by preventing rust, limescale, and internal corrosion in radiators and boilers
  • Inhibitor for Central Heating: Inhibitor for central heating systems that complies with BS 7593:2019 and helps maintain reliable heating, reduce system wear, and extend component lifespan
  • Radiator Inhibitor and Rust Inhibitor: Dual-purpose radiator inhibitor and rust inhibitor that reduces sludge build-up and improves circulation for faster, more even radiator heat
  • Rust Cleaner and Radiator Flush Compatible: Use after radiator flush with Fernox F3 or F8 to stabilise pH and act as a rust cleaner, keeping internal surfaces clean and scale-free
  • Rust Treatment and System Protector: Though classified as an inhibitor, this product also serves as a rust treatment and functional system protector, helping reduce radiator noise and boiler strain
  • Lower Heating Bills and Energy Use: By maintaining system efficiency, this central heating inhibitor helps lower heating bills, reduce gas consumption, and support long-term energy savings
Show More
5
QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System
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QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System

SPI
15% OffFree Shipping
Why we love it
  • Effortless and accurate dosing.
  • Quick chemical introduction.
  • Compatible with radiator tappings.
Main Highlights
  • Quick and easy dosing of chemicals into central heating systems
  • Gravity-fed dosing method for effortless and accurate chemical introduction
  • Suitable for use with inhibitors, sludge removers or anti-freeze
  • Compatibility: 1/2" BSP radiator tappings
  • Dose a System with up to 1 Litre of Inhibitor, Antifreeze or sludge remover in under 17 Seconds
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9.1
Superb
Black Friday Deal
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9.1
Superb
SPI

QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System

15% OffFree ShippingBlack Friday Deal
Why we love it
  • Effortless and accurate dosing.
  • Quick chemical introduction.
  • Compatible with radiator tappings.
Main Highlights
  • Quick and easy dosing of chemicals into central heating systems
  • Gravity-fed dosing method for effortless and accurate chemical introduction
  • Suitable for use with inhibitors, sludge removers or anti-freeze
  • Compatibility: 1/2" BSP radiator tappings
  • Dose a System with up to 1 Litre of Inhibitor, Antifreeze or sludge remover in under 17 Seconds
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6
Fernox 56599 F1 500 ml Central Heating Protector
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Fernox 56599 F1 500 ml Central Heating Protector

Fernox
31% Off
Why we love it
  • Protects against corrosion effectively.
  • Achieves significant gas savings.
  • Prevents radiator cold spots.
Main Highlights
  • Protects Against Corrosion & Scale
  • When Used with F3 Cleaner Can Achieve 15% Gas Savings
  • Stops Frequent Venting of Radiators
  • Prevents Sticking Pumps
  • Prevents Radiator Cold Spots
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8.9
Excellent
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8.9
Excellent
Fernox

Fernox 56599 F1 500 ml Central Heating Protector

31% Off
Why we love it
  • Protects against corrosion effectively.
  • Achieves significant gas savings.
  • Prevents radiator cold spots.
Main Highlights
  • Protects Against Corrosion & Scale
  • When Used with F3 Cleaner Can Achieve 15% Gas Savings
  • Stops Frequent Venting of Radiators
  • Prevents Sticking Pumps
  • Prevents Radiator Cold Spots
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7
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)
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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)

Sentinel
9% Off
Why we love it
  • Extends system's lifespan efficiently.
  • Protects against limescale, corrosion.
  • Recommended by boiler manufacturers.
Main Highlights
  • The industry standard inhibitor, providing protection for clean central heating systems against limescale and corrosion; recommended by all major boiler manufacturers
  • Heavy duty inhibitor which protects against limescale and corrosion
  • Sentinel X100 Inhibitor will extend the life of the system, ensuring maximum efficiency and minimising fuel usage
  • Ensures optimum system efficiency
  • pH neutral formulation
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8.8
Excellent
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8.8
Excellent
Sentinel

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)

9% Off
Why we love it
  • Extends system's lifespan efficiently.
  • Protects against limescale, corrosion.
  • Recommended by boiler manufacturers.
Main Highlights
  • The industry standard inhibitor, providing protection for clean central heating systems against limescale and corrosion; recommended by all major boiler manufacturers
  • Heavy duty inhibitor which protects against limescale and corrosion
  • Sentinel X100 Inhibitor will extend the life of the system, ensuring maximum efficiency and minimising fuel usage
  • Ensures optimum system efficiency
  • pH neutral formulation
Show More
8
PLUMBING & HEATING BUNGS BY HEATLAB - Eliminate The Need To Drain A Full Central Heating System Down With These Plumbing Bungs, Tank Bung, Radiator Bung Kit - Essential Plumbing Tools And Equipment
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PLUMBING & HEATING BUNGS BY HEATLAB - Eliminate The Need To Drain A Full Central Heating System Down With These Plumbing Bungs, Tank Bung, Radiator Bung Kit - Essential Plumbing Tools And Equipment

Heatlab
Free Shipping
Why we love it
  • Made from safer silicone material.
  • Fits both 15mm and 22mm tanks.
  • Simplifies radiator valve changes.
Main Highlights
  • UNLIKE THE TRADITIONAL RUBBER BUNG Our Bungs Are Made From A Hard Grippy Silicone Material, This Makes Them Safer, Meaning They Are Much Less Likely To Fall Out The Tank When Being Used.
  • MORE VERSATILE - Unlike Normal Plumbing Bungs Our Bungs Have 22mm & 15mm End Caps - This Means They Are Compatible With Bunging Tanks With 15mm And 22mm Open Vents
  • EASY RAD VALVE CHANGE KIT - Changing Radiator Valves, 2 Port Motorised Valve Or 3 Port Motorised Valves Is now easy, no need to drain the whole central heating system down.
  • YOU GENERALLY DO NOT NEED A DRAIN DOWN HOSE To Use These Bungs You Can Use A Radiator Draining Tub Or Plumb Tub And Allow Our Tank Bung Kit To Work Their Magic, Eliminating The Need To Drain Down.
  • UPGRADE YOUR PLUMBING TOOLS AND EQUIPMENT, Keep Our Safer (They Do Not Fall Out Of The Cold Feed) And More Versatile Bungs (15mm/22mm) In Your Plumbing & Heating Tool Bag!
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8.7
Excellent
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8.7
Excellent
Heatlab

PLUMBING & HEATING BUNGS BY HEATLAB - Eliminate The Need To Drain A Full Central Heating System Down With These Plumbing Bungs, Tank Bung, Radiator Bung Kit - Essential Plumbing Tools And Equipment

Free Shipping
Why we love it
  • Made from safer silicone material.
  • Fits both 15mm and 22mm tanks.
  • Simplifies radiator valve changes.
Main Highlights
  • UNLIKE THE TRADITIONAL RUBBER BUNG Our Bungs Are Made From A Hard Grippy Silicone Material, This Makes Them Safer, Meaning They Are Much Less Likely To Fall Out The Tank When Being Used.
  • MORE VERSATILE - Unlike Normal Plumbing Bungs Our Bungs Have 22mm & 15mm End Caps - This Means They Are Compatible With Bunging Tanks With 15mm And 22mm Open Vents
  • EASY RAD VALVE CHANGE KIT - Changing Radiator Valves, 2 Port Motorised Valve Or 3 Port Motorised Valves Is now easy, no need to drain the whole central heating system down.
  • YOU GENERALLY DO NOT NEED A DRAIN DOWN HOSE To Use These Bungs You Can Use A Radiator Draining Tub Or Plumb Tub And Allow Our Tank Bung Kit To Work Their Magic, Eliminating The Need To Drain Down.
  • UPGRADE YOUR PLUMBING TOOLS AND EQUIPMENT, Keep Our Safer (They Do Not Fall Out Of The Cold Feed) And More Versatile Bungs (15mm/22mm) In Your Plumbing & Heating Tool Bag!
Show More
9
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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Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100

Heatlab
Free Shipping
Why we love it
  • Saves time on heating maintenance.
  • Hassle-free, mess-free operation.
  • Universal compatibility maximizes usefulness.
Main Highlights
  • Save Time - 35 Seconds To Dose A Central Heating System With Sentinel, Fernox Or Other Chemicals Easily Add Inhibitor For Central Heating Or Sentinel Leak Sealer
  • Just Dose It Radiator Dosing Tool Makes Life Easy - No Spills Or Mess, Just A Simple Radiator Drain Tray Is Needed Or Plumb Tub Is Needed.
  • Just Dose It Radiator Inhibitor Filler Tool Is Universal, Using A Bsp Radiator Fitting For Easy Compatibility, Fits Practically All Radiators. Which Means Adding Sentinel X100 Inhibitor Is Easy.
  • Upgrade Your Plumbing & Heating Tools, Get Just Dose It Heating Device/Radiator Inhibitor Filler Tool To Easily Add, Central Heating Cleaner, Sentinel X400.
  • Just Dose It Is The Hassle Free Way To Add Chemicals To Your Central Heating System Inhibitor Filling Kit / Central Heating Inhibitor Filling Kit
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8.7
Excellent
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8.7
Excellent
Heatlab

Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100

Free Shipping
Why we love it
  • Saves time on heating maintenance.
  • Hassle-free, mess-free operation.
  • Universal compatibility maximizes usefulness.
Main Highlights
  • Save Time - 35 Seconds To Dose A Central Heating System With Sentinel, Fernox Or Other Chemicals Easily Add Inhibitor For Central Heating Or Sentinel Leak Sealer
  • Just Dose It Radiator Dosing Tool Makes Life Easy - No Spills Or Mess, Just A Simple Radiator Drain Tray Is Needed Or Plumb Tub Is Needed.
  • Just Dose It Radiator Inhibitor Filler Tool Is Universal, Using A Bsp Radiator Fitting For Easy Compatibility, Fits Practically All Radiators. Which Means Adding Sentinel X100 Inhibitor Is Easy.
  • Upgrade Your Plumbing & Heating Tools, Get Just Dose It Heating Device/Radiator Inhibitor Filler Tool To Easily Add, Central Heating Cleaner, Sentinel X400.
  • Just Dose It Is The Hassle Free Way To Add Chemicals To Your Central Heating System Inhibitor Filling Kit / Central Heating Inhibitor Filling Kit
Show More
10
Sentinel X100 Inhibitor 500ml Prevents Limescale and Corrosion Super Concentrate Inhibitor for Central Heating Systems
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Sentinel X100 Inhibitor 500ml Prevents Limescale and Corrosion Super Concentrate Inhibitor for Central Heating Systems

LavaTap
15% OffFree Shipping
Why we love it
  • Super concentrate, highly effective formula.
  • Prevents corrosion and limescale.
  • Eco-friendly, uses less plastic.
Main Highlights
  • Super concentrate Sentinel X100 central heating inhibitor - 500ml treats 100 litres of water
  • Prevents formation of corrosion and limescale in heating systems
  • Uses less plastic than traditional 1 litre bottle
  • Sentinel recognised as a leading UK manufacturer of inhibitor for central heating
  • Sentinel X100 inhibitor can be used with all types of boilers and heat pumps
Show More
8.7
Excellent
Black Friday Deal
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8.7
Excellent
LavaTap

Sentinel X100 Inhibitor 500ml Prevents Limescale and Corrosion Super Concentrate Inhibitor for Central Heating Systems

15% OffFree ShippingBlack Friday Deal
Why we love it
  • Super concentrate, highly effective formula.
  • Prevents corrosion and limescale.
  • Eco-friendly, uses less plastic.
Main Highlights
  • Super concentrate Sentinel X100 central heating inhibitor - 500ml treats 100 litres of water
  • Prevents formation of corrosion and limescale in heating systems
  • Uses less plastic than traditional 1 litre bottle
  • Sentinel recognised as a leading UK manufacturer of inhibitor for central heating
  • Sentinel X100 inhibitor can be used with all types of boilers and heat pumps
Show More

We scanned 1729 products

We reviewed these offers relevant to the Central Heating Systems Accessories within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Teams, Chemiphase, Kudos-Trading, LavaTap, SPI, Fernox, Sentinel, Heatlab, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.
For the best Central Heating Systems Accessories in the market, we considered we took a deep dive into 8646 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that: