Sentinel x400
Sentinel x400 for sale on Ireland's largest auction and classifieds sites
Budget picks — under £17
Central heating system • Cleaner 1ltr solution • Specifically storage tank - Free postage - New and Used
New - Free postage - New and Used
Heating system • Experience efficiency convenience • Sentinel x400 central - Free postage - New and Used
Cleaner systems older • Than six months • X400 high performance - Free postage - New and Used
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Boiler case seals • Sentinel leak sealer • Internal application seal - Free postage - New and Used
Browse 26 sentinel x400 listings currently in our index. Prices range from £8.66 to £464.68, with an average of £45.76. Whether you are hunting for a bargain or looking for a top-spec model, the selection below covers all price points — new, used and refurbished. More about sentinel x400 →
Your heating system • Sentinel internal leak • Sealer litre container - Free postage - New and Used
Sentinel x400 high • Performance cleaner rapid • Dose simplest ever - Free postage - New and Used
Sentinel x400 hydronic • Storage tank water • Heater restore central - Free postage - New and Used
Sentinel leak sealer • Internal application seal • Leaks weeping joints - Free postage - New and Used
Mid-range — £17 to £22
That your water • Missing filling nozzle • Scruffy packaging see - Free postage - New and Used
Sentinel internal leak • Sealer reliable efficient • Leaks this litre - Free postage - New and Used
Sentinel x100 x400 • X800 - Free postage - New and Used
Sentinel x400 system • Restorer storage tank • Water heater trusted - Free postage - New and Used
High performance cleaner • Specifically cleaning older • Central heating systems - Free postage - New and Used
Central heating system • Restorer litre solution • Help solve circulation - Free postage - New and Used
Twyford optima49 push • Button cistern - Free postage - New and Used
Central heating • Experience benefits clean • System sentinel x400 - Free postage - New and Used
Ideal holding open • Garage barn doors • Over 900mm wide - Free postage - New and Used
Premium — over £22
X400 high performance • Cleaner sludge remover • Old systems x800 - Free postage - New and Used
Sentinel rapid dose • Leak sealer new • Sealed - Free postage - New and Used
This litre bottle • Will treat typical • Radiator system can - Free postage - New and Used
Sentinel x400 high • Performance cleaner specifically • Cleaning older central - Free postage - New and Used
New - Free postage - New and Used
Suitable use all • Types indirect central • Heating system can - Free postage - New and Used
Bottles x100 without • Lids one bottle • Lid but sealed - Free postage - New and Used
All new stock • Joblot sentinel x300 • X400 x800 total - Free postage - New and Used
Try this: vaillant combi | forced air heater | worcester controls | babyliss gas energy cells | vaillant spares | cylinder thermostat | flow switch | 110v heaters | 220v generator | air conditioner
🔥 Best eBay deals on sentinel x400
See all listings on eBay →These 26 listings for sentinel x400 are the lowest-priced items currently in our index. Prices are sorted ascending so you can quickly gauge the market before going further.
Sentinel X800 Central Heating
Central heating system • Cleaner 1ltr solution • Specifically storage tank
£9
Sentinel X800 Central Heating
New
£12
2x Sentinel X400 Central
Heating system • Experience efficiency convenience • Sentinel x400 central
£13
Everything you need to know about sentinel x400
Whether you are looking for a brand-new or second-hand sentinel x400, eBay offers one of the largest selections available online. With 26 active listings at the time of this page's last update, you have plenty of choice across different conditions, sellers and price points. The cheapest option currently starts at £8.66, while premium listings can reach £464.68 — giving you a wide budget spread to work with. The average price of £45.76 can serve as a useful benchmark: listings below this tend to be used or auction-style, while those above often include extra accessories, warranties, or are sold by professional sellers with high feedback scores. Always check the seller's feedback rating and return policy before committing to a purchase. If you need the item quickly, filter by "Buy It Now" to avoid the uncertainty of auctions. For used items, look closely at the condition description and photos — terms like "good", "very good" and "like new" can mean very different things depending on the seller.