£18.50

About as cheap as it gets — within 5% of the all-time low it hit 1 month ago.

£19 today · all-time low £18 (Aug 2026) · usually £19

Sentinel X100 Inhibitor 1L - Central Heating Protection

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Price History & Forecast

Grey patches = out of stock. Cheaper = lower on the chart. Hover for exact prices.

Last 88 days · 88 data points

Historical
Generating forecast…
£21.18 £18.22 £18.87 £19.51 £20.16 £20.80 £21.45 26 July 2026 16 August 2026 07 September 2026 29 September 2026 21 October 2026
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Yellow, X100L-12X1L-GB

Price data last checked 9 day(s) ago - will refresh soon

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Price Distribution

Price distribution over 88 days • 3 price levels

Days at Price
Current Price
73 days 6 days 9 days 0 18 37 55 73 £19 £20 £21 Days at Price

Price Analysis

Most common price: £19 (73 days, 83.0%)

Price range: £19 - £21

Price levels: 3 different prices over 88 days

Description

Sentinel X100 Inhibitor 1L is the industry standard heavy-duty central heating inhibitor trusted by all major boiler manufacturers for reliable system protection. This pH-neutral formulation guards your heating system against corrosion and limescale buildup, which are the primary causes of efficiency loss and premature component failure. By maintaining clean internal surfaces and preventing mineral deposits, Sentinel X100 extends your system's operational life whilst reducing fuel consumption and heating costs. A single 1L bottle treats standard domestic central heating systems, making it an essential maintenance product for any property relying on boiler heating. Regular use ensures optimum system efficiency, protects your investment, and helps minimise energy waste over time.

Key Features

Sentinel X100 Inhibitor provides industry-standard protection against both corrosion and limescale in central heating systems.

Heavy-duty formulation extends the life of your heating system whilst ensuring maximum efficiency and lower fuel usage.

pH-neutral chemical composition makes this inhibitor safe for all central heating pipework, boilers and radiators.

Recommended by all major boiler manufacturers as the trusted inhibitor for maintaining clean, efficient heating systems.

1L capacity treats standard domestic central heating systems with professional-grade corrosion and scale prevention.

Product Specifications

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