LavaTap Sentinel X100 Central Heating Inhibitor (1 Litre) is a high-performance additive that protects sealed, open-vented, and combi boiler systems from internal damage caused by corrosion, rust, limescale, and sludge. Designed to maintain system health and improve long-term reliability, this radiator inhibitor fluid helps reduce maintenance costs and enhance heating performance across the entire system. Each 1-litre bottle treats up to 100 litres of system water, which typically covers 10 radiators or a similarly sized underfloor heating setup. The product is safe for use with all standard system materials including aluminium, copper, and steel. Its non-toxic and pH neutral formulation is compatible with mixed-metal systems and contributes to cleaner, quieter operation by reducing boiler noise and water imbalance. By preventing sludge buildup and improving flow, LavaTap X100 supports more efficient heat transfer, which can help lower gas usage and reduce energy waste over time. Easy to dose via radiator or filling loop, it is trusted by both heating engineers and DIY users as part of regular system maintenance. Use this central heating inhibitor to extend the lifespan of your system and maintain cleaner, more balanced water throughout. For best practice, check inhibitor levels annually and re-dose every five years, in line with BS 7593 system maintenance standards.