Central Heating Chemicals

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Central heating chemicals cover the full clean-protect-maintain cycle for domestic and light commercial heating systems: system cleansers that remove flux residue, magnetite sludge and limescale deposits, corrosion inhibitors that provide long-term protection once a system is clean, and specialist treatments for noisy systems, leaks and solar or heat pump circuits. Correct chemical treatment is one of the most cost-effective ways to protect boiler warranties, prevent pin-holing, and maintain efficient heat transfer across radiators and heat exchangers. This category is built around the Sentinel range, with further trusted brands to follow. New system commissioning Systems up to six months old still contain flux residue, jointing compound and installation debris from soldering and pipework. Left untreated, this residue accelerates corrosion and copper deposition on heat exchangers. Sentinel X300 is formulated specifically for this pre-commissioning stage, flushing out flux and swarf before the system is dosed with a long-term inhibitor. Skipping this step on a new install is one of the most common causes of early boiler warranty claims relating to internal corrosion. Existing system cleaning and sludge removal Older systems accumulate magnetite (black iron oxide sludge) that restricts flow, causes cold spots on radiators, and forces pumps and boilers to work harder — increasing fuel consumption and noise. Sentinel X400 is the standard rapid-clean treatment for existing systems, breaking down and dispersing sludge ahead of a power flush or drain-down. For heavily fouled systems, Sentinel X800 is a heavy-duty formulation designed for use with power flushing equipment, giving faster results where deposits are severe or the system has never previously been treated. Long-term corrosion protection Once a system has been cleansed and flushed, it must be refilled with a corrosion inhibitor — this applies to both open-vented and sealed systems, including combi boiler installa