Chemical flush
A chemical flush adds a cleaner to the system and circulates it using the boiler’s own pump for a period before draining. It’s cheaper and quicker, and suits lightly affected systems or routine maintenance.
Power flush
A power flush uses a separate high-flow pump to force water and chemicals through at pressure, dislodging heavier sludge that a chemical flush can’t shift. It’s the deeper clean, for systems with real build-up or before a new boiler.
Magnetic filter
A magnetic filter isn’t a flush — it’s a small unit fitted to the pipework that catches circulating debris continuously. After a flush it keeps the system clean; on its own it slows build-up but won’t clear an already-sludged system.
Which you need
Light symptoms or maintenance point to a chemical flush. Clear signs of sludge — cold spots, dark water, a noisy boiler — call for a power flush. Either way, a magnetic filter is worth fitting to protect the result.
Not sure whether you need a power flush, a chemical flush or just a filter? We’ll assess your system and recommend the lightest option that’ll actually work. South Manchester and Cheshire.
See our power flushing service
