Power Flushing

Why your system needs flushing

Over time, central heating systems accumulate sludge, rust, and debris — especially in older properties with steel radiators. This buildup restricts water flow, makes your boiler work harder, and can cause cold spots on radiators, noisy pipes, and even boiler breakdowns.

Signs your system needs a power flush

Cold spots at the bottom of radiators, a system that takes a long time to heat up, noisy boiler or radiators, discoloured water when you bleed radiators, or frequent breakdowns — these are all signs that sludge may be the problem.

Essential before a new boiler

We always recommend a power flush before fitting a new boiler. Dirty water from an old system can damage a new boiler's heat exchanger within months, potentially voiding your warranty. It's a small investment that protects a much bigger one. After flushing, we add a chemical inhibitor and fit or check your magnetic system filter.

How much does a power flush cost?

The cost of a power flush depends on the size of your system and the severity of the sludge buildup. Here's a guide for typical Surrey properties — and I've written a full, honest cost guide covering what affects the price, UK averages, and when a flush isn't worth your money:

A power flush typically takes 4–6 hours. We flush each radiator individually, test water quality throughout, and don't stop until the water runs clear. At the end we add a quality inhibitor and check or fit a magnetic system filter to catch any future debris before it reaches your boiler.

Areas we cover for power flushing

We carry out power flushing across Surrey from our base in Addlestone. Our regular service area includes Weybridge, Chertsey, Walton-on-Thames, Woking, Byfleet, Shepperton, Egham, Staines, Ashford, and Englefield Green. If you're nearby, give us a call — we probably cover your area.