How To Unblock Central Heating Pipes __exclusive__ Jun 2026

This usually indicates trapped air, which requires bleeding rather than unblocking.

An engineer connects a high-flow pump to your system, firing water and chemicals at 40+ litres per minute to scour the pipes clean. Cost: £300–£600. Worth it for a full house.

Once your pipes are clear, keep them that way: how to unblock central heating pipes

Before we dive into the solution, it's essential to understand the common causes of blockages in central heating pipes. These include:

Tighten the bleed plug, reopen the radiator valves, and turn the heating on. This usually indicates trapped air, which requires bleeding

Have a licensed technician check your system pressure, test the water quality, and clean your magnetic filter once every year.

Run the heating for 2 to 4 weeks (depending on manufacturer instructions) to let the chemical break down the sludge. Worth it for a full house

Catch the black water immediately as it leaks from the loosened joint. Open the bleed valve to speed up the draining.

If chemicals didn't work or a specific radiator is dead, you need to physically clear the pipes. This method involves using mains water pressure to blast the blockage.