How-to: Drain your heating system There are several reasons for draining a central heating system: leaking radiators, sludge causing a blockage, worn out or failed valves. None of these problems is difficult to rectify. This How-to shows you how to easily, logically and safely drain and refill open wet system installations and systems run by a multi-point or combination boiler.

What you'll learn Here's an overview of what this How-to covers: Cleaning the system Draining an open-vented wet system Draining a multipoint system or combination boiler Refilling the system Get the How-to This How-to gives step-by-step instructions to help you through the job from start to finish. We've created the How-to in a format that allows you to print it out and use it on the job. To view and print the How-to, press 'Download file'. You'll need Adobe Acrobat. If you haven't already installed Adobe Acrobat, click 'Get Acrobat' for a simple download. Get Acrobat