I have an old oil fired ch heating gravity fed system with expansion tank in loft, my question is when draining the system to clean out , flush and inhibit I have 2 drain cocoa outs on the patio, are they both the central heating? If so do I need to drain in a certain patter or procedure to get the water to flush through the radiators?
Any light shed would be appreciated
Thanks
Tom
Any light shed would be appreciated
Thanks
Tom