Any good ways for purging air from the hot / cold water supply automatically (not central heating)?
The system is gravity-fed. Only the kitchen has a direct connection to mains cold water - other rooms are fed from a tank. I have access to most of the pipework, so I can add a standpipe if needs be, but I want to avoid that if possible.
I've been fiddling about with the taps to flush the air out, but it's not very satisfactory (the problem comes back after a couple of days/weeks). I can't figure out where is the air coming in. I don't think there are any sections of pipe that are below ambient pressure - any explanation would be appreciated.
Oh yeah. It's an upper-floor maisonette (one floor) and the header tank is in the attic, above the boiler.
The normal way that a plumber would use is to pull out washing machine. Turn off isolation valves, connect the flexible cold to the "hot" open both valves and the rush of mains water will push out any air in the system. Don'y forget to turn on hot taps one at a time to ensure success. THIS DOES WORK
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