Re: Hot water cylinder
The cylinder coil sure can get air locked. But what valve or valves are you using?
Mid position three port, three port diverter, zone valves.
A mid position valve can usually be moved to its mid position and then you would have both legs getting hot. A diverter usually only heats one leg at a time. Zone valves are only electric stop taps so control each leg inidvidually.
If there are no air bleeds about to try for air. Get a bucket if you can and crack the backnut on the hot water side of the valve after making sure the valve is in the right position. This should bleed any air out of the coil, but wait till the system is cold to do it. And be quick or get wet. Watch the carpets and ceiling below.
Its a Plumbers game of chicken.
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