If draining a central heating system to alter pipework to some radiators under the floor boards of the ground floor in plastic. Is it advisable to open the upstairs air vents to drain all the water out of the upstairs rads.
No real need to empty the upstairs rads. You can shut them all down @ both valves to retain their system water (if it's all clean) and crack open one of the feeds under a valve to allow the pipework to empty, if you are draining downstairs via their external/internal drain offs. Stops the upstairs rads from flash rusting.
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