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Here's one I should have done earlier, I know. But we are where we are. A drain down depends on gravity doesn't it? So all the piping that's below the level of the drain cock level (no rads have drain points) will still be full. So - just a thought - what if I turn the circulation pump on for a minute or two to 'force' the bottom few centimeters of water out? Switching the pump on for a minute or so, will I knacker the pump? Any Welsh plumbers on the board will be most welcome to answer.
