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I plan to use two columns on my boiler.
First column a 6 plate 4" CD with dephleg feeding out and down into the bottom of the second column a 750mm high 4" CD packed section. Most multi columns sit on a bench or are separate from the boiler and need a drain back to the boiler otherwise column two will flood. If the bottom of column two is capped and does not drain back to the boiler or column one do you think the boiler heat would be enough to prevent flooding.