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Small commercial apartment boiler. Underground return had been placed on the floor around the perimeter of the building. Yes it will be flushed out. The question is at what point is a wet return a dry return. The new boiler water line is 52” from the bottom of the pit and the return is 26” above the bottom of the pit. The Hartford tee is 48” from the pit floor. So they way I see it is I have about 22” of water above the return that is around the building. So i am pretty sure I won’t have a problem but my buddy insists on putting in a false water line.
The photos are of the old boiler so please just look at the return pipe that drops into the pit.