I just installed a new Kohler toilet. After it flushes, the water in the bowl drains out within a few minutes-there is just a small amount that remains at the very bottom. The water level after the flush is also not very high to begin with. I added more water to the bowl to see what would happen. Still drains out quickly, This was not happening with the old toilet; also the second bathroom toilet works fine , maintains water level and shares the vent with this one. Could this be a bowl manufacturing defect or is it something else?

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Could this be a bowl manufacturing defect or is it something else?

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BINGO!! Read on, Sometimes in casting the bowl there is a small bubble in the china. Instead of junking the bowl the manufacture will put a porcelain patch over the hole and send it on through. On occasion the patch will fail allowing the water to seep out of the bowl. If that's the case you would have a full bowl after you flushed and the bowl filled but some time later you would notice a drop in the bowl level. The only other thing might be if you dropped something in the bowl and cracked it. If you're worried about where the water's going, in both cases it drains back down into the sewer and not under the bowl on the floor.To check the bowl must be pulled, filled and put up on saw horses. You can thes see if there's any leakage from the bowl. Good luck, Tom