Amazingly I could not find any information about this on the internet!!!
I am renting a flat and the only option I have if I want a dishwasher is to buy a tabletop/compact dishwasher. Because of the layout of the kitchen, the only option I would have is to run the drainpipe into the kitchen sink…i.e.not connected below the sink to the trap, but just running the drain into the main sink from above the work surface where the dishwasher would be placed. Is this feasable? Would I need to make the drain pipe go up and then down or could i run it horizontal along the worktop and then down into the sink fr it to work properly?
Best Answer
The reason for the high loop or air gap in dishwasher drains when installed below the counter are because of the risk of drain water being pushed back into the dishwasher. If you have a clog in the sink and don't have that high loop, water can drain into the dishwasher and flood out your kitchen. So with a countertop dishwasher, I don't see the need for the high loop since the drain hose is already above the level of the countertop.