When selecting a professional glasswasher for a professional catering operation, it is important to make the right choice considering the size of the glasses. The parameter indicated as "maximum glass height" must correspond to the glassware actually used in the operation. The size of the baskets is a determining factor for the number of glasses washed during one washing cycle. The placement of the professional glasswasher will indicate whether a model with a drain pump is needed, or if the drainage will be handled by gravity. If the washer is connected to a drain higher than the washer's drain valve, a drain pump is necessary.