Assuming you are talking about a standard home dishwasher:
A drawer dishwasher typically uses 6-10 gallons of water per cycle. This is significantly less than a traditional top-loading dishwasher, which can use up to 15 gallons of water per cycle. Even the most efficient top-loading dishwashers only use around 12 gallons of water per cycle. So if you're looking to save on your water usage, switching to a drawer dishwasher is a good option.