You might be surprised to learn that you don't need to plumb in most small bean to cup coffee machines. Instead, they typically have a built-in water tank that you can refill as needed. This is great news if you're short on counter space, as you won't have to worry about connecting the machine to your water line.nnJust keep in mind that you'll need to refill the tank more often than if the machine was plumbed in. Additionally, some people find that the quality of the coffee suffers when made with water from a tank, so be sure to experiment to see what works best for you.