We are reviewing coffee makers with removable water tanks in this article. That means the reservoirs were designed to be detached. It minimizes the chances of any danger occurring during the process. However, make sure to follow the instructions. Some appliances will require you to rotate the base to access the reservoir. Other units have a release button for simple detaching. The manual will explain the best way of removing the reservoir without damaging it. The tank is probably plastic, but you should pay attention not to hit it on the countertop, or any other surface. Please be careful while washing it, too.