This is from your owner's manual. This is the last time I'm doing your homework for you
Freshwater System The 335 comes with a pressurized freshwater system. The freshwater pump is activated by the freshwater switch on the helm switch panel and supplies water from the 44 gallon water tank to the freshwater components on board. The freshwater pump and optional water heater can be accessed through the panel on the aft wall inside the helm storage compartment. The water tank is located aft, next to the transom.