Kuuma Products 120V 11 Gallon Water Heater - Front Mount, Front Heat Exchange Marine water heaters are a convenient piece of equipment for boats that provide several conveniences from home. Boats are often used for a variety of different purposes and having hot water on board for clean-up before or after a meal or warming up after a swim is a game changer. Check out Wholesale Marines stock of hot water heaters including the Kuuma 120V 11 Gallon Water Heater. Boat hot water heaters should be buil