How to get hot water on your boat? The answer is simple: with the nautical water heater. The nautical boiler is an electric instrument that heats a certain amount of water depending on its capacity. Compared to classic boilers that are used in homes, nautical boilers are electric only and use electricity and the boat's engine to heat water. At HiNelson you can choose from various types of boilers, especially depending on the capacity and size you need.