Boat Water Heater

water heater
Water heating is a thermodynamic process using an energy source to heat water above its initial temperature. Typical domestic uses of hot water are for cooking, cleaning, bathing, and space heating. In industry, both hot water and water heated to steam have many uses.
a heater and storage tank to supply heated water
An appliance for supplying hot water for purposes other than space heating or pool heating.

boat
ride in a boat on water
gravy boat: a dish (often boat-shaped) for serving gravy or sauce
A small vessel propelled on water by oars, sails, or an engine
(in general use) A ship of any size
A serving dish in the shape of a boat
a small vessel for travel on water