Fitting a heater into a tight compartment requires something shaped to slide into narrow spaces. The horizontal layout of these units makes them a practical choice for tucking away under a bunk or inside a low locker. They warm up the water while the engine is running or through the shore power connection once you tie up for the night. You get a hot shower or warm water for the galley without taking up valuable vertical room. It stays hidden out of the way until you need a comfortable wash after a long day.
Surecal horizontal water heater
Efficient horizontal water heating for marine vessels.