Shop Isotemp Water Heaters

Water heaters designed for long life and high performance in the marine environment.

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Isotemp marine water heaters are very rugged, designed to last for years of trouble-free service. Thanks to the Isotemp reputation for dependability, long life, and handsome design, Isotemp marine water heaters add value to every installation.

Unlike common aluminum-core water heaters, the Isotemp marine water heater features a brushed stainless steel cover as well as a 316-grade acid-resistant stainless steel inner tank that is backed by a 5-year limited warranty. Isotemp achieves the highest capacity by optimized positioning of the engine water heat exchanger as well as the electrical immersion heater. They are positioned in the lowest part of the tank where the water is coldest in order to ensure equal heating of all the water in the tank. The water inlets and outlets are specially designed to minimize the mixture of cold and hot water.

Water is heated to 160+ degrees with just the electric heating element alone. With the engine heat exchanger, water can be heated to 190+ degrees. The innovative thermostat-controlled mixing valve mixes ships water with hot water to deliver the temperature you want at the faucet. This mixing action speeds recovery time and extends the volume of hot water you get from a smaller tank.



Webasto provides high-quality equipment that deliver robust solutions to marine customers and contribute to enhancing on board comfort.



Isotherm, a proven leader in marine refrigeration, is specified by over 160 major boat builders around the world.