World-renowned water heater specially designed for the marine environment. Provides the comfort and convenience of reliable hot water. Benefits: The tank is covered by a five-year Limited Warranty. Ignition-protected thermostat. Attractive polymer jacket resists corrosion from dampness. Glass-lined steel tank is more durable than stainless steel.Options: Available in 6, 12 and 20 gallon models with or without engine heat exchangers. Available for 120V AC or 240V AC.