Enjoy hot water heated dockside with 120V AC power or with engine heat when underway. Heaters feature a marine-grade aluminum case and cladded aluminum tank with 1500W heating element and large diameter, dual-loop heat exchanger. Circuitry is ignition protected, and each heater includes a high-temperature limiter with automatic reset. All plumbing and electrical connections are “front” located. Use of a magnesium anode is recommended to extend tank life.