Water Heater 20 Gal 4500 W 240V (Discontinued)

20-Gallon Hot Water Heater with Heat Exchanger - 4500W/240V. A marine water heater is simply a small, insulated tank downstream of the pump. You must have a pressurized water system to operate a water heater. The pump draws water from the storage tank(s) and fills the water heater tank. Inside the water heater is an electrical heating element and usually a coiled tube called a heat exchanger. When AC power is available, the electrical element (controlled by a thermostat) heats the water. Away from the dock, the hot engine coolant is routed through the coiled tube to heat the water in the tank when the engine is running.. Water heaters have four threaded ports. The tank inlet connects via a tee-connector to the outlet hose from the pump. A check valve is required in this line or in the heater to prevent hot water from migrating back toward the pump. The outlet connection supplies heated water to the hot side of all faucets, also using tee-connectors. The other two ports are for the heat exchanger connection, which varies depending on engine installation. Use only metal fittings to plumb a water heater, never plastic. If a pressure-release valve isn' t integral, the heater will have a fifth port for this essential component.. Benefits: Simple installation - retrofits to most on-board pressure systems. Proven long-life design. Withstands the rigors of the marine environment. Glass-lined steel tank is more durable than stainless steel. Attractive polymer jacket resists corrosion from dampness. Ignition-protected, adjustable thermostat. Round tanks are designed to withstand more pressure than square tanks. Glass-lined steel tank for long life and high efficiency. Environmentally friendly CFC-free foam insulation. Replaceable magnesium anode to protect tank and neutralize acids in the water. The tank is covered by a five-year Limited