Whale S360EW 3 Gallon 12 Volt Marine Water Heater W/ Mounting Brackets

Save $521.56
AttwoodSKU: S360EW

Sale price$640.32 Regular price$1,161.88
In stock (2 units)
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Whale S360EW 3 Gallon 12 Volt Marine Water Heater. The S360EW is an electric only 12 V Water Heater brand new to the marine industry. Ideal for outboards the water heater connects to 12 V power supply meaning there is no need for a generator, inverter or shore power.

The compact and electric-only design of the water heater allows for flexible installation in tight spaces like the galley or transom, freeing up valuable onboard space. With rapid heat-up times, it provides hot water in under an hour and boasts efficient heat retention for up to 10 hours. Ideal for deck showers and wet suits, it delivers 3 gallons of hot water at a time. Safety features include integrated temperature and pressure valves, thermal cut-out, and heat indication output. Plus, an integrated anode ensures longer life, while a relay enables easy switching at the helm.

Heating water with 12V requires approximately 40 amperes at 12 volts for a 30-degree Celsius temperature increase, consuming just over 5 ampere-hours. Additionally, some new inverter heat pumps offer premium designs suitable for various indoor installations.


  • Side-mounted combination electric/heat exchanger
  • Robust manufacturing
  • Hold down brackets welded to the inner tank
  • Double-wall heat exchangers
  • Integrated pressure relief valve
  • Temperature and pressure drain tube included
  • Sturdy, robust epoxy coated exterior
  • Ignition protected

Warning: Product may contain materials cautioned by California Proposition 65


capacity 3 Gallon
connection type 1/2"" NPT Female
current draw 30 Amps
Dimensions 13-1/4" H x 13" W x 13-3/4 Deep (Includes Mounting Brackets)
material White Aluminium
Max Temp. 140° F
output voltage 12 Volt DC
Power 300 Watt
weight 15 lbs (6.8kg)

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