Seaward Marine Water Heater - 20 Gallon
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Seaward Marine Water Heater - 20 Gallon
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Seaward Marine Water Heater - 20 Gallon

  • Capacity: 20 Gal., Orientation: Horizontal, Heat Exchanger: None (Electric)
  • Power: 240 Volt AC / 1500 Watts, Tank Material: Aluminum
  • Dimensions: 16" W x 16" H x 32" D, Exterior: Stainless Steel
  • Item #: 
    Seaward By Whale
    Model #: 
    Shipping Weight: 
    58.45 Lbs.
    List Price: 
    Our Price:
    Status:      In Stock



    Shipping weight reflects calculated Dimensional Weight and is not actual product weight - see here for details.

    Seaward Marine Water Heaters


    • Available in multiple configurations to suit your installation requirements
      • Combination electric / heat exchanger or electric-only models
      • Versions available for 120 and 240 Volt AC systems
      • Wide range of tank capacities: 3, 6, 11, 20 or 28 gallons
      • Horizontal or vertical mounting
    • Exterior jackets available in marine galvanized steel, stainless steel or white epoxy-coated aluminum
    • Robust manufacturing
      • Mounting brackets welded to inner tank
      • Double-wall heat exchangers
      • Large 3/4" drain valve
    • Easy-to-use safety controls
      • Integrated pressure relief valve
      • Temperature and pressure drain tube included
    • Magnesium anodes sold separately (recommended for longer tank life)
    • Ignition protected


    • Seaward Model No. H2250E
    • Orientation: Horizontal
    • Heat Exchanger Position: None (electric only)
    • Tank Capacity: 20 Gallons
    • Tank Material: Aluminum
    • Exterior Jacket: Stainless steel
    • Power: 240 Volt AC / 1500 Watts
    • Circuit Breaker: 10 Amp dual breaker
    • PSI Rating: 150 PSI
    • Dimensions: 16" W x 16" H x 32" D
    • Meets or exceeds all ABYC, CE and UL standards

    For further details including installation and operating instructions see Owner's Manual for this product

    WARNING: This product MAY expose you to chemicals, which are known to the State of California to cause cancer, birth defects and/or other reproductive harm. For more information go to

    Trident 250/100 Flex Marine Wet Exhaust and Water Hose - 5/8 Inch
    Item #: 302026HID058
  • Diameter: 5/8" ID, Color: Black
  • Material: Hi Temp EPDM Rubber, Wire Reinforced, Tolerance: 280° F
  • Excellent Flexibility and Bend Radius, Sold by the Foot
  •  Include

    Model #:
    Whale Quick Connect Flexible Heater Connector
    Item #: 503151
  • Type: NPT Male to BSP Female, Stainless Steel Braided Hose
  • Fittings: 1/2 Inch NPT Male End and 1/2" BSP Female End
  • Length: 13-3/4 Inches (350 mm)
  •  Include

    Model #:
    Whale 15 mm Quick Connect Plumbing System Fitting
    Item #: 500334
  • Straight Adapter
  • Adapts 1/2" NPT Male Brass Fitting to 15mm Tubing
  •  Include

    Model #:
    Whale 15 mm Quick Connect Plumbing System Fitting
    Item #: 500091
  • Faucet Tail Assembly Adapter
  • Adapts 1/2" BSP Male Fitting to 15 mm, Tubing
  •  Include

    Model #:
    Seaward Water Heater Sacrificial Anode
    Item #: 501274
  • Material: Magnesium
  • 4" Long, 3/4" Thread
  •  Include

    Model #:
    Whale X High Performance Tubing for Quick Connect Plumbing System - 15mm
    Item #: 500099
  • Diameter: 15mm ID, Select Color
  • Material: Polyethylene, Tolerance: 180 Max PSI Cold, 90 Max PSI Hot
  • Sold by the Foot, Tested to Withstand 3x Its Rated Pressure

    Model #:
    Multiple Colors Available
    Seaward Marine Water Heater - 20 Gallon
    Item #: 503265
  • Capacity: 20 Gal., Orientation: Horizontal, Heat Exchanger: Rear
  • Select Voltage / 1500 Watts, Tank Material: Aluminum
  • Dimensions: 16" W x 16" H x 32" D, Exterior: Stainless Steel
    From: $624.99
    To: $644.99
    Model #:
    Multiple Voltage Choices Available

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