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Seaward Marine Water Heater - 20 Gallon

  • 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
  • Item #: 
    Seaward By Whale
    Model #: 
    Multiple Models Available
    Our Price:
    From: $889.99  To: $914.99
    889.99 914.99
    Please enter quantity below.

    Model #
    Shipping Weight
    120 Volt AC
      56.78 Lbs.
    Our Price: $889.99
    240 Volt AC
      55.21 Lbs.
    Our Price: $914.99
    Click the "More Info" button above for specific information about that product.

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

    Available Models

    Model: H2200 - Power: 120 Volt AC
    Model: H2250 - Power: 240 Volt AC

    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


    • Orientation: Horizontal
    • Heat Exchanger Position: Rear
    • Tank Capacity: 20 Gallons
    • Tank Material: Aluminum
    • Exterior Jacket: Stainless steel
    • Power: Specify 120 or 240 Volt AC / 1500 Watts
    • Circuit Breaker: 15 Amp (120 Volt AC) or 10 Amp dual breaker (240 Volt AC)
    • 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

     Proudly made in the USA.
    CA Prop65 warning

    Whale 15 mm Quick Connect Plumbing System Fitting
    Item #: 500091
  • Faucet Tail Assembly Adapter
  • Adapts 1/2" BSP Male Fitting to 15 mm, Tubing
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    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
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    Model #:
    Multiple Colors Available
    Whale 15 mm Quick Connect Plumbing System Fitting
    Item #: 500334
  • Straight Adapter
  • Adapts 1/2" NPT Male Brass Fitting to 15mm Tubing
  •   null
    Model #:
    Seaward Water Heater Sacrificial Anode
    Item #: 501274
  • Material: Magnesium
  • 4" Long, 3/4" Thread
  •   null
    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)
  •   null
    Model #:
    Seaward Marine Water Heater - 20 Gallon
    Item #: 503262
  • Capacity: 20 Gal., Orientation: Vertical, Heat Exchanger: Front
  • Select Voltage / 1500 Watts, Tank Material: Aluminum
  • Dimensions: 20.25" W x 20.25" D x 27" H, Exterior: Stainless
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    From: $1014.99
    To: $1034.99
    Model #:
    Multiple Voltage Choices Available

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