Seaward Water Heaters
Seaward Seaward hot water heaters running on shore power or off heat exchangers
  • Seaward Water Heaters

Seaward Water Heaters

Seaward marine water heaters run on 110/120V AC shore power or convert engine heat with heat exchangers while underway to efficiently create hot water. These water heaters can hold anywhere from 6-11 gallons of water.

All Seaward heaters have galvanized steel exterior with aluminum tank interiors, hold down brackets and ignition protection. Dual wall heat exchangers are front mounted on "F" models and rear mounted on "S" model water heaters.

IN STOCK - Available for pickup  
Additional shipping charges apply
$339.94 / ea
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Tech Spec Product Info User Generated Content


  • Combination electric/heat exchanger or electric.
  • Inner tanks made from Alcoa Alclad aluminum alloy.
  • Hold down brackets welded to inner tank.
  • UL (120v models) or CE (240v models) approved.
  • Temperature pressure relief valve.
  • Magnesium anodes available.
  • Large 1/2-inch drain valve.
  • Exteriors are marine galvanized steel.
  • Ignition protected.
  • T & P drain tube included.
  • Tempering valves available.


Available in unfinished or white, with the option of heat exchanger in front or rear.
Item #  Heat Exchanger  Capacity  Overall Size" 
SWD F600  Front  6 Gallons  13W x 19D x 13H 
SWD F600W  Front/White  6 Gallons  13W x 19D x 13H 
SWD F1100  Front  11 Gallons  16W x 22D x 16H 
SWD F1100W  Front/White  11 Gallons  16W x 22D x 16H 
SWD S600  Rear  6 Gallons  13W x 19D x 13H 
SWD S600W  Rear/White  6 Gallons  13W x 19D x 13H 
SWD S1100  Rear  11 Gallons  16W x 22D x 16H 
SWD S1100W  Rear/White  11 Gallons  16W x 22D x 16H 
BRAND: Seaward
Type: Water Heater
4.7 9

It's the same, but not the same :)


Replaced 17 year old water heater with this 11 gal. of what I thought was the same make and model. Looks the same. Screw holes for mounting were not in same locations so had to pilot drill new holes for new screw locations. This unit is also a little bit bigger than last one. All connections are in the same location and fit perfectly. No problem installing and connecting it other than where boat manufacturer decided to put it. Works great, just follow nicely written book of instructions.

Capt'n Jack

Narragansett Bay RI


It made replacing old heater simple


Same basic design as Admiral.Resued old fittings & improved rust control. Easy old out & new in without any alterations to boat.


Northern Indiana

grateful to find one at a fair price


fast shipping and I needed that due to no hot water, thanks


Grand Cane, La


I hope I don't have to buy this product,


We installed our water heater in our sailboat


Massena, NY

Great Heater


I am very happy with this purchase so went live this weekend and we can actually see steam on a hot summer day...never had that before.


Norwalk CT


I would buy this item again


Depending on location, very easy to install.

Boat Nut

Lake Geneva, WI.


Good replacement, Easy install


I replaced my original equipment round upright heater with this unit when the 30 year old unit started leaking. The newer box design fits well in my engine room. I needed to put a heat sensor on the tank itself and was able to remove a cover panel easily to epoxy the sensor on. Heats quickly and very hot which is excellent for 2 back to back showers each morning. I'm very happy with this product.

2 Bucks

Pt Orchard, WA


Exactly what we were looking for


Ordered this to replace the original Seaward installed in our 2000 MH.Great price.




Great product


Easy to install. Works great.Installed in my boat.


Conroe, Texas


Seaward Water Heaters



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