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Seaward Water Heaters


All heaters feature aluminum hold down brackets, dual wall heat exchangers, ignition protection, and your choice of marine galvanized or stainless steel exteriors.



  • Combination electric/heat exchanger or electric only
  • 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
  • Optional stainless steel or painted aluminum exteriors
  • Ignition protected
  • T & P drain tube included
  • Tempering valves available
 Part #Heat Exchanger Capacity W x D x H Material 
S600 Rear 6 Gallons13″ x 19″ x 13″ Galvanized steel 
F600Front 6 Gallons13″ x 19″ x 13″Galvanized steel
S700Rear6 Gallons13″ x 19″ x 13″Stainless steel
F700Front 6 Gallons13″ x 19″ x 13″Stainless steel
S1100Rear 11 Gallons16″ x 22″ x 16″Galvanized steel
F1100Front11 Gallons16″ x 22″ x 16″Galvanized steel

Additional information

Weight35 lbs
Dimensions16 x 22 x 16 in
MFG Part#


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