Seaward Products
is a major manufacturer of marine 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. Available capacities are: 3, 6, 11, 20, and 28 gallon
models, horizontal or vertical. All models are available
without heat exchangers.
Check with us before ordering regarding plumbing requirements for your particular installation.
Seaward Water Heaters Feature:
 | 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 |
Click on model number for larger picture.
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| S1900 | HF2200 | H2850 |
| Model Number | Capacity | Exchanger | Orientation | Overall Size | Exterior Material | Shipping Weight |
| S3001 | 3 gallons | Side | Horizontal | 14½w x 14d x 13"h | Painted Aluminum | 11 lbs. |
| S6001 | 6 gallons | Rear | Horizontal | 13w x 19d x 13"h | Marine Galvanized Steel | 25 lbs. |
| F6001 | 6 gallons | Front | Horizontal | 13w x 19d x 13"h | Marine Galvanized Steel | 25 lbs. |
| S7001 | 6 gallons | Rear | Horizontal | 13w x 19d x 13"h | Stainless Steel | 30 lbs. |
| F7001 | 6 gallons | Front | Horizontal | 13w x 19d x 13"h | Stainless Steel | 30 lbs. |
| S11001 | 11 gallons | Rear | Horizontal | 16w x 22d x 16"h | Marine Galvanized Steel | 30 lbs. |
| F11001 | 11 gallons | Front | Horizontal | 16w x 22d x 16"h | Marine Galvanized Steel | 30 lbs. |
| S12001 | 11 gallons | Rear | Horizontal | 16w x 22d x 16"h | Stainless Steel | 30 lbs. |
| F12001 | 11 gallons | Front | Horizontal | 16w x 22d x 16"h | Stainless Steel | 30 lbs. |
| S18001 | 20 gallons | Front | Vertical | 20¼w x 20¼d x 27"h | Marine Galvanized Steel | 47 lbs. |
| S19001 | 20 gallons | Front | Vertical | 20¼w x 20¼d x 27"h | Stainless Steel | 47 lbs. |
| H20001 | 20 gallons | Rear | Horizontal | 16w x 32d x 16"h | Marine Galvanized Steel | 50 lbs. |
| HF20001 | 20 gallons | Front | Horizontal | 16w x 32d x 16"h | Marine Galvanized Steel | 50 lbs. |
| H22001 | 20 gallons | Rear | Horizontal | 16w x 32d x 16"h | Stainless Steel | 50 lbs. |
| HF22001 | 20 gallons | Front | Horizontal | 16w x 32d x 16"h | Stainless Steel | 50 lbs. |
| H28502 | 28 gallons | N/A | Horizontal | 16w x 40d x 16"h | Painted Aluminum | 60 lbs. |
1 120 volt models end in "00", are UL certified, and require a 15 amp circuit.
240 volt models end in "50", are CE certified, and require a 10 amp circuit
2 Standard 3000 watt elements, 4500 watt element
available. (requires 15 or 20 amp circuit respectively)
NOTE: All units are available with white polyester coated aluminum jackets.
Special Order Only.
1500 watt element standard on all models except 28 gallon model.