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.