Whale Seaward 6 Gallon Hot Water Heater – Stainless Steel – 240 V (Model S750E)

The Whale Seaward 6 Gallon Hot Water Heater – Stainless Steel – 240 V (S750E) is a marine-grade electric water heater engineered to deliver dependable hot water performance for boats, RVs, and coastal vessels. Designed specifically to withstand harsh marine environments, this 240 volt unit provides efficient and continuous hot water for showers, sinks, and galley use aboard your craft. 

Constructed with a durable stainless steel exterior, the S750E resists corrosion while offering a modern, attractive finish that’s lighter than galvanized models yet robust enough for long-term use. Its 6 gallon (23 L) capacity strikes the ideal balance between space-saving design and sufficient hot water supply for small to medium-sized vessels. 

Built for safety and performance, this Seaward heater includes integrated safety controls, a pressure relief valve, and a temperature/pressure drain tube for simplified maintenance. Double-wall heat exchange construction ensures efficient heat retention and consistent delivery, while welded hold-down brackets make secure installation easier.

Key Features:

• 6 gallon / 23 L capacity — ideal for boats, yachts, and RVs

• 240 V electric operation for efficient, continuous hot water

• Stainless steel exterior: high corrosion resistance and modern look

• Double-wall heat exchanger for durability and efficient heating

• Integrated safety controls and pressure relief valve included

• Temperature and pressure drain tube for maintenance

• Horizontal mounting design for versatile installation 

Applications:

• Marine fresh water systems

• Boat shower and galley hot water supply

• RV and camper hot water systems

• Replacement or upgrade for existing water heaters

The Whale Seaward 6 Gallon Hot Water Heater (S750E) offers reliable, corrosion-resistant performance and trusted marine quality to keep your onboard hot water flowing when you need it most. 

Maintenance Pro-Tip:

To maximize the lifespan of your aluminum tank, Whale strongly recommends the use of a Magnesium Anode (sold separately). The anode rod acts as a "sacrificial" metal that prevents galvanic corrosion from eating through the tank walls. Check your anode annually and replace it once it has been consumed by 50% or more.