Whale Seaward 11 Gallon Hot Water Heater w/Front Heat Exchanger – Stainless Steel – 240V – F1250

The Whale Seaward 11 Gallon Hot Water Heater w/ Front Heat Exchanger – Stainless Steel – 240 V (Model F1250) is a marine‑grade electric water heating solution engineered for boats, yachts, and RV applications where reliable and efficient hot water supply is essential. Designed specifically for harsh marine environments, this heater features a stainless steel exterior that offers excellent corrosion resistance and durability while providing a clean, modern finish. 

Built to horizontal mounting specifications, the F1250 includes an integrated front heat exchanger that enables you to pre‑heat water using engine heat—reducing shore power use and improving overall energy efficiency while underway. The heater also includes double wall heat exchangers, integrated safety controls, a pressure relief valve, and a temperature/pressure drain tube for efficient maintenance and safe operation. 

With its 11 gallon (42 L) capacity and rugged build quality, this Whale Seaward unit delivers consistent hot water for onboard showers, sinks, and galleys, making it an ideal choice for cruising, liveaboard, or vacation vessel installations.

Efficient Dual-Heating Technology

The F1250 allows you to enjoy hot water whether you are at the dock or crossing an ocean:

• Electric Mode: When connected to shore power or a generator, the 1500W element provides rapid recovery for hot showers.

• Engine Heat Exchanger: The front-mounted heat exchanger utilizes the engine's closed-loop cooling system to heat your water for free while the vessel is in motion.

Key Features

• All-Stainless Exterior: Encased in a polished 304 stainless steel jacket, providing a professional "yacht-grade" appearance and maximum resistance to the humid, salty environment of an engine compartment.

• Robust Aluminum Tank: The interior tank is constructed from high-quality aluminum, protected by a replaceable magnesium anode to prevent galvanic corrosion.

• Horizontal Orientation: Designed for a horizontal footprint, making it easier to tuck into lockers, under berths, or along engine room bulkheads where vertical clearance is limited.

• Ignition Protected: Safe for installation in gasoline engine compartments (meets ABYC and USCG standards).

• Safety Integrated: Factory-installed T&P (Temperature and Pressure) relief valve ensures the unit operates within safe limits at all times.

Technical Specifications

Why Choose the F1250?

The 11-gallon capacity is the industry standard for boats in the 30–45 foot range, providing enough hot water for two comfortable showers back-to-back. Choosing the stainless steel model over the galvanized version is a smart long-term investment; it resists "tea-staining" and structural rust, ensuring the unit remains looking and performing like new for years.

Installation Pro-Tip:

When mounting the F1250, ensure the magnesium anode (located behind the access panel) remains accessible. You should inspect this rod at least once a year. If the anode has been consumed by more than 50%, replace it immediately to ensure the longevity of your aluminum tank. Also, always fill the tank with water before turning on the 240V power to avoid "dry-firing" and destroying the heating element.