Whale Water Systems Water Heaters

Whale Water Systems Marine Water Heaters: Built for Life on the Water

When it comes to reliable hot water aboard a vessel, few names carry the weight of experience that Whale Water Systems does. Marine water heaters represent one of the most demanding applications in boating — they must perform consistently in damp, salt-laden environments, handle the vibrations of underway travel, and do so safely within tight onboard spaces. Whale has engineered their heaters specifically for these conditions, and it shows in every design choice.

The Seaward Line: Whale's Flagship Marine Water Heaters

Whale's marine water heater lineup is anchored by the Seaward series, which offers a range of tank sizes — from compact 3-gallon units up to 11-gallon or larger models — making it easy to find the right fit whether you're outfitting a small sailboat or a larger powerboat. The Seaward range is available in multiple exterior materials to suit different installation priorities:

• Marine Galvanized Steel — a robust, affordable option for maximum durability
• Stainless Steel — offering the highest level of corrosion resistance with a modern finish
• White Epoxy Coated Aluminum — a lightweight design engineered to blend into cabinetry and tight spaces

One of the most notable engineering choices in the Seaward line is the use of double-wall heat exchangers, which prevent accidental contamination of the freshwater supply. Models are available in both electric-only and combination electric/heat exchanger configurations, allowing boaters to heat water via shore power or passively via the engine's cooling loop while underway — a smart efficiency gain on longer passages.

Safety and Compliance You Can Count On

Whale takes safety seriously on every unit in their water heater range. Key safety features built into the Seaward series include low current switching, an integrated temperature and pressure relief valve, a thermal cut-out, and ignition protection compliant with ABYC E-11 — the industry standard for marine electrical systems. Hold-down brackets are welded directly to the inner tank, ensuring the heater stays securely mounted even in rough conditions.

A Legacy of Marine Engineering

Whale Water Systems traces its roots back to Munster Simms Engineering, established in 1810 and based in Bangor, Northern Ireland. The company has been designing and manufacturing water systems for marine and mobile applications for decades, earning a reputation as a go-to source for complete onboard water management. Today, as part of the Navico Group, Whale continues to innovate across pump and heating technologies. Their water heaters reflect that same philosophy: purpose-built, field-tested, and designed to outlast the conditions most products can't handle.

Whether you're upgrading an aging unit or equipping a new build, Whale Water Systems water heaters deliver the performance, safety, and longevity that serious boaters demand.