Raritan 12-Gallon Hot Water Heater w/Heat Exchanger Review

The Story of My Time with the Raritan 12-Gallon Hot Water Heater w/Heat Exchanger

For years, the quest for reliable, hot water on extended trips has been a constant pursuit. This often meant either the generator chugging away endlessly or accepting lukewarm showers. My previous setup, while functional, always felt like a compromise. The Raritan 12-Gallon Hot Water Heater w/Heat Exchanger emerged as a potential solution, promising consistent hot water without constant power demands.

The decision to upgrade was born from a particularly chilly sailing trip where the prospect of a hot shower after a long day was a distant dream. I recalled seeing the Raritan units in professional installations and their reputation for robustness. Considering its marine heritage and the integrated heat exchanger, this model seemed perfectly suited to my needs. My initial impression upon unboxing was one of solid, no-nonsense engineering. The polymer jacket felt durable, and the overall construction exuded a sense of longevity.

I had briefly considered purely electric models from other brands, but the lure of utilizing engine heat for constant replenishment was too strong to ignore. There was a distinct sense of anticipation, a quiet confidence that this unit would finally resolve a persistent logistical challenge. It wasn’t just about a comfortable shower; it was about enhancing the overall utility and comfort of my vessel.

Real-World Testing: Putting Raritan 12-Gallon Hot Water Heater w/Heat Exchanger to the Test

First Use Experience

My primary testing environment for this water heater was aboard my sailboat, a space where both limited power and available engine time are critical considerations. Installation involved integrating it into the existing plumbing and engine cooling system. The first time the engine ran after installation, I was immediately struck by how quickly the temperature gauge on the heater began to climb.

Performance in varying conditions proved to be a significant advantage. Even with intermittent engine use during shorter voyages, the heat exchanger kept the tank consistently warm, meaning I didn’t have to wait for the electric element to reheat a full tank. This was particularly evident on longer passages where the engine was running for extended periods, providing a virtually inexhaustible supply of hot water.

Ease of use was remarkably high; after the initial plumbing and electrical connections were made, it was largely a set-and-forget operation. The most pleasant surprise was the sheer volume of hot water available. Unlike my previous, smaller unit, this 12-gallon tank, coupled with the engine’s heating capacity, meant multiple people could shower consecutively without a significant drop in temperature. The only minor quirk was ensuring adequate coolant flow from the engine to the heat exchanger for optimal performance.

Extended Use & Reliability

After several months of consistent use, spanning weekend getaways and a longer coastal cruise, the Raritan 12-Gallon Hot Water Heater w/Heat Exchanger has held up exceptionally well. Daily use, including multiple showers and sink usage for washing dishes, has shown no discernible performance degradation. The unit has maintained its ability to heat water efficiently, and the insulation has proven effective at retaining warmth.

Durability has been a standout feature. There are no visible signs of wear and tear, such as cracks, leaks, or stiffness in any components. The polymer jacket, a key design element, has resisted saltwater spray and the general dampness inherent to a marine environment without any corrosion. This is a significant improvement over previous metal-jacketed units I’ve encountered.

Maintenance has been straightforward. The instruction manual suggests checking and replacing the replaceable magnesium anode periodically to protect the tank and neutralize acids in the water. I performed this check after about six months and found it to be a simple, accessible process. Cleaning the exterior is as easy as wiping it down with a damp cloth. Compared to my previous electric-only water heater, the dual-heating capability of this Raritan unit, utilizing both electric and engine heat, offers a much more practical and cost-effective solution for continuous hot water supply.

Breaking Down the Features of Raritan 12-Gallon Hot Water Heater w/Heat Exchanger

Specifications

The Raritan 12-Gallon Hot Water Heater w/Heat Exchanger boasts a 12-gallon capacity, providing ample hot water for galley and shower needs. It operates on 120v power, making it compatible with standard shore power or generator systems. A critical component is the integrated engine heat exchanger, designed with an over seven feet in length of coiled tubing for rapid and efficient heat transfer from the engine’s cooling system.

The tank itself is constructed from glass-lined steel, which the manufacturer claims is more durable than stainless steel, offering excellent corrosion resistance and longevity. This is further protected by a 75 PSI T&P (temperature and pressure) relief valve, a crucial safety feature for any pressurized water system. The cylindrical design of the tank is engineered to withstand greater pressure than cube-shaped tanks, contributing to its robustness.

Furthermore, it features an ignition-protected thermostat, factory set at 120°F but adjustable from 110°F to 160°F. This thermostat also includes a safety shutdown limit of 190°F, ensuring safe operation. The plumbing connections are conveniently located on the same side, simplifying installation; both hot and cold water connections are 3/4″ male NPT, while the heat exchanger connections are 3/4″ female NPT. The unit is encased in an attractive polymer jacket designed to resist corrosion. Finally, a replaceable magnesium anode is included to protect the tank and neutralize acids.

Performance & Functionality

The primary function of the Raritan 12-Gallon Hot Water Heater w/Heat Exchanger is to deliver hot water, and it excels in this regard, especially when leveraging the engine’s heat. The heat exchanger is remarkably efficient; during engine operation, the water heats up noticeably faster than when relying solely on the electric element. This dual-heating capability means that even after significant hot water usage, a short run of the engine quickly replenishes the supply.

A key strength of this water heater is its ability to provide continuous hot water when underway. This is where the integrated heat exchanger truly shines, offering a distinct advantage over electric-only models. The dense foam insulation also performs admirably, keeping water hot for extended periods even when the engine is off or the electric element isn’t engaged. This significantly reduces the need for constant power draw.

However, it’s important to acknowledge its limitations when functioning solely on the 120v electric element, especially from a completely cold start. Heating a full 12 gallons from ambient temperature using only electricity will take a considerable amount of time, as expected for a unit of this size. Users who primarily rely on shore power and have limited generator run-time might find the recovery time to be a point of consideration. Nonetheless, for its intended marine application, where engine run-time is frequent, its performance is exceptional.

Design & Ergonomics

The Raritan 12-Gallon Hot Water Heater w/Heat Exchanger presents a practical and robust design well-suited for demanding environments. The attractive polymer jacket is a significant ergonomic and aesthetic improvement over exposed metal tanks, offering better protection against corrosion and accidental bumps. Its cylindrical design contributes to its structural integrity and allows for efficient internal coil placement for the heat exchanger.

All plumbing connections being on the same side is a thoughtful design choice that greatly simplifies installation, reducing the complexity of routing hoses and pipes in potentially confined spaces common in marine applications. The ignition-protected thermostat is a critical safety feature, particularly important in an environment where flammable vapors could be present. While the thermostat itself isn’t directly interacted with during routine use, its presence speaks to the unit’s safety-conscious design.

The overall feel of the unit is one of solid construction. The materials, particularly the glass-lined steel tank, convey a sense of durability. While not an “ergonomic” product in the traditional sense of being held, its design prioritizes ease of integration and safe, reliable operation within its intended context. There’s no steep learning curve; once installed, it operates largely autonomously, which is precisely what one wants from onboard equipment.

Durability & Maintenance

The Raritan 12-Gallon Hot Water Heater w/Heat Exchanger is engineered for longevity, particularly within the harsh marine environment. The glass-lined steel tank is known for its resistance to corrosion, a critical factor for water heaters exposed to moisture and saltwater. Coupled with the protective polymer jacket, the unit is built to withstand the rigors of the sea. The five-year Limited Warranty on the tank itself further underscores the manufacturer’s confidence in its durability.

Maintenance is relatively minimal, focusing primarily on the replaceable magnesium anode. This is a standard maintenance item for most hot water heaters and is crucial for preventing tank corrosion over time. I found it easily accessible for inspection and replacement. The 75 PSI T&P relief valve is also a component that should be tested periodically to ensure it functions correctly, a simple process of lifting the lever to release a small amount of water.

Based on its construction and the materials used, this unit appears to be designed for a long service life, likely exceeding that of many less robust alternatives. The fact that each unit is assembled by hand and individually tested by Raritan adds a layer of confidence in its overall build quality and reliability. Potential failure points, aside from standard wear on sacrificial anodes or relief valves, are minimal given the straightforward design.

Accessories and Customization Options

The Raritan 12-Gallon Hot Water Heater w/Heat Exchanger comes with its core components integrated, meaning there aren’t many “accessories” in the traditional sense. The key functional additions are the heat exchanger itself, the 75 PSI T&P relief valve, and the replaceable magnesium anode. These are all vital for the unit’s operation and safety.

Customization options are primarily limited to the adjustable thermostat settings. Users can fine-tune the water temperature between 110°F and 160°F, allowing for personal preference and specific use cases. While not an accessory, the fact that all plumbing connections are on the same side significantly simplifies installation, and it’s compatible with standard marine 3/4″ NPT plumbing fittings, making integration into existing systems straightforward.

The lack of extensive accessory options isn’t a drawback here; rather, it highlights the product’s purpose as a complete, self-contained hot water solution. Its design is focused on functionality and reliable performance out of the box, rather than modular add-ons. Raritan’s legendary technical support team is also available, which, while not a physical accessory, is an invaluable resource for any questions or troubleshooting needs.

Pros and Cons of Raritan 12-Gallon Hot Water Heater w/Heat Exchanger

Who Should Buy Raritan 12-Gallon Hot Water Heater w/Heat Exchanger?

This water heater is an ideal choice for boat owners, particularly sailors and powerboat users, who desire consistent hot water without the constant need for generator power. It is perfect for those undertaking extended voyages, live-aboards, or anyone who values the comfort of a hot shower after a day on the water. Individuals who are upgrading older, inefficient systems or replacing a failed unit will find this model a robust and reliable solution.

Those who should probably skip this product are individuals with very limited space, as a 12-gallon tank requires dedicated mounting real estate. It is also less suitable for users who only have access to very limited or infrequent engine run-time and have no access to shore power or a generator; in such niche scenarios, a smaller, more basic electric-only unit might suffice, though with significant compromises on hot water volume.

For optimal performance and ease of use, ensure you have a functioning engine cooling system with adequate coolant flow. A reliable onboard 120v power source (shore power or generator) is also recommended for times when the engine isn’t running, though the heat exchanger significantly mitigates this need. Having a pressurized water system with an appropriate pump is, of course, a prerequisite for any onboard water heater installation.

Conclusion on Raritan 12-Gallon Hot Water Heater w/Heat Exchanger

The Raritan 12-Gallon Hot Water Heater w/Heat Exchanger stands out as an exceptionally well-engineered and durable solution for onboard hot water needs. Its combination of a generous 12-gallon capacity, efficient engine heat exchanger, and robust glass-lined steel tank construction makes it a top-tier choice for marine applications. The thoughtful design, with consolidated plumbing connections and effective insulation, ensures both ease of installation and excellent performance in demanding conditions.

While the initial price point is substantial, the value proposition is strong when considering the unit’s longevity, dual-heating capabilities, and the significant improvement in onboard comfort it provides. The ability to draw hot water from engine heat drastically reduces power consumption, offering long-term savings and greater operational flexibility. For anyone seeking a reliable, high-capacity hot water system that can withstand the marine environment, this Raritan unit is an investment that pays dividends in comfort and convenience. I would enthusiastically recommend this water heater to boat owners looking for a premium, long-lasting solution.