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Products Electric Low Capacity Shipboard Electric Water Heater

High Capacity Shipboard Electric Water Heater

Hubbell Seafare MSE

6-119 Gallon Capacity
Up to 58 KW
Single or Three Phase

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model mse


The Hubbell Model MSE water heater is specifically designed for marine use and is in conformance with USCG and is ABS Type Approved. By utilizing deck and removable bulkhead mounting supports, the water heater is securely fastened to the ship structure, thus providing a secure and reliable water heater installation. To ensure tank longevity, the high quality tank is constructed of steel and internally lined with specially formulated hydrastone cement. The Hydrastone Cement lining, along with solid copper-silicon threaded tank openings and a built-in heat trap device, all ensure a longer lasting, energy efficient water heater that is resistant to the highly corrosive effects of hot water.

When you specify and install a Hubbell model MSE, knowing that it is in conformance with USCG regulations and ABS Type Approved, you will have confidence that the ship owner will be provided with a long lasting, trouble-free source for hot water.

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Heavy Duty Construction

  • Hydrastone cement lining provides longer tank life
  • Copper-silicon alloy tappings cannot rust or corrode
  • High impact composite jacket cannot rust or corrode and eliminates damage during installation and transit

Marine Approved

  • United States Coast Guard (USCG) conformance and American Bureau of Shipping (ABS) Type Approved
  • USCG conformance and ABS Type Approval eliminates costly delays and uncertainties during ship inspection

Wide Selection

  • Built to meet your exact needs
  • Numerous options available for specialized applications

Mounting System

  • Heavy duty legs secure the tank to deck
  • Removable side-sway bulkhead attachment points provide added mounting integrity
  • The entire mounting system is integrally welded to tank for maximum stability and safety

High Efficiency

  • 2" thick polyurethane foam insulation reduces heat loss
  • Built-in heat trap lowers operating costs


  • Full five (5) year Non Pro-rated tank warranty is standard
  • Full ten (10) year Non Pro-rated tank warranty can be specified for extended protection


TankHydrastone Cement Lined Steel
Capacities6 thru 119 Gallons
Voltages120 thru 600 Volt
Phase1 or 3 φ
Inlet Size:
Below 45 KW: 3/4" Female NPT
45 KW and over: 1 1/2" Male NPT
Outlet Size:
Below 45 KW: 3/4" Male NPT
45 KW and over: 1 1/2" Male NPT
Drain Size3/4" GHT Hose Connection
Relief Valve Size3/4" Female NPT
Relief Valve TypeT&P;, 210°F, 100 psi
Thermostat Range:
Surface: 110-170°F
Immersion: 100-190°F
Design WP100 psi
Design TP300 psi
ElementsIncoloy Sheathed
Insulation2" Polyurethane Foam
Tank Warranty:
Standard: 5 Year Non Pro-Rated
Optional: 10 Year Non Pro-Rated
Electrical Warranty1 Year
JacketHigh Impact Colorized Composite
FinishWhite with Black
Marine ClassificationsABS Type Approved

General Specifications

  • 1/2" thick Hydrastone cement lining
  • Removable bulkhead attachment points
  • Heavy-duty integrally welded leg supports for deck mounting
  • Non-ferrous solid copper-silicon threaded openings for maximum corrosion resistance
  • Magnetic contactor(s) are heavy duty resistive load type rated for 200,000 cycles
  • Low voltage control circuit (fused) transformer (units over 240 volt)
  • Power circuit fuse protection (units over 48 amp)
  • Incoloy sheathed immersion heating elements
  • Built-in heat trap to improve operating efficiency (3/4" only)
  • Surface thermostat 110-170°F range
  • Immersion thermostat (100-190°F) furnished as standard when required due to high recovery versus storage ratio.
    On 6-30 gallon heaters over 5 KW
    On 40 and 50 gallon heaters over 8 KW
    On 65 gallon heaters over 12 KW
    On 80-119 gallon heaters over 15 KW
  • Surface safety hi-limit cut out with manual reset button (190°F)
  • Immersion safety hi-limit cut out with manual reset button (Standard on heaters 45 KW and above)
  • ASME rated temperature and pressure relief valve set at 100 psi, 210°F
  • 2" thick polyurethane foam insulation
  • High impact non-corroding colorized composite protective jacket
  • Cold water inlet diffuser with drain valve


model mse drawing

Model MSE Dimensional Data

model mse drawing

Formulas & Charts


GPH x _____________ °F ΔT x 0.00244 = KW
KW x 410 ÷ GPH = ____________ °F ΔT
KW x 410 ÷ __________ °F ΔT = GPH
Note: 1 KW will heat 4.1 GPH at a 100°F ΔT


((KW x 1000) ÷ Volts) ÷ 1.73 = Amps 3 Φ
(KW x 1000) ÷ Volts = Amps 1 Φ

model mse formula table


  1. The KW selections above are shown for convenience. A full selection of KW ratings from 1 to 58 KW is available by simply entering the desired KW into the model number.
  2. Units 45 KW and over are supplied with 1 1/2" Male NPT inlet/outlet connections and immersion hi-limit.
  3. Alternate voltages including 220, 230, 460, 575 and 600 volt are available. Please contact us directly.


Optional Equipment

  • Full 10 Year Non Pro-Rated tank warranty
  • Control circuit (fused) transformer. (Standard on units over 240V)
  • Electronic low water cut off
  • Power circuit fuse protection
  • Immersion thermostat (specify 100-190°F or 30-110°F Range)
  • Immersion adjustable (100-240°F) safety hi-limit cut out with manual reset
  • Solid Type 316L stainless steel tank, 90/10 copper nickel alloy tank
  • 1 1/2" Male NPT brass inlet and outlet water connections (heat trap not available)
  • 2" Male NPT brass inlet and outlet water connections (heat trap not available)
  • Special connection size/type
  • Combination temperature and pressure gauge: 2 1/2" dial, 30-240°F, 0-200 psi - factory installed in tank
  • Built-in circuit breaker, specify with or without shunt trip protection
  • Built-in non-fused On/Off disconnect switch
  • Electro-mechanical 7-day time clock wtih battery back-up
  • Horizontal construction
  • NEMA 4 weather resistant construction for installation in outdoor/wet areas
  • Explosion resistant enclosures for hazardous locations
  • Secondary heating capability provided by a tank inserted heat exchanger constructed from single wall (Optional: double wall) copper fin tube
  • Additional ground connections
  • Alternate working pressure available

Please note: optional equipment may impact overall dimensions and weight. Please request submittal drawing from factory.



How does the heat trap work?

The Hubbell water heater is constructed with a heat trap installed within the water heater’s hot water outlet connection. This device helps prevent heat from escaping through the storage tank’s hot water outlet during standby periods, resulting in improved operating efficiency. The heat trap is constructed from a specially designed bronze nipple with an internal floating ball that during standby periods of no flow settles and closes off the storage tank thereby preventing thermal conduction of hot water radiating through the hot water outlet.

What temperature should I set my water heater?

For typical domestic potable hot water service the temperature of your water heater at 125°F is sufficient. This prevents wasted energy (which means cost savings for you) and also decreases the possibility of scalding water burns. If you run out of hot water on this setting, increase the temperature by five degrees incrementally until your hot water needs are met. The goal is to have the temperature set just high enough to meet your needs but within safe operating parameters. Please note that a water heater in and of itself should not be relied upon as the ultimate temperature controlling source for the hot water delivered to your fixtures. Please consult local and state codes for installation of the proper and code approved (ASSE 1016, 1070, 1017) mixing devices to achieve the safe delivery of hot water to the fixtures. For a more complete information please download the whitepaper PDF titled "Understanding Potential Water Heater Scald Hazards" developed by ASSE at the following link ASSE Whitepaper

Do I need to install an insulation blanket?

No. Most new electric water heaters are highly efficient with respect to the amount of heat loss radiating from the storage tank. This is due to the use of “blown in” polyurethane foam insulation as the insulating method for modern tanks, compared to the fiberglass blanket style insulation used by water heater manufacturer’s largely in the past. As such there is little to no benefit, and very possibly a detrimental effect to efficiency, installing an insulation blanket on a new electric water heater constructed with foam insulation.

What is the average life of an electric water heater?

The most important factor related to the life expectancy of a water heater is the quality and type of storage tank. On an average the life expectancy of a glass lined electric water heater is about 10-12 years (according to the National Association of Home Builders 2007 Study of Life Expectancy of Home Components ), compared to a cement lined electric water heater’s average life expectancy of 23-26 years (Independent study of over 25,000 installations for an Electric Utility). Of course, there are various other factors that affect longevity including pressure fluctuations, usage, water conditions, environmental conditions, etc.

Is it OK to use softened water with my cement lined tank?

Yes it is OK. A water softener system will not affect the longevity or operation of a Hubbell cement lined water heater tank. A water softener is typically installed when a potable water system has hard water resulting in the need to soften the water. Unfortunately, the salt used in a water softener corrodes the anode rod and exposed steel surfaces of the water heater tank, rapidly causing a glass lined water heater to corrode and leak within a few years. This is an issue for a glass lined water heater due to its reliance on a sacrificial anode, however because a cement lined tank does not use a sacrificial anode softened water is of no concern to the Hubbell cement lined tank.

What is a sacrificial anode and does a cement lined tank need one?

All water heaters constructed using a steel tank requires a lining to protect the internal steel surfaces from corrosion. Certain linings (i.e. glass and epoxy), due to their nature, have unavoidable holes and imperfections resulting in exposure of the steel tank. As a result of this deficiency, the manufacturer will install an anode rod(s) in an attempt to delay corrosion of the steel tank. An anode rod is typically made of aluminum, magnesium or zinc, is a maintenance item that requires periodic inspection and replacement, and is often times the cause of a “rotten egg” odor to your hot water. Often referred to as a sacrificial anode rod because, over time, it slowly dissolves, sacrificing itself as it is attacked by aggressive substances in the water which would otherwise attack the steel tank through the pinholes and imperfections of the glass or epoxy lining. A cement lined steel tank on the other hand does not require an anode because of the thickness and guaranteed 100% coverage of the cement lining over all internal surfaces of the steel tank. This eliminates the need for an anode rod in a cement lined water heater, resulting in a significantly longer life compared to a glass or epoxy lined water heater. For a further discussion please click on the following link Cement Lining

What is the max water temperature setting?

The Hubbell cement lined tank is suitable for storing water up to 194°F. However, it should be noted that your water heater will likely require optional control accessories to achieve this temperature, but there is no concern regarding the ability of the lining to withstand this temperature. Additionally, there are numerous safety concerns that must be considered when storing water at elevated temperature, please consult factory.

What is the difference between surface and immersion thermostats?

A surface thermostat is a bi metallic sensing temperature regulating thermostat that senses the outer wall temperature of the water heater tank. An immersion thermostat is a bulb and capillary style temperature regulating thermostat that senses the water temperature through a dry immersion well in the water. A surface thermostat is adjustable up to a maximum of 170oF and an immersion thermostat adjusts up to a maximum of 194oF. A surface thermostat is typically used in low wattage water heaters, whereas an immersion thermostat is used in high wattage water heaters.

Which is better for me, a tankless or storage type water heater?

It depends. A tankless water heater is sometimes referred to as a Point-of-Use (POU) or instantaneous water heater. Due to the relative small physical size of a tankless water heater compared to a storage tank water heater, a tankless option can be advantageous from a space saving perspective and can sometimes be installed closer to where you want hot water (hence the term POU). However, tankless heaters are not suited for many applications, so it is critical that before choosing to go tankless you have carefully considered all of the factors that sometimes make the tankless option more complicated and risky compared to a storage type water heater. In particular, you should understand the operational characteristics, maintenance requirements, reparability, and sometimes significant installation requirements of a tankless water heater before making a decision. Tankless units do not store heated water like a storage type water heater; they only heat water as there is demand and therefore must be sized to meet the maximum flow for the application. In some cases a tankless water heater may improve operating efficiency, but possibly at the expense of user comfort. Hubbell tankless water heaters are available inElectric Tankless or Gas Tankless.

What is the water pressure drop through the tank?

There is no major restriction of water flow through the Hubbell water heater. Cold water inlet and hot water outlet sizes are available in ¾” and 1-1/2” sizes to accommodate your application. By far, the ¾” size is more than adequate for most applications using a model E water heater. If your flow rate through the water heater is greater than approximately 10 GPM you may want to consider the 1-1/2” connection option (must be specified at time of ordering). As an approximate, pressure drop through any E model water heater with ¾” connections will be <4 psi with a flow rate of <10 GPM, and with 1-1/2” connections the pressure drop will be <3 psi with a flow rate of <20 GPM.

Is there a cold water dip tube in the Hubbell tank?

Not exactly. The Hubbell cement lined tank includes a cold water diffuser integrated into the cold water connection which allows incoming cold water to be introduced into the tank in a controlled and non turbulent manner, thus avoiding premature mixing of cold water with the hot water in the tank. On Hubbell cement lined tanks the cold water inlet/diffuser is located on the side in the lower portion of the tank. Therefore, a Hubbell cement lined tank does not require a long dip tube extending all the way from the top to the bottom of the tank as is common in glass lined tanks.

How does my water heater ship?

All Hubbell storage type water heaters ship via common carrier and are classified by the Commodity Classification Standards Board under National Motor Freight Classification (NMFC) class 100. Each water heater is palletized and wood crated. All Hubbell tankless water heaters, when transported using common carrier, ship class 77.5. To provide the lowest transportation cost, in most cases the shipment is made on Hubbell’s account and the freight cost is added to the invoice, commonly referred to as “Pre pay and add”. For very large shipments, the most economical method (LTL or Dedicated Truck) for transporting the water heaters to the final destination will be analyzed by Hubbell's transportation department.

Why is Hydrastone Cement a better choice over glass lining?

Cement lining provides guaranteed 100% coverage with a minimum thickness of 0.5” over all internal tank surfaces. In comparison, glass lining is approximately 0.005” thick and includes imperfections, pinholes and variation in coverage thickness resulting in portions of unprotected steel tank exposed to corrosion. In an attempt to compensate, glass lined tanks include a sacrificial anode in an effort to slow down the corrosion of the tank. Cement lined tanks on the other hand do not require an anode due to the integrity of the lining. As such, a cement lined tank will far outlast a glass lined tank. For a more complete explanation of the benefits of the Hubbell cement lining please click on the following link Cement Lining

What does 3 phase Open Delta wiring mean to me?

Without getting into a lengthy discourse on electricity, the simple answer is that any water heater internally wired in a 3 phase open delta configuration is unbalanced, meaning that the amperage drawn by one of the three legs is high and unequal to the other two legs. This unbalanced water heater can have a detrimental effect on a buildings power system and therefore needs to be carefully understood before you install a water heater configured for 3 phase open delta. It should be noted that the branch circuit protection (i.e. circuit breaker) servicing a 3 phase open delta water heater needs to be sized for the high amperage leg. The Hubbell model E is available up to a maximum of 12kw in 3 phase open delta wiring. Alternatively, the Hubbell model SE is a balanced 3 phase water heater, meaning that all three legs draw equal amperage. The Model SE is available up to 58kw click here details Model SE

Why is a cement lined tank a better choice than stainless steel tank?

In almost all cases, a cement lined steel tank is a more robust tank compared to stainless steel. The weakness of a stainless steel tank is in the materials susceptibility to SCC (Stress Corrosion Cracking) caused by chlorides, bromides, iodides and fluorides in the water. The combination of residual stresses from welding, roll forming and stamping, and the cyclic stress from operating in a hot water system are sources of tensile stress, that when above a certain threshold stress, will make a stainless steel water heater tank susceptible to stress corrosion cracking. Cement lined steel tanks are not susceptible to this condition, and therefore are more resistant to corrosion and withstand the pressure and temperature cyclical operation of a water heater.

Can I get my water heater made for horizontal installation?

Yes. Please consult with your Hubbell Sales Engineer.

Is Tankless right for my application?

It depends. Due to the relative small physical size of a tankless water heater compared to a storage tank water heater, a tankless option can be advantageous from a space and weight saving perspective and can sometimes be installed closer to where you want hot water. Tankless water heaters do not store heated water like a storage type water heater; they only heat water as there is demand and therefore must be sized to meet the maximum flow and temperature rise for the application. Therefore, before proceeding with a tankless heater you must carefully understand your application and review your available power. Hubbell offers a wide range of electric tankless marine heaters go to Electric Tankless for details. It is critical that before choosing to go tankless you have carefully considered all of the factors that sometimes make the tankless option more complicated and risky compared to a storage type water heater.

When should I specify an immersion thermostat?

An immersion thermostat should be specified when the desired operating temperature either is below 110F or above 170F, or the water heater is to be used in an unusual application that is outside of the normal operating parameters of a typical domestic water heater. Otherwise, the type of thermostat (surface or immersion) is determined by Hubbell as is appropriate for the kw and storage tank size of the water heater.

Why would I want a copper alloy tank for my application?

If your marine application demands the longest life and most reliable operation, then you should consider a solid copper alloy tank for your water heater. This type of tank is constructed from 90/10 copper nickel (or copper silicon 655) alloy for maximum longevity. This copper alloy is highly corrosion resistant even at elevated water temperature and has the most desirable characteristics for use as a water heater tank. This construction is intended to last the life of your ship, and as a result is likely to have the lowest total cost of ownership over th life of the ship when one considers the tremendous cost for removing and replacing a lined steel water heater. Ship owners know all too well the real cost involved of cutting out and replacing equipment. Therefore, the owner motivated to provide the lowest total cost of ownership water heater will benefit when the onboard water heater is specified as copper alloy.

What is the maximum allowable working pressure (psi)?

Hubbell marine shipboard water heaters are designed for a maximum allowable working pressure of 100psi and are supplied with a combination temperature and pressure safety relief valve set at 100ps and 210°F. Please consult with a Hubbell Sales Engineer if you require a higher working pressure rating.

Is a glass lined tank recommended for marine use?

Not in a commercial marine environment. The real cost of a water heater in a marine environment, especially commercial marine, is the cost of replacement. Therefore, it makes economic sense to install a water heater with a long life expectancy. Hence, glass lined water heaters are not the best choice in a marine environment when a cement lined water heater can typically provide 3 times longer life in comparison.

Is 277 volt 3 phase voltage available for a water heater?

For all water heaters 277V is only an available option in 1PH, not 3PH. The 277V 1PH voltage is a derivation of your existing 480V 3Ph power. Where 480V is the line to line voltage on a 3 phase system and 277V is the voltage from any one of these lines to neutral, thus making the 277V power available in 1PH only.

What is the R value of a Hubbell water heater?

Hubbell uses a blown-in polyurethane foam insulation for all cement lined water heaters and tanks up to 150 gallon capacity. This insulation has an R value of 7.2 per inch. Most Hubbell tanks have a minimum of 2 inches of insulation resulting in an R value of 14. Certain models are available either standard or as an option with 3 inch insulation and therefore have an R value of 21. Large storage water heater tanks over 150 gallon capacity and custom made stainless steel or alloy tanks have either 2" or 3" fiberglass insulation with an R value of 3.5 per inch.

Does Hubbell offer DNV certification?

Yes. Hubbell marine water heaters come standard with ABS Type Approval, but and are also available on request with other third party approvals including DNV, BV or NR-13.

Why Hubbell recommends 300 series versus duplex stainless steel?

While it is true that duplex stainless steel typically offers higher strength and resistance to Stress Corrosion Cracking (SCC) and chloride corrosion compared to austenitic (300 series) stainless steel, there are other factors that ultimately make it a less desirable choice compared to 300 series stainless steel. Duplex stainless steel makes up only 1% of the stainless steel market making it less readily available and higher cost especially in flanges, fittings and formed parts such as tank heads. While it is commonly stated that this added expense is offset by the ability to use material that is thinner due to the higher strength, this only applies to very large tanks where a reduction results in using a lower common plate thickness. As an example, a thickness reduction of 25% for a tank that is 3/16" thick in 300 series stainless steel still results in using the common 3/16" thick plate size in duplex stainless steel. The higher strength of duplex also has the negative result of decreased formability and machinability, adding cost to the fabrication and production process. In terms of welding, duplex stainless steel presents many problems in maintaining the proper two phase mixture which commonly leads to issues in the Heat Affected Zone (HAZ) such as loss of corrosion resistance, toughness, and post-weld cracking. This is true in all duplex stainless steel welding processes including TIG, MIG and Laser. By comparison the process of welding austenitic stainless steel is much more forgiving. The main weakness of austenitic stainless steel is its susceptibility to Stress Corrosion Cracking (SCC) and chloride corrosion. Three factors that all must all be present cause this type of corrosion: elevated heat, the presence of chlorides, and residual stresses. In water heaters elevated heat and the presence of chlorides cannot be controlled. However, post-weld heat treating in a vacuum furnace followed by cooling in an inert atmosphere relieves the residual stresses in austenitic stainless steel tanks and therefore eliminates the susceptibility to this corrosion. For this reason, this post-weld heat procedure is performed on all Hubbell stainless steel tanks. The heat treating process is highly controlled and verifiable, unlike the difficult to control process of welding duplex stainless steel. Therefore, Hubbell offers stainless steel tanks fabricated from the 300 series (typically Type 304L or 316L) only, as this is a far more proven and verifiable material and fabrication process which will result in longer tank life. Of course, an alternative option is to specify the Hubbell cement lined steel tank which also provides a considerably longer life and is a more economical solution compared to duplex stainless steel and 300 series stainless steel.

Do Hubbell water heaters qualify as Low Lead?

Yes, all Hubbell water heater models qualify as meeting the low lead requirements of the “Reduction of Lead in Drinking Water Act” amendment to the “Safe Drinking Water Act” (SDWA) Section 1417(d) effective as of January 4, 2014. Hubbell certifies that its water heaters meet the following requirements of the SDWA and therefore are qualified and certified as Low Lead : (a)Hubbell water heater do not contain more than 0.2 percent lead with respect to solder and flux (b)Hubbell water heaters do not contain more than a weighted average of 0.25 percent lead with respect to all wetted surfaces of the water heater

Can my cement lined tank be damaged during installation and handling?

Although we don’t advocate dropping our tanks sometimes stuff happens. The Hubbell Hydrastone cement lining is a minimum of 1/2"thick (100 times thicker than a glass lined tank) and is guaranteed to uniformly cover 100% of all internal tank surfaces. Basically the Hubbell cement lining is a tank within a tank and should have no problem withstanding the rigors of shipping and installation. Although not necessry, you can specify an optional hand hole on our smaller tanks (150 gallon and under) to provide a means for inspection and repair. Water heaters with tanks larger than 36" generally include a 12" x 16" manway. In both cases, a Hubbell tank properly maintained will last decades.

What is the difference between solid-state and electromechanical relays?

Depending on the application, one switch may be more advantageous than the other. Please refer to this article to read more about the differences between solid-state and electromechanical relays.

How do I prepare my water heater for long term storage?

The water heater must be stored in the orientation of intended use (vertical, horizontal). The recommended ambient air temperature range is between 50 and 105 degree F and not exceeding 65% Rh. Under no conditions should the unit be subject to freezing temperatures. The unit is intended to be stored indoors, protected from the elements. Desiccant material should be inserted into the electric control panel and heating element terminal house (if applicable). Prolonged storage will require periodic inspection of desiccant. For cement lined tanks only, place approximately 10 gallons of water in the tank before closing and sealing all openings to ensure a humid atmosphere for the lining is maintained. Cap and seal all openings and tank tappings and/or flanges. Provide the necessary protection to ensure the tank and all accessories are protected from physical contact that could result in damage. Shrink wrapping or other suitable protective plastic may be applied to the exterior. Start up and installation guidelines must be followed, with particular attention to testing of the electric heating element.

When is ASME code required?

Engineers and designers should consider all local codes when specifying approval requirements. For an in depth explanation, reference the National Board of Boiler and Pressure Vessel Inspectors Guide In general, water heater pressure vessels require ASME if the heat input exceeds 200,000 Btu/Hr (58.6kW) or if the storage capacity exceeds 120 gallons. Many water heater manufacturers choose to label and rate their tank 119 gallon to avoid any confusion. However, a tank rated at 120 gallons does not require ASME as code is only required for tanks that exceed 120.

What sheath material is best suited for heating potable water?

There are two materials that are commonly accepted as appropriate for use as heating elemenents in potable water, copper and incoloy 800. The advantage of copper is that it has better heat transfer characteristics, and it is lower cost. So with the copper element, more heat energy can be output by a given design (higher watt density) without over heating the element, as it transfer more efficiently to the water, keeping the sheath temp low at even higher watt densities. In comparison, incoloy 800 has a significantly higher melting point and oxidation temp. It is also generally more corrosion resistant. The practical benefit of of using incoloy in potable water beyond corrosion resistance, is that because of the material's ability to withstand higher temperatures, when scaling occurs and insulates the elements, copper may melt or break down (fail), whereas incoloy can actually dry out the scale, causing it to crack and fall off the element. So you will still get scale buildup, but as it insulates the elements the incoloy is likely to last much longer.

Is American Bureau of Shipping (ABS) approval needed?

Equipment and specifically water heaters for use in commercial marine applications require special construction features to ensure longevity and proper operation in a marine environment. In addition, the water heater must be constructed in conformance to the Code of Federal Regulations USCG 46 CFR Part 53.01 and the pressure vessel must be designed and constructed to the proper ASME code and stamped. A Hubbell marine water heater is manufactured under a Certificate of Manufacturing Assessment as issued by American Bureau of Shipping (ABS) Here

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