Isotemp Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Each unit is built using the highest quality components to ensure superior product performance. Isotemp marine water heaters are very rugged, designed to last for years of trouble-free service. Thanks to the Isotemp reputation for dependability, long life and handsome design, Isotemp marine water heaters add value to every installation.

Unlike common aluminum-core water heaters, the Isotemp marine water heater features brushed stainless steel cover as well as 316-grade acid resistant stainless steel inner tank that is backed by a 5-year limited warranty. Isotemp achieves the highest capacity by optimized positioning of the engine water heat exchanger as well as the electrical immersion heater. They are positioned in the lowest part of the tank where the water is coldest in order to ensure an equal heating of all the water in the tank. The water inlets and outlets are specially designed to minimize the mixture of cold and hot water.

Water is heated to 160+ degrees with just the electric heating element alone. With the engine heat exchanger, water can be heated to 190+ degrees. The innovative thermostat-controlled mixing valve mixes ships water with the hot water to deliver the temperature you want at the faucet. This mixing action speeds recovery time and extends the volume of hot water you get from a smaller tank.

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  1. Rugged design
  2. Water tank is 316-grade stainless steel
  3. External cover is 304-grade stainless steel
  4. Stainless steel mounting brackets encircle the, tank for deck or bulkhead installations.
  5. Thermostat-controlled mixing valve comes standard on all Isotemp water heaters

Products 1-12 of 12
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Isotemp Square 16 (4.2 Gallon Water Heater)
Retail: $813.00
WHI70160
Price: $774.00-$784.00
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Availability: In Stock
Isotherm Item #: WHI70160 -

The Isotemp Slim Square can be installed in three different positions, making it more versatile than standard models. It has a 4.2 gallon capacity, quickly and effectively heats water up via the engine or by the electrical heater element if the boat is connected to shore power.As with all Isotemp water heaters, the Isotemp Slim Square has been constructed with a robust acid proof stainless steel (AISI 316) and fitted with special components to protect it from over-heating. It also features a...

Isotemp Slim 15 (4 Gallon Water Heater)
Retail: $733.00
WHI20150
Price: $690.00-$762.00
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Availability: In Stock
Isotherm Item #: WHI20150 -

Isotemp Slim is a new range of water heaters, available in three sizes, 4, 5.3 and 6.5 gallons. Isotemp Slim has the same exclusive look and design as the Isotemp Basic, with its brushed stainless steel cover. Highest capacity is achieved by the engine water heat exchanger, as well as by the immersion heater mounting. They are positioned as low as possible inside the tank, to heat the water where it is coldest. We give 5 years warranty on the inner tank, for corrosion or material stress. The...

Isotemp Slim 20 (5.3 Gallon Water Heater)
Retail: $747.00
WHI20200
Price: $690.00-$775.00
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Availability: In Stock
Isotherm Item #: WHI20200 -

Isotemp Slim is a new range of water heaters, available in three sizes, 4, 5.3 and 6.5 gallons. Isotemp Slim has the same exclusive look and design as the Isotemp Basic, with its brushed stainless steel cover. Highest capacity is achieved by the engine water heat exchanger, as well as by the immersion heater mounting. They are positioned as low as possible inside the tank, to heat the water where it is coldest. We give 5 years warranty on the inner tank, for corrosion or material stress. The...

Isotemp Slim 25 (6.5 Gallon Water Heater)
Retail: $788.00
WHI20250
Price: $729.00-$818.00
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Availability: In Stock
Isotherm Item #: WHI20250 -

Isotemp Slim is a new range of water heaters, available in three sizes, 4, 5.3 and 6.5 gallons. Isotemp Slim has the same exclusive look and design as the Isotemp Basic, with its brushed stainless steel cover. Highest capacity is achieved by the engine water heat exchanger, as well as by the immersion heater mounting. They are positioned as low as possible inside the tank, to heat the water where it is coldest. We give 5 years warranty on the inner tank, for corrosion or material stress. The...

Isotemp Basic 24 (6.4 Gallon Water Heater) Isotemp Basic 24, Water Heater, 6.4 Gallon
Retail: $778.00
WHI50240
Price: $736.00-$808.00
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Availability: In Stock
Isotherm Item #: WHI50240 -

Isotemp Basic has an exlusive look, with its brushed stainless steel cover, but most important is the internal design. Highest capacity is achieved by the engine water heat exchanger as well as the immersion heater placement. They are positioned in the lowest part of the tank, where the water is coldest, to really heat all the water in the tank, which grants an outstanding volume of hot water. The water in- and outlets are also designed for a minimal mixing of cold water into the hot, by the...

Isotemp Basic 30 (8 Gallon Water Heater) Isotemp Basic 30, Water Heater, 8 Gallon
WHI50300
Price: $721.00-$825.00
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Availability: In Stock
Isotherm Item #: WHI50300 -

Isotemp Basic has an exlusive look, with its brushed stainless steel cover, but most important is the internal design. Highest capacity is achieved by the engine water heat exchanger as well as the immersion heater placement. They are positioned in the lowest part of the tank, where the water is coldest, to really heat all the water in the tank, which grants an outstanding volume of hot water. The water in- and outlets are also designed for a minimal mixing of cold water into the hot, by the...

Isotemp Basic 40 (11 Gallon Water Heater) Isotemp Basic, Water Heater, 11 Gallon
Retail: $870.00
WHI50400
Price: $822.00-$901.00
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Availability: In Stock
Isotherm Item #: WHI50400 -

Isotemp Basic has an exlusive look, with its brushed stainless steel cover, but most important is the internal design. Highest capacity is achieved by the engine water heat exchanger as well as the immersion heater placement. They are positioned in the lowest part of the tank, where the water is coldest, to really heat all the water in the tank, which grants an outstanding volume of hot water. The water in- and outlets are also designed for a minimal mixing of cold water into the hot, by the...

Isotemp Basic 50 (13 Gallon Water Heater)
Retail: $959.00
WHI50500
Price: $869.00-$988.00
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Availability: In Stock
Isotherm Item #: WHI50500 -

Isotemp Basic has an exlusive look, with its brushed stainless steel cover, but most important is the internal design. Highest capacity is achieved by the engine water heat exchanger as well as the immersion heater placement. They are positioned in the lowest part of the tank, where the water is coldest, to really heat all the water in the tank, which grants an outstanding volume of hot water. The water in- and outlets are also designed for a minimal mixing of cold water into the hot, by the...

Isotemp Basic 75 (20 Gallon Water Heater)
Retail: $1,142.00
WHI50750
Price: $989.00-$1,012.00
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Availability: In Stock
Isotherm Item #: WHI50750 -

Isotemp Basic has an exlusive look, with its brushed stainless steel cover, but most important is the internal design. Highest capacity is achieved by the engine water heat exchanger as well as the immersion heater placement. They are positioned in the lowest part of the tank, where the water is coldest, to really heat all the water in the tank, which grants an outstanding volume of hot water. The water in- and outlets are also designed for a minimal mixing of cold water into the hot, by the...

Isotemp Double Coil Basic 40 (11 Gallon Water Heater)
Retail: $993.00
WHI50402
Price: $901.00-$1,025.00
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Availability: In Stock
Isotherm Item #: WHI50402 -

Isotemp Basic has an exlcusive look, with its brushed stainless steel cover, but most important is the internal design. Highest capacity is achieved by the engine water heat exchanger as well as the immersion heater placement. They are positioned in the lowest part of the tank, where the water is coldest, to really heat all the water in the tank, which grants an outstanding volume of hot water. The water in- and outlets are also designed for a minimal mixing of cold water into the hot, by the...

Isotemp Double Coil Basic 75 (20 Gallon Water Heater) isotemp basic 75, water heater, 20 gallon water heater, indel water heater
Retail: $1,458.00
WHI50752
Price: $1,262.00-$1,291.00
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Availability: In Stock
Isotherm Item #: WHI50752 -

Isotemp Basic has an exlusive look, with its brushed stainless steel cover, but most important is the internal design. Highest capacity is achieved by the engine water heat exchanger as well as the immersion heater placement. They are positioned in the lowest part of the tank, where the water is coldest, to really heat all the water in the tank, which grants an outstanding volume of hot water. The water in- and outlets are also designed for a minimal mixing of cold water into the hot, by the...

Water Heater Dual Heating Element 12V 300W Water Heater Dual Heating Element
WHI90001A
Price: $105.00
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(1)
Availability: In Stock
Item #: WHI90001A -

This item has been designed to be a drop-in replacement for the heating element that exists in the Marine hot water tank. It fits into a 1 inch opening and offers two separate  heating elements. One is designed to connect to the standard 120 V AC power source and produces 500 W of heat, and the second is designed to connect to the 12V system and produce 300 W of heat.The 12V element provides an excellent load source for diversion load controller's that are used in conjunction with...