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 1-16 of 16
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Isotemp Basic Stainless Steel 24
Price: $921.00-$934.00
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Availability: Back Order

The Isotemp BASIC line of Stainless Steel Marine Water Heaters comes with brushed stainless steel cover as well as innovative internal design. It achieves highest capacity by optimized installation of the engine water heat exchanger as well as the immersion heater. The Basic line is characterized by a larger diameter (16 inches) and shorter length. Isotemp Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp features a brushed...

Isotemp Basic Stainless Steel 30
Price: $923.00-$946.00
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Availability: Back Order

The Isotemp BASIC line of Stainless Steel Marine Water Heaters comes with brushed stainless steel cover as well as innovative internal design. It achieves highest capacity by optimized installation of the engine water heat exchanger as well as the immersion heater. The Basic line is characterized by a larger diameter (16 inches) and shorter length. Isotemp Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp features a brushed...

Isotemp Basic Stainless Steel 40
Price: $995.00-$1,012.00
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Availability: Back Order
Isotherm

The Isotemp BASIC line of Stainless Steel Marine Water Heaters comes with brushed stainless steel cover as well as innovative internal design. It achieves highest capacity by optimized installation of the engine water heat exchanger as well as the immersion heater. The Basic line is characterized by a larger diameter (16 inches) and shorter length. Isotemp Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp features a brushed...

Isotemp Basic Stainless Steel 40 TCT
Price: $1,088.00-$1,112.00
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Availability: Back Order

The Isotemp BASIC line of Stainless Steel Marine Water Heaters comes with brushed stainless steel cover as well as innovative internal design. It achieves highest capacity by optimized installation of the engine water heat exchanger as well as the immersion heater. The Basic line is characterized by a larger diameter (16 inches) and shorter length. Isotemp Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp features a brushed...

Isotemp Basic Stainless Steel 50
Price: $1,053.00-$1,090.00
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Availability: Back Order

The Isotemp BASIC line of Stainless Steel Marine Water Heaters comes with brushed stainless steel cover as well as innovative internal design. It achieves highest capacity by optimized installation of the engine water heat exchanger as well as the immersion heater. The Basic line is characterized by a larger diameter (16 inches) and shorter length. Isotemp Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp features a brushed...

Isotemp Basic Stainless Steel 75
Price: $1,135.00-$1,168.00
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Availability: Back Order

The Isotemp BASIC line of Stainless Steel Marine Water Heaters comes with brushed stainless steel cover as well as innovative internal design. It achieves highest capacity by optimized installation of the engine water heat exchanger as well as the immersion heater. The Basic line is characterized by a larger diameter (16 inches) and shorter length. Isotemp Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp features a brushed...

Isotemp Basic Stainless Steel 75 TCT
Price: $1,285.00-$1,324.00
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Availability: Back Order

The Isotemp BASIC line of Stainless Steel Marine Water Heaters comes with brushed stainless steel cover as well as innovative internal design. It achieves highest capacity by optimized installation of the engine water heat exchanger as well as the immersion heater. The Basic line is characterized by a larger diameter (16 inches) and shorter length. Isotemp Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp features a brushed...

Isotemp Slim 15 Stainless Steel -  4 gallon - 115V/230V
Price: $803.00-$818.00
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Availability: Back Order
Isotherm

Isotemp SLIM Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp SLIM features a brushed stainless steel cover and a 316-grade stainless steel inner tank that is backed by a 5-year limited warranty against leakage due to corrosion or manufacturing defect. Isotemp Stainless Steel Water Heaters achieve the highest capacity by optimizing the position of the engine water heat exchanger as well as the electrical immersion heater. These...

Isotemp Slim 20 Stainless Steel -  5.3 gallon - 115V/230V - USA/ Euro Plug
Price: $812.00-$834.00
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Availability: Back Order

Isotemp SLIM Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp SLIM features a brushed stainless steel cover and a 316-grade stainless steel inner tank that is backed by a 5-year limited warranty against leakage due to corrosion or manufacturing defect. Isotemp Stainless Steel Water Heaters achieve the highest capacity by optimizing the position of the engine water heat exchanger as well as the electrical immersion heater. These...

Isotemp Slim 25 Stainless Steel -  6.5 gallon - 115V/230V - USA/ Euro Plug
Price: $890.00-$913.00
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Availability: Back Order
Isotherm

Isotemp SLIM Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp SLIM features a brushed stainless steel cover and a 316-grade stainless steel inner tank that is backed by a 5-year limited warranty against leakage due to corrosion or manufacturing defect. Isotemp Stainless Steel Water Heaters achieve the highest capacity by optimizing the position of the engine water heat exchanger as well as the electrical immersion heater. These...

Isotemp SPA 15 (4 Gallon Water Heater)
Price: $617.00-$647.00
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Availability: Back Order

All Isotemp tanks come standard with the innovative Isotemp Temperature Control Safety Mixing Valve which protects users from scalding hot water. Water heated with engine heat exchangers can be heated to 190 degrees or more which can scald those unfamiliar with boat water heaters. Water will also be heated to 160+ degrees with just the electric heating element alone. By adjusting the valve, the Isotemp thermostat-controlled mixing valve mixes the boat’s water with the hot water to deliver the...

Isotemp SPA 20 (5.3 Gallon Water Heater)
Price: $649.00-$681.00
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Availability: Back Order

All Isotemp tanks come standard with the innovative Isotemp Temperature Control Safety Mixing Valve which protects users from scalding hot water. Water heated with engine heat exchangers can be heated to 190 degrees or more which can scald those unfamiliar with boat water heaters. Water will also be heated to 160+ degrees with just the electric heating element alone. By adjusting the valve, the Isotemp thermostat-controlled mixing valve mixes the boat’s water with the hot water to deliver the...

Isotemp SPA 25 (6.5 Gallon Water Heater)
Price: $675.00-$709.00
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Availability: Back Order

All Isotemp tanks come standard with the innovative Isotemp Temperature Control Safety Mixing Valve which protects users from scalding hot water. Water heated with engine heat exchangers can be heated to 190 degrees or more which can scald those unfamiliar with boat water heaters. Water will also be heated to 160+ degrees with just the electric heating element alone. By adjusting the valve, the Isotemp thermostat-controlled mixing valve mixes the boat’s water with the hot water to deliver the...

Isotemp SPA 30 (8 Gallon Water Heater)
Price: $677.00-$714.00
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Availability: Back Order

All Isotemp tanks come standard with the innovative Isotemp Temperature Control Safety Mixing Valve which protects users from scalding hot water. Water heated with engine heat exchangers can be heated to 190 degrees or more which can scald those unfamiliar with boat water heaters. Water will also be heated to 160+ degrees with just the electric heating element alone. By adjusting the valve, the Isotemp thermostat-controlled mixing valve mixes the boat’s water with the hot water to deliver the...

Isotemp SPA 40 (11 Gallon Water Heater)
Price: $711.00-$748.00
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Availability: Back Order

All Isotemp tanks come standard with the innovative Isotemp Temperature Control Safety Mixing Valve which protects users from scalding hot water. Water heated with engine heat exchangers can be heated to 190 degrees or more which can scald those unfamiliar with boat water heaters. Water will also be heated to 160+ degrees with just the electric heating element alone. By adjusting the valve, the Isotemp thermostat-controlled mixing valve mixes the boat’s water with the hot water to deliver the...

Isotemp Square 16 Stainless Steel
Price: $1,057.00-$1,059.00
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Availability: Back Order

The Isotemp Slim Square Stainless Steel Marine Water Heater comes with brushed stainless steel cover as well as innovative internal design. It achieves highest capacity by optimized installation of the engine water heat exchanger as well as the immersion heater. Isotemp Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. Isotemp features a brushed stainless steel cover and a 316-grade stainless steel inner tank that is backed by a 5-year...