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1-2 weeks delivery time The Isotemp 605023B000003 Basic 50L marine water heater features a 13-gallon stainless-steel tank with a 115V/750W immersion heater and an integrated mixing valve. With low-mounted heating components for uniform temperature distribution and optimized inlet/outlet design to reduce cold-water mixing, it delivers high-capacity output suitable for larger onboard hot-water systems. |
$ 1,578.65
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1-2 weeks delivery time The Isotemp 605031B000003 Basic 50L marine water heater features a 13-gallon stainless-steel tank, a 230V/750W immersion heater and an integrated mixing valve. With low-mounted heating components for uniform temperature distribution and inlet/outlet geometry engineered to reduce cold-water mixing, it provides high-capacity hot-water performance for large marine installations. |
$ 1,326.98
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1-2 weeks delivery time The Isotemp 605083B000003 Basic 50L marine water heater features a 13-gallon stainless-steel tank, a high-output 115V/1200W immersion heater and an integrated mixing valve. With low-mounted heating components for uniform heating and inlet/outlet geometry designed to reduce cold-water mixing, it provides fast heat-up performance and high-capacity onboard hot-water availability. |
$ 1,816.14
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1-2 weeks delivery time The Isotemp 6050B1B000003 Basic 50L marine water heater features a 13-gallon stainless-steel tank equipped with a high-output 230V/1200W immersion heater and an integrated mixing valve. Low-mounted heating elements ensure uniform heating, while optimized inlet/outlet geometry reduces cold-water mixing, delivering fast warm-up performance and high usable hot-water output for large onboard systems. |
$ 1,610.09
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1-2 weeks delivery time The Isotemp 607523B000003 Basic 75L marine water heater features a 20-gallon stainless-steel tank, a 115V/750W immersion heater and an integrated mixing valve. Low-mounted heating components ensure even heat distribution, while optimized inlet/outlet geometry reduces cold-water mixing, providing large-volume, stable hot-water output for bigger onboard systems. |
$ 1,962.83
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1-2 weeks delivery time The Isotemp 607523BD00003 Basic 75L marine water heater features a 20-gallon stainless-steel tank, a 115V/750W immersion heater, dual heat-exchange coils, a dual-thermostat system, a mixing valve and a USA plug. Low-mounted heating components ensure uniform water heating, while optimized inlet/outlet geometry minimizes cold-water mixing for high hot-water output on large vessels. |
$ 2,354
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1-2 weeks delivery time The Isotemp 607531B000003 Basic 75L marine water heater features a large 20-gallon stainless-steel tank with a 230V/750W immersion heater and an integrated mixing valve. Low-mounted heating components ensure uniform temperature distribution, while optimized inlet/outlet geometry minimizes cold-water mixing, providing high-volume hot-water output for large vessels and long-range cruising systems. |
$ 1,798.48
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1-2 weeks delivery time The Isotemp 607531BD00003 Basic 75L marine water heater features a 20-gallon stainless-steel tank with a 230V/750W immersion heater, double heat-exchange coils, a double-thermostat system and an integrated mixing valve. Low-mounted heating components ensure uniform heating, while optimized inlet/outlet geometry reduces cold-water mixing for high-capacity onboard hot-water output. |
$ 2,305.11
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1-2 weeks delivery time The Isotemp 607583B000003 Basic 75L HD marine water heater features a 20-gallon stainless-steel tank with a high-output 115V/1200W immersion heater and an integrated mixing valve. Low-mounted heating components provide uniform temperature distribution, while optimized inlet/outlet geometry reduces cold-water mixing for fast heat-up time and large-volume hot-water delivery on demanding marine systems. |
$ 2,072.85
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1-2 weeks delivery time The Isotemp 607591B000003 Basic 75L HD marine water heater features a 20-gallon stainless-steel tank equipped with a high-power 230V/2000W immersion heater and an integrated mixing valve. With low-mounted heating components for uniform heat distribution and optimized inlet/outlet geometry that minimizes cold-water mixing, it provides extremely fast heat-up times and high-volume hot-water output for large onboard systems. |
$ 1,962.83
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1-2 weeks delivery time The Isotemp 607591BD00003 Basic 75L HD heater features a 20-gallon stainless-steel tank, a high-power 230V/2000W immersion heater, double heat-exchange coils and an integrated mixing valve. With low-mounted heating components for uniform temperature distribution and optimized inlet/outlet design to reduce cold-water mixing, it delivers extremely fast heat-up times and large-volume hot water for demanding marine systems. |
$ 2,182.87
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1-2 weeks delivery time The Isotemp 601623QX00003 Slim Square 16L marine water heater features a 4.2-gallon stainless-steel tank, a 115V/750W immersion heater and a mixing valve. With a compact square footprint and low-mounted heating components for even temperature distribution, it offers high efficiency in confined installation spaces. |
$ 1,341.15
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Isotemp 601623QX00000 - 115V/750W Slim Square 16L Stainless Steel Marine Heater without Mixing Valve
1-2 weeks delivery time The Isotemp 601623QX00000 Slim Square 16L marine water heater features a compact 4.2-gallon stainless-steel tank with a 115V/750W immersion heater and an integrated engine-water heat exchanger. Designed without a mixing valve, it offers efficient heating and space-saving installation for small and mid-size vessels. |
$ 1,285.27
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Isotemp 601631QX00000 - 230V/750W Slim Square 16L Stainless Steel Marine Heater without Mixing Valve
1-2 weeks delivery time The Isotemp 601631QX00000 Slim Square 16L marine water heater features a compact 4.2-gallon stainless-steel tank with a 230V/750W immersion heater and an engine-water heat exchanger. Designed without a mixing valve, it provides efficient hot-water production and space-saving installation for small and medium-sized vessels. |
$ 1,063.79
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1-2 weeks delivery time The Isotemp 601631QX00003 Slim Square 16L marine water heater combines a compact 4.2-gallon stainless-steel tank with a 230V/750W immersion heater, engine-water heat exchanger and integrated mixing valve. Its space-efficient square design and low-mounted heating components ensure uniform heating and reliable hot-water delivery in confined installation spaces. |
$ 1,260.83
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Isotemp 6P1531SPA0100 - 230V/750W SPA 15L Stainless Steel Marine Heater without Safety, Mixing Valve
1-2 weeks delivery time The Isotemp 6P1531SPA0100 Spa 15L water heater features a 4-gallon stainless-steel inner tank, polypropylene outer casing and a 230V/750W immersion heater. Delivered without a safety valve or mixing valve, it provides a compact, cost-efficient hot-water solution for installations that use external protection and temperature-control components. |
$ 670.85
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1-2 weeks delivery time The Isotemp 6P1531SPA0003 Spa 15L marine water heater features a 4-gallon stainless-steel inner tank, robust polypropylene outer casing, 230V/750W immersion heater, 6 bar safety valve, integrated mixing valve and European plug. With a cylindrical 19.3" × 12.7" footprint and marine-grade components, it offers compact, safe and cost-efficient hot-water production for small onboard systems. |
$ 936.01
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1-2 weeks delivery time The Isotemp 6P2023SPA0003 Spa 20L marine water heater features a 5.3-gallon stainless-steel inner tank, durable polypropylene casing, a 115V/750W immersion heater, 6-bar safety valve, integrated mixing valve and USA plug. Its compact 23.2" × 12.7" cylindrical design provides efficient, safe and cost-optimized hot-water production for small and medium vessels. |
$ 1,037.30
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What are the primary features of the Isotemp marine water heater?
The Isotemp marine water heaters are specifically designed for use on yachts and boats, featuring a compact design like the Isotemp Slim and Isotemp Slim Square models, ideal for tight spaces. These water heaters come with high-quality components, including a heat exchanger that uses engine heat to warm the water in the tank. These Boat Hot Water Heater solutions come with high-quality components, including a heat exchanger that uses engine heat to warm the water in the tank. Available in various capacities, such as the 4.2-gallon (16L) or larger options like 25L and 40L, they also include a mixing valve to regulate water temperature, providing reliable performance onboard.
What are the key differences between the Isotemp Slim and Isotemp Basic water heaters?
The key differences between the Isotemp Slim and Isotemp Basic water heaters lie in their size and design. The Slim models, such as the Isotemp Slim 25L, are specifically designed for use in tight spaces on boats, featuring a compact design with high-quality components. In contrast, the Basic models, like the Basic 40L and Basic 75L, offer larger water tanks and come with standard features such as a mixing valve that regulates water temperature, providing additional protection and reliability for marine applications. Both lines can be effectively integrated into a Boat Heater system to ensure consistent hot water supply and onboard comfort.
What are the main safety features included in the Isotemp Spa water heater?
The Isotemp Spa Marine Water Heater is equipped with several key safety features, including a safety valve that helps regulate pressure and prevent overheating. It is designed with high-quality components, providing an additional layer of protection, and comes standard with a mixing valve to control water temperature. These features ensure reliable and safe operation for marine use, even in challenging conditions.
How does the Isotemp Slim Square water heater save space on boats and yachts?
The slim water heater utilizes a uniquely shallow, rectangular design that fits perfectly into narrow voids behind joinery or flat against bulkheads, spaces typically wasted on vessels. This efficient Slim Square profile unlocks installation possibilities in areas where conventional cylindrical heaters are impossible to place, directly preserving valuable cabin and storage room.
What role does the heating element play in maintaining consistent water temperature in Isotemp water heaters?
The electric heating element acts as the primary precision tool for raising and holding temperature. When the thermostat signals a drop, the 750w electric element activates to heat the water to the exact setpoint, ensuring the tank is always ready. For consistent warmth during use, the system seamlessly integrates multiple heat sources:
- The engine heat exchanger uses engine coolant from the coolant loop to heat the water while underway.
- The electrical immersion heater maintains temperature at the dock.
- A dedicated thermostat-controlled mixing valve then blends cold and hot water to deliver a safe, stable output.
How does the mixing valve in an Isotemp water heater enhance safety and comfort?
| Valve Mechanism | Safety Outcome | Comfort & Efficiency Gain |
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| Pre-Delivery Tempering | Eliminates the possibility of unmixed, stored water exiting the heater, preventing potential thermal injury at the tap. | Provides immediately usable water at a preselected temperature, removing the need for manual adjustment and reducing water waste. |
| Pressure-Balancing Spool | Instantly counteracts a drop in cold inlet pressure by proportionally restricting hot flow, averting a sudden temperature surge. | Maintains a stable shower temperature when other fixtures like washing machines or toilets are activated elsewhere in the system. |
| Fail-Safe Thermal Cutoff | A non-electrical wax actuator fully shuts off hot water outflow if the cold supply fails, ensuring a default safe state. | Operates automatically and independently, offering permanent protection without user maintenance or external power. |
| Factory-Set Limit Stop | Allows for a fixed maximum output temperature to be defined and mechanically locked, preventing accidental override. | Creates a uniform and predictable hot water experience across all household outlets, tailored to safe usage standards. |
What are the advantages of the 20L Isotemp water heater model for small vessels?
The compact Spa 20 model delivers a practical volume of hot water for its size, efficiently heated to 160 degrees using either the engine heat exchanger or its 750w electric element. Its smaller footprint and 11 gallon capacity make it the ideal balanced solution for galleys and heads on trailers, weekend sailboats, or any craft where space and weight are primary considerations.
How does the stainless steel water tank design improve durability in Isotemp and Isotherm systems?
The stainless steel inner tank is the foundational defense against corrosion and failure. Isotemp stainless steel marine water heaters are built to withstand the demanding marine environment for years. This robust material resists the corrosive effects of water heated and stored for long periods, unlike glass-lined or plastic tanks. The integrity of this hot water tank is backed by a strong 5-year limited warranty, reflecting trust in its longevity. Key protective features include:
- A brushed stainless steel cover for external protection.
- A safety mixing valve to prevent overheating.
- A pressure relief valve as a standard safety backup.