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1-2 weeks delivery time The Isotherm SFA00001AA is a small brass fitting kit (TP0105K) designed for Slim, Basic and Regular Isotherm water heaters. It provides durable corrosion-resistant connections for hot-water plumbing, ensuring proper sealing, long-term reliability and correct interface with heater inlet/outlet ports. |
$ 145.49
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1-2 weeks delivery time The Isotherm SFA00006AA is a big brass fitting kit (TP0100K) designed for Slim, Basic and Regular Isotherm water heaters. It provides large-diameter, corrosion-resistant brass connectors for hot-water plumbing, ensuring secure sealing and correct interface with heater inlet/outlet ports during installation or replacement. |
$ 340.77
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1-2 weeks delivery time The Isotherm SFA00007AA is a USA-standard 1/2" brass socket kit with internal threads for Slim, Basic and Regular Isotherm water heaters. It provides corrosion-resistant threaded connections for U.S. plumbing systems, ensuring secure sealing and proper adapter fit during installation or replacement. |
$ 42.12
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1-2 weeks delivery time The Isotherm SFA00008AA is a 1/2" brass T-fitting designed for marine hot-water and freshwater plumbing circuits. It provides a durable, corrosion-resistant three-way connection point for routing or splitting 1/2" lines in Isotherm water-heater installations or general onboard plumbing systems. |
$ 34.47
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1-2 weeks delivery time The Isotherm SFA00014AA is a T-fitting designed for the safety-valve connection on Isotherm Basic and Slim water heaters. The -06 version provides a durable brass interface that ensures proper routing between the heater, pressure-relief valve and system plumbing, maintaining reliable over-pressure protection and leak-free operation. |
$ 30.63
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1-2 weeks delivery time The Isotherm SFD00003AA is a water-mixing thermostat kit designed for Isotemp Basic and Slim-B water heaters manufactured before 2007. It ensures stable mixed-water output temperature, prevents scalding, and maintains correct hot- and cold-water blending through a durable marine-grade thermostatic valve assembly. |
$ 145.49
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1-2 weeks delivery time The Isotemp SFD00003AB mixing valve kit is designed for Isotemp Basic and Slim-B water heaters from 2007 onward. It stabilizes outlet temperature, protects onboard plumbing, and ensures safe hot-water delivery using marine-grade, corrosion-resistant components. |
$ 150.59
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1-2 weeks delivery time The Isotherm SFD00004AA is a Regular-series 4.0 kp/cm² (≈4 bar) safety valve (TP09021) for marine water heaters. It provides reliable over-pressure protection, automatically releasing excess pressure to prevent tank damage and ensure safe operation of Isotemp hot-water systems. |
$ 126.36
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1-2 weeks delivery time The Isotherm SFD00005AA is a 7-bar safety valve designed for Isotemp Basic and Slim marine water heaters. It provides automatic over-pressure protection, releasing excess pressure during heating cycles to prevent tank deformation, hose failure and system damage in onboard hot-water installations. |
$ 57.44
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1-2 weeks delivery time The Isotherm SFD00008AA is a 1¼" fitting kit equipped with a shut-off valve (TP39052) for SP-series installations. It provides a robust, corrosion-resistant connection assembly allowing controlled isolation of the water circuit, enabling safe maintenance, leak protection and reliable operation in marine systems. |
$ 168.47
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1-2 weeks delivery time The Isotemp SFD00011AA LK550 mixing valve (1/2" × 1/2", Ref. 090202) provides precise hot-water temperature control for marine water-heater systems. Built from corrosion-resistant materials, it stabilizes outlet temperature and protects plumbing fixtures onboard. |
$ 107.21
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1-2 weeks delivery time The Isotherm SFD00012AA is a water-mixing valve kit designed for Slim-A water heaters manufactured before 2004 and Slim Square models. It provides thermostatic hot- and cold-water blending, stabilizes outlet temperature and ensures safe, scald-free operation in marine hot-water systems. |
$ 145.49
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1-2 weeks delivery time The Isotherm SFD00023AA is a brass 7.0 kp/cm² (100 psi) safety valve for Isotemp Basic and Slim water heaters. The -06 version provides automatic over-pressure protection, venting excess pressure to prevent tank damage and ensure safe, reliable operation in marine hot-water systems. |
$ 122.52
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1-2 weeks delivery time The Isotemp SFD00031AA is a 5-bar safety valve designed for Slim Square 16L marine water heaters, providing reliable overpressure protection in compact hot-water installations. Built from corrosion-resistant materials, it ensures safe operation in demanding onboard environments. |
$ 57.44
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1-2 weeks delivery time The Isotherm SFD00033AA is a water-mixing thermostat kit designed for SPA systems equipped with an LK mixing valve. It provides thermostatic blending of hot and cold water, stabilizing outlet temperature and ensuring safe, controlled operation in marine hot-water circuits. |
$ 306.30
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1-2 weeks delivery time The Isotherm SFD00034AA is a water-mixing thermostat kit designed for SPA 15, 20, 25, 30 and 40 systems using the B-type mixing valve. It provides thermostatic hot- and cold-water blending, stabilizes outlet temperature and restores safe, controlled operation in marine hot-water circuits. |
$ 329.27
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1-2 weeks delivery time The Isotherm SFD00041AA is a thermostatic water-mixing valve kit designed for Isotemp Square water heaters. It provides controlled hot- and cold-water blending, ensuring a stable outlet temperature, improved system safety and protection against scalding in marine hot-water installations. |
$ 306.30
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1-2 weeks delivery time The Isotemp SFE00007AA flexible stainless-steel tube (9×13 mm, 1/2", length 245 mm) is designed for Isotemp Slim water heaters, providing a durable corrosion-resistant connection for hot-water plumbing. Its marine-grade construction ensures reliable vibration-proof performance in tight installation spaces. |
$ 30.63
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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.