Cheap heaters underperform—but Rheem RTEX-27 delivers exceptional efficiency.
When it comes to tankless water heaters, choosing the right model is vital for comfort and savings. The **EcoSmart ECOS 27** offers energy-efficient heating, while the **Rheem RTEX-27** excels in providing consistent hot water on demand.
For homeowners seeking reliability, the Rheem RTEX-27 features advanced self-modulating technology that optimizes energy use, ensuring hot water is always available.
Below, we analyze budget, lifespan, and real-user feedback.
EcoSmart 27 kW Tankless Electric Water Heater
The adjustable valve sets the EcoSmart ECOS 27 Tankless Electric Water Heater apart from its competitors. This unit operates at 27 kW, powered by 240 Volts and 112.5 Amps, enabling it to deliver endless on-demand hot water efficiently. Constructed from durable materials, it features a compact design with dimensions of 19 x 4.25 x 9.25 inches, making it 90% smaller than traditional tank heaters, allowing for versatile installation options on walls or at point-of-use locations.
Key Advantages
- The 316-grade stainless steel components resist corrosion, ensuring longevity and reliability.
- With a thermal efficiency rating of 96%, it only heats water when needed, significantly reducing energy consumption compared to conventional tank heaters.
- Self-modulating technology continuously monitors water temperature and flow rates, maintaining performance within 1 degree of the selected temperature.
- Ideal for low-flow applications, it provides between 2.7 and 6.6 gallons-per-minute, depending on the inlet water temperature.
Limitations
- Not compatible with high-demand applications requiring simultaneous hot water for multiple outlets.
- Installation may require an electrician for proper setup at the 240-volt level.
Best for outdoor enthusiasts and small households needing reliable hot water for bathrooms, small sinks, or office breakrooms, the EcoSmart ECOS 27 excels in efficiency and space-saving design.
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Rheem RTEX-27 Tankless Water Heater
The adjustable valve sets the Rheem RTEX-27 240V 3 Heating Chambers Residential Tankless Water Heater apart from its competitors. This innovative feature allows users to fine-tune water temperature with precision, ensuring optimal performance tailored to specific needs. The unit is constructed from durable materials, featuring copper immersion three heating elements that are field serviceable, and it measures 18.5 x 14 x 3.625 inches, making it compact for various installation scenarios.
Key Advantages
- The 316-grade stainless steel components resist corrosion, enhancing the unit’s longevity and reliability.
Limitations
- Not compatible with traditional tank water heaters, which may require additional adjustments during installation.
This tankless water heater also features an external digital thermostatic control with an LED display, providing +/- 1 degree accuracy for precise temperature management. Its most advanced self-modulation technology automatically adjusts power to meet hot water demand, ensuring efficiency and reducing energy costs.
Best for outdoor enthusiasts needing a reliable and efficient hot water solution, the Rheem RTEX-27 stands out for its performance and durability, making it an ideal choice for both residential and outdoor applications.
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Rheem 18kW Electric Tankless Water Heater
The adjustable valve sets the Rheem 18kW 240V Tankless Electric Water Heater apart from competitors. This feature allows for precise temperature control, ensuring optimal hot water delivery tailored to user needs. Constructed from durable copper, the unit houses two immersion heating elements that are field serviceable, enhancing longevity and ease of maintenance. With dimensions of 14.5 x 18 x 5.5 inches, this compact heater is designed to fit seamlessly in various installations. It offers a flow rate of up to 4.4 GPM, making it suitable for medium-sized households.
Key Advantages
- The 316-grade stainless steel components resist corrosion, ensuring durability and reliability over time.
Limitations
- Not compatible with traditional tank water heating systems, which may limit options for some users.
Best for outdoor enthusiasts needing a reliable and efficient hot water solution, the Rheem 18kW Tankless Water Heater excels in performance and ease of use. Its advanced self-modulation technology adjusts power output based on hot water demand, making it an ideal choice for those who prioritize efficiency and convenience in their hot water systems.
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Rheem RTEX-24 Electric Tankless Water Heater
The adjustable valve sets the Rheem RTEX-24 24kW 240V Electric Tankless Water Heater apart, allowing for precise temperature control. This unit is constructed from durable materials, featuring a sleek gray exterior that houses advanced technology. It measures 18.5 x 14.5 x 4.5 inches, making it compact enough for various installations.
Key Advantages
- The use of **316-grade stainless steel** resists corrosion, ensuring longevity and reliability in performance.
- The **ON/OFF Dial Control** with an adjustable digital temperature display allows users to set temperatures in 1-degree increments, ranging from 80 to 140 degrees Fahrenheit, offering excellent customization.
- Its **tankless design** saves valuable space and energy, eliminating the need for bulky storage tanks.
Limitations
- Not compatible with existing traditional water heating systems, requiring a complete upgrade for those looking to switch.
- Requires **3 x 40 AMP Double Pole Breakers** and a 200 AMP household service, which may necessitate electrical system upgrades.
Best for outdoor enthusiasts needing a reliable and efficient hot water solution, the Rheem RTEX-24 is ideal for homes that require continuous hot water without the space constraints of traditional heaters. Its advanced features and durable construction make it a top choice for modern households.
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Rheem 11kW Electric Tankless Water Heater
The adjustable valve sets the Rheem 11kW 240V Tankless Electric Water Heater apart from its competitors. This feature allows users to customize water temperature settings with precision, ensuring optimal performance for various applications. Constructed from high-quality materials, including a durable plastic housing and 316-grade stainless steel heating elements, this unit measures 18.5 x 14.5 x 4.5 inches, making it compact enough for tight installations.
Key Advantages
- The self-modulating power control intelligently adjusts energy usage based on demand, promoting efficiency and reducing energy costs.
- With a flow rate of up to 2.68 GPM, it provides consistent and continuous hot water, ideal for households with moderate hot water needs.
- Side 1/2″ NPT water connections facilitate easy installation and compatibility with standard plumbing systems.
Limitations
- Not compatible with 3-phase electrical systems, which may limit its use in certain commercial settings.
- Requires a minimum electrical supply of 240V, which may necessitate electrical upgrades in older homes.
Best for outdoor enthusiasts needing a reliable and efficient water heating solution, the Rheem 11kW model is an excellent choice for those seeking on-demand hot water without the bulk of traditional water heaters.
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Faq about best Rheem 27kW tankless water heater:
1: What is the best Rheem 27kW tankless water heater?
The best Rheem 27kW tankless water heater is the Rheem Performance Platinum series, known for its efficiency and reliability.
2: How does the Rheem 27kW tankless water heater work?
This unit heats water on demand, using a high-efficiency heating element that provides a continuous supply of hot water.
3: What are the energy efficiency ratings for this model?
The Rheem 27kW tankless water heater typically has an energy factor (EF) rating of up to 0.94, indicating high efficiency.
4: What is the warranty on the Rheem 27kW tankless water heater?
This model usually comes with a 12-year limited warranty on the heat exchanger and a 5-year warranty on parts.
5: Can the Rheem 27kW tankless water heater be installed indoors?
Yes, it is suitable for indoor installation, but proper ventilation and clearance must be maintained.
6: What is the flow rate of the Rheem 27kW tankless water heater?
This unit can provide a flow rate of up to 6.6 gallons per minute, depending on the inlet water temperature.
7: Is professional installation recommended?
Yes, professional installation is recommended to ensure safety and optimal performance.
Conclusion
Both the EcoSmart 27 kW and Rheem RTEX-27 tankless water heaters exemplify cutting-edge engineering, providing efficient and on-demand hot water solutions. The EcoSmart model is lauded for its compact design and energy-saving capabilities, catering to eco-conscious consumers seeking sustainability without sacrificing performance.
Conversely, the Rheem RTEX-27 stands out for its robust build and advanced temperature control features, ensuring consistent hot water delivery tailored to user preferences. Together, these products represent the pinnacle of modern water heating technology, offering unparalleled convenience and reliability for diverse household needs.