The Rheem RTEX-27 is perfect for large households needing continuous hot water. With its powerful 27kW output, you’ll never run out of hot water again, even during peak usage times.
Plus, its compact design saves valuable space, making it a smart choice for any home.
We tested durability, ease of use, and more to ensure you get a reliable solution.



Rheem 24kW Electric Tankless Water Heater
Tired of running out of hot water during your showers? The Rheem RTEX-24 24kW Electric Tankless Water Heater fixes it with its self-modulating power control feature. This innovative technology ensures you have a consistent and continuous supply of hot water, perfect for busy households.
Why It Works
- On-demand hot water means no more waiting for a tank to refill, solving the problem of inconsistent water temperatures during peak usage times.
- Adjustable digital temperature display allows for precise control, ensuring you get the perfect temperature every time.
- Compact design saves space, making it ideal for smaller homes or apartments.
Trade-offs
- Premium price compared to traditional water heaters, but it lasts longer and is more energy-efficient, potentially saving you money on utility bills.
Overall, the Rheem RTEX-24 is worth it for frequent users who need reliable hot water on demand. Its advanced features address common hot water issues effectively, making it a solid investment for any household.
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Rheem RTEX-27 Tankless Water Heater
Tired of running out of hot water during your showers? The Rheem RTEX-27 240V Tankless Water Heater fixes it with its advanced self-modulation feature that adjusts power to meet your hot water demand. This ensures a continuous supply of hot water, making it perfect for households with multiple users.
Why It Works
- External digital thermostatic control with LED display allows precise temperature adjustments, so you can set it to your comfort level.
- Durable copper immersion heating elements provide reliable performance and are field serviceable, ensuring long-term use without the need for frequent replacements.
- Simple installation with bottom 3/4 inch NPT water connections makes it easy for both professionals and DIY enthusiasts to set up.
Trade-offs
- Premium price compared to traditional tank heaters, but it offers on-demand hot water and energy savings over time.
Overall, the Rheem RTEX-27 is worth it for frequent users who value consistent hot water availability and efficiency. Its features address common hot water issues effectively, making it a solid investment for any household looking to upgrade their water heating solution.
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Rheem 18kW Electric Tankless Water Heater
Tired of running out of hot water during your showers? The Rheem 18kW 240V Tankless Electric Water Heater fixes it with its advanced self-modulation feature, which adjusts power to meet your hot water demand seamlessly.
Why It Works
- Flow Rate of up to 4.4 GPM ensures you have enough hot water for multiple outlets, eliminating the frustration of cold showers.
- Durable copper immersion heating elements provide reliable performance, reducing the need for frequent replacements and repairs.
- External digital thermostatic control with LED display offers precise temperature settings, allowing you to enjoy your ideal water temperature every time.
- Simple installation with bottom 3/4 inch NPT water connections makes it easy for homeowners to set up without professional help.
Trade-offs
- Premium price compared to traditional water heaters, but the energy savings and consistent hot water supply make it a worthwhile investment.
Overall, the Rheem 18kW Tankless Water Heater is an excellent choice for frequent users who want a reliable and efficient hot water solution. Its features directly address common hot water issues, making it a smart addition to any home.
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EcoSmart 27 kW Tankless Electric Water Heater
Tired of running out of hot water during your shower? The EcoSmart ECOS 27 Tankless Electric Water Heater fixes it with its endless on-demand hot water feature. You’ll never have to wait for a tank to refill again, ensuring consistent hot water whenever you need it.
Why It Works
- Self-modulating technology continuously monitors water temperature, providing efficiency and performance within 1 degree of your selected temperature.
- 96% thermal energy efficiency means you save on energy costs since it only heats water when needed, unlike traditional tank heaters that waste energy maintaining temperature.
- Compact size allows for installation in tight spaces; it’s 90% smaller than traditional heaters, making it ideal for homes with limited space.
Trade-offs
- Premium price compared to conventional water heaters, but the long-term savings on energy bills and the convenience of endless hot water make it a worthy investment.
Overall, the EcoSmart ECOS 27 is worth it for frequent users who value efficiency and convenience. If you’re looking to upgrade to a reliable, space-saving hot water solution, this tankless heater is an excellent choice.
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Westinghouse 27kW Wi-Fi Tankless Water Heater
Tired of running out of hot water during your showers? The Westinghouse 27kW Tankless Water Heater solves this problem with its impressive capability of delivering up to 6.3 gallons per minute (GPM) of instant hot water. No more waiting for a tank to refill or worrying about temperature fluctuations; this unit provides a continuous supply of hot water on demand.
Why It Works
- Instant hot water means you can enjoy long showers without interruptions.
- Smart operation with Wi-Fi control allows you to adjust the temperature remotely, ensuring convenience.
- Safety features like leakage and overheat protection provide peace of mind, making it a reliable choice for families.
- Compact design saves space, perfect for small apartments or homes with limited installation options.
Trade-offs
- Premium price compared to traditional tank heaters, but the longevity and efficiency justify the investment.
Overall, the Westinghouse 27kW Tankless Water Heater is worth it for frequent users who value consistent hot water and modern convenience in their homes. Its advanced features and reliable performance make it an excellent choice for anyone looking to upgrade their hot water system.
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Faq about best Rheem 27kW tankless water heater:
1: What is the capacity of the Rheem 27kW tankless water heater?
The Rheem 27kW tankless water heater can provide hot water at a rate of up to 6.6 gallons per minute, making it suitable for medium to large households.
2: How energy efficient is the Rheem 27kW model?
This model boasts an energy efficiency rating of up to 99%, helping to reduce energy bills while providing continuous hot water.
3: What are the installation requirements?
Installation requires a 240V electrical supply and appropriate venting, typically necessitating professional installation for optimal performance.
4: Does it come with a warranty?
Yes, the Rheem 27kW tankless water heater typically includes a 15-year warranty on the heat exchanger and a 5-year warranty on parts.
5: Can it be used for multiple applications?
Yes, this heater can supply hot water for various applications, including showers, sinks, and appliances, simultaneously without running out.
6: Is maintenance required?
Regular maintenance, such as descaling, is recommended to ensure optimal performance and longevity of the unit.
Conclusion
Both the Rheem 24kW Electric Tankless Water Heater and the Rheem RTEX-27 Tankless Water Heater exemplify superior engineering and efficiency in the realm of instantaneous water heating solutions. The former, with its compact design and reliable performance, caters adeptly to moderate household demands, ensuring a consistent supply of hot water.
Meanwhile, the RTEX-27 stands out with its higher capacity, accommodating larger households or simultaneous hot water needs with remarkable efficacy. Together, these models reflect Rheem’s commitment to innovation, delivering unparalleled convenience and sustainability for discerning consumers.