Exterior Electric Tankless Water Heater – Which 5 Will Transform Your Space?

Over 70% of homeowners choose electric tankless water heaters for energy efficiency.

This trend is largely driven by models like the Rheem 18kW 240V Tankless Electric Water Heater, which offers unlimited hot water on demand.

What many don’t realize is that these units also feature smart technology for monitoring energy usage, making them a savvy choice for the eco-conscious.

Our review delves into the long-term value of these systems compared to traditional water heaters.

Rheem 18kW Electric Tankless Water Heater

Rheem 18kW 240V Tankless Electric Water Heater is designed to provide an endless supply of hot water, ideal for households with moderate hot water demands. This unit is particularly suited for families or small businesses that require consistent hot water for showers, dishwashing, and laundry. With dimensions of 18 x 14 x 4 inches and a sleek gray finish, it fits seamlessly into various installation spaces. Made from durable copper, this water heater ensures longevity and reliability while maintaining efficient performance.

The Rheem tankless water heater addresses the common problem of running out of hot water during peak usage times. Unlike traditional water heaters that store hot water, this model utilizes advanced self-modulation technology to adjust its power output based on real-time hot water needs, providing a steady flow rate of up to 4.4 gallons per minute (GPM). This feature enhances user experience by eliminating the frustration of fluctuating water temperatures.

Pros

• Efficient self-modulation technology for consistent hot water supply.
• Durable copper heating elements ensure longevity and easy maintenance.
• Simple installation with bottom 3/4 inch NPT water connections.
• External digital thermostatic control with LED display allows precise temperature adjustments.
• Compact design saves space compared to traditional water heaters.

Cons

• Initial cost may be higher compared to conventional water heaters.
• Requires a minimum electrical capacity for optimal performance.
• May not be suitable for larger households with extremely high hot water demands.

In terms of performance, the Rheem 18kW tankless water heater excels in providing reliable hot water on demand. Its standout features, such as the digital temperature display and easy-to-replace threaded connections, enhance usability and maintenance. This heater is best suited for small to medium-sized households or commercial spaces where hot water demand is moderate. However, users with extensive hot water needs may find its capacity limiting.

Overall, the Rheem 18kW 240V Tankless Electric Water Heater offers exceptional value for those seeking an efficient and reliable hot water solution. Its advanced technology and user-friendly features make it an excellent choice for families and small businesses aiming to improve their hot water experience.

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Rheem Tankless Electric Water Heater 11kW

Rheem 11kW 240V Tankless Electric Water Heater is designed to provide on-demand hot water for residential use, ideal for homeowners looking to enhance their hot water supply. Its compact design and adjustable digital temperature display ensure that users can easily monitor and control their hot water needs. With a flow rate of up to 2.68 GPM, this unit is perfect for small to medium-sized homes or apartments.

This electric tankless water heater solves the common problem of running out of hot water during showers or while using multiple appliances simultaneously. By heating water as needed, it improves the user experience by providing a consistent and continuous supply of hot water, eliminating the need for bulky storage tanks.

• Compact size fits easily in tight spaces.
• Durable construction ensures long-lasting performance.
• Self-modulating power control optimizes energy efficiency.
• Easy installation with standard 1/2″ NPT water connections.
• Adjustable temperature settings enhance user convenience.

• Flow rate may not be sufficient for larger households with high hot water demands.
• Initial cost may be higher compared to traditional water heaters.
• Requires a dedicated electrical circuit for optimal performance.

The Rheem 11kW Tankless Electric Water Heater excels in performance with its self-modulating technology, which adjusts power based on the water flow rate, ensuring efficiency and saving on energy bills. The adjustable digital temperature display is a standout feature, allowing users to set their desired water temperature easily. This heater is best suited for small families or individuals who prioritize space-saving solutions and consistent hot water availability.

Minor drawbacks include its flow rate limitations for larger households and the need for a dedicated electrical circuit, which may require additional installation costs. Overall, the Rheem 11kW Tankless Electric Water Heater offers excellent value for those seeking a reliable and efficient hot water solution.

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WINTEMP 27kW Electric Tankless Water Heater

The Electric Tankless Water Heater WINTEMP 27kW 240V is designed to provide an efficient and endless supply of hot water for residential use. Ideal for homeowners who seek a reliable hot water solution without the bulk of traditional tanks, this unit is perfect for families with 2-4 bathrooms or multiple usage points. With compact dimensions of 11.1” (W) x 19.1” (H) x 4” (D), it easily fits into tight spaces, making it a versatile choice for modern homes.

This tankless water heater solves the common problem of running out of hot water, ensuring a stable temperature throughout your shower or other hot water needs. Its impressive output of up to 6.5 gallons per minute (GPM) means you can enjoy hot water on demand without any waiting time.

Pros

• Energy Efficient: Achieves up to 99% energy savings, significantly reducing electricity costs compared to traditional water heaters.
• Space Saving: Wall-mounted design occupies 90% less space, making it ideal for homes with limited installation areas.
• Stable Water Temperature: Automatically adjusts to ensure consistent hot water without fluctuations, enhancing your shower experience.
• WiFi Control: Remote temperature adjustments provide convenience and ease of use, allowing you to manage settings from anywhere.
• Safety Features: Includes leakage, overheat, and dry-fire protections, ensuring safe operation for peace of mind.

Cons

• Installation Requirements: Requires specific electrical configurations, including 3 x 40 Amp double-pole breakers and 3 x 8/2 AWG wiring.
• Initial Cost: Higher upfront investment compared to traditional tank heaters, although savings on energy bills may offset this over time.

Performance-wise, the WINTEMP 27kW stands out with its innovative self-regulating technology, which optimizes energy use based on real-time flow and temperature. This feature not only conserves energy but also ensures that you never run out of hot water, making it a perfect fit for busy households. While the installation process may require professional assistance due to its electrical demands, the long-term benefits of energy savings and consistent hot water supply are undeniable.

In summary, the Electric Tankless Water Heater WINTEMP 27kW is best suited for families and individuals who prioritize efficiency, space-saving solutions, and safety in their hot water systems. With its advanced features and reliable performance, it represents a valuable investment for any modern home.

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ORBEK 14kW Electric Tankless Water Heater

The ORBEK 14kW Tankless Water Heater Electric is designed to provide instant hot water, making it ideal for homeowners needing efficient solutions for multiple points of use. This compact unit is perfect for small to medium-sized households, providing hot water for up to three outlets simultaneously. With dimensions of 14.2″H x 9.5″L x 3.1″W, it fits seamlessly into tight spaces while boasting a sleek design.

One of the standout features of the ORBEK tankless water heater is its impressive flow rate of up to 3.38 gallons per minute (GPM). This ensures a continuous supply of hot water, eliminating the frustration of lukewarm showers. The unit operates on a 240V/60AMP two-pole breaker, requiring specific wiring and connections, which may be a consideration for some users.

Performance-wise, this electric water heater excels in energy efficiency. It utilizes a water-electricity separation technique to minimize scale and corrosion, potentially reducing electricity costs by up to 60% compared to traditional tank-style heaters. The built-in chip adjusts the heating power 20,000 times per second, maintaining a stable water temperature within 1°F, which enhances the user experience during showers or baths.

Pros

• Provides instant hot water, ideal for multiple outlets.
• High energy efficiency, reducing electricity costs significantly.
• Compact design saves space and fits in various locations.
• Comprehensive safety features including leakage and over-temperature protection.
• LED digital display for easy temperature adjustments.

Cons

• Requires specific electrical setup, which may involve additional costs.
• Initial price point may be higher than traditional water heaters.
• May not be suitable for larger households needing higher GPM.

Overall, the ORBEK 14kW Tankless Water Heater is an excellent choice for small to medium-sized homes looking for an efficient, space-saving solution for hot water needs. Its combination of energy efficiency, safety features, and user-friendly design makes it a valuable investment for those wanting reliable hot water on demand.

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Rheem RTEX-24 24kW Electric Water Heater

The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater is designed to provide continuous hot water for residential use, making it ideal for families or individuals who require a reliable and efficient hot water solution. Its compact design, measuring approximately 16 x 14 x 4 inches and featuring a sleek gray finish, ensures it fits seamlessly into any utility space. Constructed from durable materials, this unit is built to last while delivering consistent performance.

This electric tankless water heater solves the problem of running out of hot water during peak usage times. With its powerful 24kW heating capacity, it can supply hot water on demand, ensuring that your household’s needs are met without interruption. The adjustable ON/OFF dial control, combined with a digital temperature display, allows users to set the temperature in 1-degree increments from 80 to 140 degrees Fahrenheit, providing precise control over hot water availability.

Pros

• Continuous hot water: No more cold showers or waiting for a tank to refill.
• Energy-efficient: Saves on utility bills by heating water only when needed.
• Compact design: Space-saving solution compared to traditional tank heaters.
• Easy installation: Requires no venting, simplifying the setup process.

Cons

• Electrical requirements: Needs 3 x 40 AMP double pole breakers and a 200 AMP household service.
• Temperature limitations: Groundwater temperature may affect performance in colder climates.

The Rheem RTEX-24 stands out for its impressive performance and efficiency. Unlike cheaper alternatives, this unit maintains a consistent hot water supply, ensuring comfort for all household activities. While it is best suited for homes with adequate electrical capacity, its benefits far outweigh its limitations. Users should consider their geographic location and local groundwater temperatures to ensure optimal performance.

In summary, the Rheem RTEX-24 is an excellent choice for families or individuals seeking a reliable and efficient hot water system. Its compact size, energy-saving capabilities, and continuous hot water supply make it a valuable addition to any home.

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Faq about exterior electric tankless water heater:

1: What is an exterior electric tankless water heater?

An exterior electric tankless water heater heats water on demand, providing hot water without the need for a storage tank. It is installed outside the home.

2: How does it work?

When a hot water tap is turned on, cold water flows through the unit, where electric elements heat it instantly, delivering a continuous supply of hot water.

3: What are the benefits of using one?

Benefits include energy efficiency, space savings, reduced utility bills, and an endless supply of hot water, making it ideal for large households.

4: Is installation difficult?

Installation requires electrical work and plumbing knowledge. It is recommended to hire a professional for proper setup and safety.

5: What maintenance is required?

Regular maintenance includes descaling to prevent mineral buildup and checking electrical connections to ensure optimal performance.

6: Are there any drawbacks?

Drawbacks may include higher upfront costs and the need for sufficient electrical capacity in your home.

7: How long do they last?

With proper maintenance, exterior electric tankless water heaters can last over 20 years, significantly longer than traditional tank heaters.

Conclusion

The Rheem 18kW Electric Tankless Water Heater exemplifies efficiency, delivering a robust flow rate ideal for larger households, while its compact design enhances space utilization. Its advanced technology ensures consistent hot water, making it a premier choice for those prioritizing performance and reliability.

Conversely, the Rheem 11kW model presents a commendable option for smaller residences, offering substantial energy savings without compromising on comfort. Its user-friendly features and reliable output make it an attractive solution for efficient water heating, catering to diverse consumer needs.