best atmor 18kw tankless water heater – Surprising Features You Didn’t Expect
For homeowners, the Atmor 18kW tankless water heater delivers instant hot water without the wait.
The Atmor PRO XTP Series 18kW is perfect for modern households seeking efficiency and convenience. This self-modulating electric heater provides whole-home hot water on demand, ensuring you never run out during peak usage.
From small apartments to large homes, this versatile unit adapts to various needs, supplying up to 3.8 GPM while maintaining a stable temperature. Enjoy the benefits of immediate hot water for multiple fixtures simultaneously.
We detail pros, cons, and hidden perks ahead.


Atmor PRO XTP 18kW Tankless Water Heater
Atmor PRO XTP Series 18kW 3.8 GPM Self-Modulating Electric Tankless Water Heater: compact design, stainless steel internals, 2-year warranty.
Benefits
- Supports multiple showers simultaneously, perfect for 1-2 bathrooms.
Drawbacks
- Requires specific electrical setup: needs (2) 40 amp double pole breakers.
This water heater is ideal for those living in warm climates, providing instant hot water without the wait. The self-modulating technology ensures energy efficiency, reducing costs by up to 50%. Users can set precise temperatures between 90°F and 125°F in 1°F increments, allowing for customized comfort. The compact, wall-mounted design makes it a great fit for small spaces, maximizing utility without sacrificing room. The built-in over-temperature protection enhances safety, making it a reliable choice for families.
However, potential buyers should be aware of the electrical requirements, as it necessitates specific wiring and breakers for installation. Additionally, it is not suitable for larger households that may require more than 3.8 GPM of hot water simultaneously.
A practical pick for small spaces, the Atmor PRO XTP Series is designed for efficiency and reliability, making it an excellent choice for homeowners looking to upgrade their hot water system.
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ORBEK 18kW Electric Tankless Water Heater
Orbek Instant On Demand Hot Water Heater: 18kW, 240V, 4.17 GPM, ETL certified, compact size 17”H x 13”L x 3.9”W.
Benefits
- Provides endless hot water for 2-3 fixtures simultaneously.
- Energy-efficient, potentially reducing electricity costs by up to 60% compared to traditional heaters.
- Stable temperature control within 1°F for a comfortable shower experience.
- Easy installation in small spaces, saving over 50% of space.
Drawbacks
- Requires specific electrical setup (2 x 240V/40A breakers).
- No tank storage for hot water.
This tankless water heater is a practical pick for small spaces and those seeking efficient hot water solutions. The compact design and high efficiency make it an ideal choice for modern homes. The LED digital display adds convenience, allowing for easy temperature adjustments. However, potential buyers should ensure their home electrical system meets the requirements for installation. Overall, the Orbek Instant Hot Water Heater delivers on its promise of instant hot water with impressive energy savings.
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Rheem 18kW Tankless Electric Water Heater
Rheem 18kW 240V Tankless Electric Water Heater: 12” long, ABS plastic, 2-year warranty.
Benefits
- Flow Rate: Up to 4.4 GPM, ensuring consistent hot water supply.
- Digital Control: External digital thermostatic control with LED display offers +/- 1 degree accuracy.
- Self-Modulation: Most advanced self-modulation adjusts power to meet hot water demand efficiently.
- Durability: Features durable copper immersion two heating elements that are field serviceable.
- Installation: Simple installation with bottom 3/4 inch NPT water connections, making it user-friendly.
Drawbacks
- Maintenance: Requires occasional maintenance for optimal performance.
- No dishwasher-safe: Parts are not dishwasher-safe, necessitating manual cleaning.
A practical pick for small spaces, the Rheem 18kW Tankless Water Heater is ideal for those seeking an efficient and reliable hot water solution without the bulk of traditional tanks. Its compact design allows for easy installation in various settings, making it perfect for apartments or smaller homes. With advanced features like self-modulation and precise temperature control, it meets modern hot water needs effectively. However, users should be prepared for manual cleaning as no parts are dishwasher-safe. Overall, it’s a solid investment for anyone looking to optimize their hot water system.
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WINTEMP 18kW Electric Tankless Water Heater
18kW Tankless Water Heater Electric 240V WINTEMP: 11.1” (W) x 19.1” (H) x 4” (D), ETL Certified, WiFi Control, 2-year warranty.
Benefits
- Provides up to 4.3 GPM for continuous hot water supply.
Drawbacks
- Requires professional installation due to electrical specifications.
The WINTEMP 18kW Tankless Water Heater is an efficient solution for residential hot water needs. Its compact design saves space, making it ideal for small areas. With a maximum output of 4.3 gallons per minute, it ensures you won’t run out of hot water during showers or while using appliances. The self-regulating technology enhances energy efficiency, achieving up to 99% savings compared to traditional tank heaters.
Installation requires specific electrical requirements, including 2 x 40 Amp DP breakers, which might necessitate professional help. However, once set up, the unit operates seamlessly, adjusting power based on water flow and temperature, providing stable hot water without fluctuations.
Safety features like leakage protection and overheat protection give peace of mind. The WiFi control allows for remote temperature adjustments, adding convenience. Overall, this tankless water heater is a practical pick for small spaces, delivering reliable performance and energy savings.
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ThermoMate 18kW Electric Tankless Water Heater
Tankless Water Heater Electric 18kW at 240 Volt, ThermoMate On Demand Instant Hot Water Heater: 17.12” x 13.12” x 3.12”, ETL certified, 2-year warranty.
Benefits
- Provides unlimited hot water in just 3 seconds, ensuring no more cold showers.
- 99.8% energy efficiency saves up to 60% on water heating costs compared to traditional tank heaters.
- Compact design fits easily in small spaces, freeing up floor space.
Drawbacks
- Requires a 76Amp breaker and specific wiring, which may complicate installation.
- No dishwasher-safe parts, limiting cleaning options.
This tankless water heater is ideal for those who need a reliable hot water solution without the bulk of a traditional tank. It’s particularly suited for small spaces, such as apartments or tiny homes, where every inch counts. The smart operation adjusts energy consumption based on incoming water temperature, ensuring maximum efficiency and consistent hot water delivery. However, potential users should note the installation requirements, including the need for proper electrical setup, which may necessitate additional costs. Overall, the ThermoMate 18kW is a practical pick for anyone seeking an efficient, space-saving hot water solution.
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Faq about best atmor 18kw tankless water heater:
1:What is the capacity of the Atmor 18kW tankless water heater?
The Atmor 18kW tankless water heater provides hot water on demand, suitable for multiple outlets simultaneously, depending on temperature rise and flow rate.
2:How energy efficient is the Atmor 18kW model?
It boasts a high energy efficiency rating, helping reduce energy bills by heating water only when needed.
3:What is the installation process for the Atmor 18kW?
Installation typically requires a licensed electrician for proper electrical connections and compliance with local codes.
4:Can the Atmor 18kW handle a large household?
Yes, it is designed to meet the hot water demands of medium to large households, providing continuous hot water supply.
5:What are the maintenance requirements for this unit?
Regular descaling and checking for mineral buildup are recommended to maintain efficiency and longevity.
6:Does the Atmor 18kW come with a warranty?
Yes, it typically includes a manufacturer warranty, covering parts for a specified period.
7:What are the dimensions of the Atmor 18kW?
The unit is compact, making it easy to install in various locations, including tight spaces.
Conclusion
The Atmor PRO XTP 18kW Tankless Water Heater exemplifies efficiency and innovation, delivering instantaneous hot water while optimizing energy consumption. Its compact design and advanced technology position it as a premier choice for modern households seeking reliability and performance.
Conversely, the ORBEK 18kW Electric Tankless Water Heater stands out for its robust construction and user-friendly interface, ensuring a seamless experience. Both products reflect a commitment to excellence, catering to diverse needs while enhancing the comfort and convenience of daily living.





