Are you tired of running out of hot water during showers? The Rheem 18kW Tankless Water Heater provides continuous hot water on demand.
This efficient unit heats water instantly, ensuring you have a stable temperature for your needs. With a flow rate of up to 4.17 GPM, it simplifies hot water supply for multiple fixtures simultaneously, making it ideal for busy households. Its compact design saves space, while the ETL certification guarantees safety and reliability.
In our full review, we break down performance, durability, and more to help you choose the best tankless water heater for your home.
Rheem 18kW Tankless Electric Water Heater
The adjustable valve sets the Rheem 18kW 240V Tankless Electric Water Heater apart from its competitors. Constructed with durable copper immersion heating elements, this unit ensures efficient heating while maintaining a sleek design in a compact form factor, measuring 18 x 14 x 3.5 inches. The heater’s advanced self-modulation technology allows it to adjust power output based on hot water demand, delivering a flow rate of up to 4.4 GPM.
Key Advantages
- The use of 316-grade stainless steel components enhances durability and resists corrosion, ensuring longevity in various environments.
Limitations
- It is not compatible with traditional water heating systems, which may require additional adjustments during installation.
This water heater is best for outdoor enthusiasts needing a reliable and efficient hot water solution for cabins, RVs, or outdoor showers. Its simple installation with bottom 3/4 inch NPT water connections and digital temperature display makes it user-friendly, while the field-serviceable heating elements provide convenience for maintenance. Overall, the Rheem 18kW Tankless Water Heater is an excellent choice for those seeking modern technology combined with robust performance.
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ORBEK 18kW Electric Tankless Water Heater
The adjustable valve sets the ORBEK 18kW Tankless Water Heater apart from its competitors, allowing for precise temperature control and efficient hot water delivery. Constructed from 316-grade stainless steel, this unit resists corrosion, ensuring durability and longevity. With dimensions of 17″H x 13.0″L x 3.9″W, it is compact enough to fit in tight spaces, making it ideal for various installations.
Key Advantages
- The heater provides up to 4.17 GPM of on-demand hot water, supporting 2-3 fixtures simultaneously.
- Its high energy efficiency is achieved through water-electricity separation, potentially cutting electricity costs by up to 60% compared to traditional tank-style heaters.
- Advanced safety features such as leakage protection and over-temperature protection ensure user safety, with ETL certification confirming its reliability.
- The built-in chip maintains a stable temperature within 1°F, adjusting heating power 20,000 times per second for a consistent shower experience.
- The LED digital display facilitates easy temperature adjustments between 86°F and 140°F, providing real-time feedback.
Limitations
- The ORBEK heater is not compatible with traditional tank water heaters and requires specific installation components, including 2 x 240V/40A breakers.
Best for outdoor enthusiasts needing a reliable and efficient hot water solution, the ORBEK 18kW Tankless Water Heater excels in performance and safety, making it a top choice for modern homes.
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HYDRO MASTER Tankless Water Heater Valve Kit
The adjustable valve sets the HYDRO MASTER Tankless Water Heater Service Valve Kit apart from competitors. Constructed from thick, forged Lead Free brass, this kit ensures both strength and leak prevention. The dimensions are designed to fit standard 3/4-inch IPS connections, making it a versatile choice for various installations.
Key Advantages
- The 316-grade stainless steel components resist corrosion, enhancing durability in demanding environments.
Limitations
- Not compatible with non-standard valve systems, limiting its use in some unique setups.
This all-in-one kit includes hot and cold isolation valves rated at 500WOG, along with a pressure relief valve capable of handling 150 PSI and 200,000 BTU. The full port ball valves ensure maximum water flow, significantly improving system performance and efficiency. The color-coded handles allow for easy identification between hot and cold water lines, facilitating a straightforward installation process.
Best for outdoor enthusiasts needing a reliable and efficient solution for their tankless water heater systems, the HYDRO MASTER kit meets all federal and state standards for lead content in drinking water system components and is CSA certified. This product is an excellent choice for those looking to enhance their water heating systems with a durable and easy-to-install solution.
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Rheem 24kW Electric Tankless Water Heater
The adjustable valve sets the Rheem RTEX-24 24kW 240V Electric Tankless Water Heater apart in the competitive market of home water heating solutions. Constructed from durable 316-grade stainless steel, this unit is designed to resist corrosion, ensuring longevity and reliability. It measures 18.5 x 14.5 x 4.5 inches, making it compact enough for various installations.
Key Advantages
- The **ON/OFF Dial Control** with an adjustable digital temperature display allows users to set temperatures in precise 1-degree increments from 80 to 140 degrees Fahrenheit, catering to specific hot water needs.
- Its **tankless design** not only saves space but also provides continuous hot water, making it ideal for larger households.
- The unit operates efficiently, reducing energy costs by heating water on demand without the need for a storage tank.
Limitations
- It is **not compatible** with 120V electrical systems, requiring a dedicated 240V setup with three 40 AMP double pole breakers.
- Groundwater temperature can impact performance, necessitating a review of the performance guide to ensure it meets regional hot water demands.
Best for outdoor enthusiasts needing a reliable and efficient hot water solution, the Rheem RTEX-24 is a solid investment for those seeking continuous, adjustable hot water without the bulk of traditional heaters.
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ThermoMate 18kW Electric Tankless Water Heater
The adjustable valve sets the ThermoMate Tankless Water Heater apart, providing precise control over water temperature. This electric unit operates at 18kW and requires a 240V connection, drawing a maximum of 76 amps. Constructed from durable materials, it features a compact design measuring 17.12″ x 13.12″ x 3.12″, making it ideal for residential indoor installations where space is at a premium.
Key Advantages
- Its **self-modulating technology** ensures energy is used only when needed, achieving an impressive **99.8% efficiency**, which can save homeowners up to 60% on water heating costs compared to traditional tank systems.
Limitations
- It is **not compatible** with standard 120V systems, requiring specific electrical configurations, including a dedicated 80-amp breaker with two sets of double-pole 40-amp breakers.
This unit is best for outdoor enthusiasts and homeowners needing an efficient, on-demand hot water solution. With its ability to deliver hot water in just three seconds and maintain a steady temperature, it eliminates the frustration of cold showers. The digital temperature display allows for adjustments in 1°F increments, ensuring optimal comfort. Overall, the ThermoMate Tankless Water Heater is a robust choice for those seeking a reliable and space-saving hot water solution.
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Faq about Rheem 18kW Tankless Water Heater:
1: What is the capacity of the Rheem 18kW tankless water heater?
The Rheem 18kW tankless water heater can provide hot water for multiple fixtures simultaneously, suitable for medium to large homes.
2: How energy efficient is the Rheem 18kW model?
This model boasts a high energy efficiency rating, helping to reduce energy bills while providing reliable hot water on demand.
3: What are the installation requirements?
Installation requires a dedicated electrical circuit and proper venting for optimal performance; professional installation is recommended.
4: Does it have a warranty?
Yes, the Rheem 18kW tankless water heater typically comes with a limited warranty, covering parts for several years.
5: Can it be used in colder climates?
Yes, this unit is designed to operate efficiently in colder climates, but may require additional insulation for optimal performance.
6: How long does it take to heat water?
The Rheem 18kW heats water almost instantly, providing hot water as soon as a tap is turned on.
7: Is it suitable for large households?
Yes, it is suitable for large households, providing continuous hot water for multiple users without interruption.
Conclusion
Both the Rheem 18kW Tankless Water Heater and the ORBEK 18kW Electric Tankless Water Heater exemplify cutting-edge technology in the realm of water heating solutions. The Rheem model is lauded for its efficiency and reliability, ensuring a consistent supply of hot water, while the ORBEK variant impresses with its compact design and energy-saving features.
Ultimately, selecting between these two exceptional products hinges on specific needs and preferences. The Rheem offers robust performance ideal for larger households, whereas the ORBEK presents a sleek option suitable for space-constrained environments, catering to diverse consumer requirements.