Top 8 Rheem Tankless Water Heaters for Optimal Performance

Steve Donaldson Master HVAC technician
Steve Donaldson
Master HVAC technician at Quality Comfort Home Services

I am Steve Donaldson, a Master HVAC technician with a rich background in addressing heating issues, especially when it comes to various types of water heaters. Leveraging my extensive expertise, I offer insights and advice to help individuals maintain a warm and secure home environment. Reach out to me at steve.donaldson@tedreviews.com for valuable tips from a seasoned professional in the industry.

Steve Donaldson Master HVAC technician
Steve Donaldson
Master HVAC technician at Quality Comfort Home Services

I am Steve Donaldson, a Master HVAC technician with a rich background in addressing heating issues, especially when it comes to various types of water heaters. Leveraging my extensive expertise, I offer insights and advice to help individuals maintain a warm and secure home environment. Reach out to me at steve.donaldson@tedreviews.com for valuable tips from a seasoned professional in the industry.

Hey there! If you're in the market for a new tankless water heater, you've come to the right place. In this post, I'll be sharing with you the top 8 Rheem tankless water heaters that are guaranteed to deliver optimal performance. Whether you're looking to save space, reduce energy consumption, or have hot water on demand, Rheem has got you covered. So, let's dive in and find the perfect tankless water heater for your needs!

1
Rheem RTEX-27 Tankless Water Heater
✯ Top-notch choice ✯
BUY NOW Amazon.com
8.9
2
Rheem RTEX-13 Tankless Water Heater, Gray
Overall Verdict: Reliable and Efficient
BUY NOW Amazon.com
8.7
3
Rheem Tankless Electric Water Heater
8.7
6
Rheem 8kW Tankless Electric Water Heater
Verdict: Reliable and efficient
BUY NOW Amazon.com
7.8
1

Rheem RTEX-27 Tankless Water Heater

$745.99
$710.44
Amazon.com
as of April 19, 2024 9:08 pm
8.9
Top-notch choice
The Rheem RTEX-27 240V tankless water heater offers an unlimited supply of hot water with accurate temperature control, thanks to its advanced self-modulation and digital thermostatic control. While installation may require additional electrical work and a knowledgeable contractor, it is a durable and reliable option with a reputable brand backing it.
Efficient and Reliable
  • Unlimited supply of hot water
  • Accurate and dependable temperature control
  • Digital temperature control for precise settings
  • Brand reputation
Drawbacks
  • Requires additional electrical work and a knowledgeable contractor for installation
  • May cause LED lights to flicker when in use

The Rheem RTEX-27 240V 3 Heating Chambers Residential Tankless Water Heater is a professional classic tankless electric water heater that offers continuous hot water quickly and on demand. It features an external digital thermostatic control with LED display for precise temperature adjustment (+/-1 degree accuracy). The most advanced self-modulation feature allows the heater to automatically adjust its power to meet the hot water demand, ensuring optimal efficiency. With its durable copper immersion three heating elements, this water heater is built to last and is field serviceable. Installation is simple with the bottom 3/4 inch NPT water connection. This tankless water heater is a great choice for single point-of-use or multiple applications, providing unlimited hot water whenever you need it.

Efficient and Powerful Heating Solution
  • External digital thermostatic control with LED display
  • Most advanced self-modulation
  • Durable Copper immersion three heating elements
  • Simple installation
$710.44
$745.99
as of April 19, 2024 9:08 pm
Amazon.com
2

Rheem RTEX-13 Tankless Water Heater, Gray

$680.00
$289.00
 in stock
Amazon.com
as of April 19, 2024 9:08 pm
8.7
Overall Verdict: Reliable and Efficient
The Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater is a durable and efficient option for households with multiple occupants. It provides hot water quickly and has a sufficient flow rate. However, there may be potential issues with the gallons per minute control and finding replacement parts after 5 years of use.
Efficient and Compact
  • Durable – Lasted 5 years without any issues
  • Suitable for households with multiple occupants – Can handle the demand of 6 people showering, doing laundry, and dishes
  • Easy installation – No need for additional 240 lines
  • Provides hot water quickly – Takes just a few seconds to get hot water
  • Sufficient flow rate – Can deliver hot water at a rate of 1-1.5 GPM
Inefficient Performance
  • Potential issue with gallons per minute control
  • Difficulty finding replacement parts after 5 years of use

The Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater in Gray is a reliable and efficient choice for continuous hot water on demand. With its external adjustable digital thermostatic control and LED display, you can easily set and maintain your desired water temperature with impressive accuracy. The durable copper immersion heating elements ensure long-lasting performance, and the self-modulating power control allows for efficient energy usage. Installation is simple with the included 1/2 NPT adapters, making it a convenient option for single point-of-use or multiple applications. Based on customer reviews, this water heater performs well even with high-demand usage, providing hot showers and water for everyday tasks like laundry and dishes.

Powerful and Compact
  • External adjustable digital thermostatic control with LED display
  • Durable Copper immersion two heating elements
  • Field serviceable
  • Self-modulating power control
  • Simple installation
  • 1/2 NPT adapters included
$289.00
$680.00
in stock
as of April 19, 2024 9:08 pm
Amazon.com
3

Rheem Tankless Electric Water Heater

$446.00  in stock
Amazon.com
as of April 19, 2024 9:08 pm
8.7
Great Value
The Rheem 18kW 240V Tankless Electric Water Heater is a compact and durable option that offers great energy savings with its adjustable temperature and long-lasting heat retention. While it may have limited capacity for simultaneous showers and some flickering lights when cycling, it provides excellent value for its affordable price.
Advantages
Drawbacks
  • Limited capacity for simultaneous showers
  • Flickering lights when cycling

The Rheem 18kW 240V Tankless Electric Water Heater is a sleek and compact unit that is perfect for mid-range whole-home applications. It provides a continuous supply of hot water, making it ideal for single shower applications in the Midwest. With its self-modulating technology, this water heater adjusts power to meet hot water demand, saving you up to 50 percent on your water heating bill. The durable copper immersion heating elements ensure long-lasting performance, and the external digital thermostatic control with LED display allows for easy temperature adjustments. This tankless water heater is not only space-saving and energy-efficient, but it also requires no venting.

Efficient and space-saving heating solution
  • External digital thermostatic control with LED display
  • Most advanced self-modulation
  • Durable Copper immersion two heating elements
  • Simple installation
$446.00
in stock
as of April 19, 2024 9:08 pm
Amazon.com
4

Rheem Tankless Electric Water Heater

$289.00  in stock
Amazon.com
as of April 19, 2024 9:08 pm
8.4
Final Verdict: Reliable with limitations
The Rheem 11kW 240V Tankless Electric Water Heater is an easy-to-use and efficient unit that provides consistent and continuous hot water with quick heating. However, some users have reported issues with cracked internal cases and clogging.
Efficient and Convenient
  • Easy to use controls
  • Provides consistent and continuous hot water
  • Quick heating of water
Disadvantages
  • Cracked internal case
  • Clogging issues

The Rheem 11kW 240V Tankless Electric Water Heater is a sleek and compact unit that provides a continuous supply of hot water for your point-of-use applications. With its 11kW model flow rate of up to 2.68 GPM, it can easily keep up with demand, making it perfect for a single shower. The ON/OFF dial control and adjustable digital temperature display make it easy to use, while the self-modulating power control ensures efficient energy usage. Although there have been a few minor issues reported, overall, customers have found this water heater to be reliable and effective in delivering hot water quickly.

Efficient, Eco-Friendly Heating Solution
  • ON/OFF Dial Control with adjustable digital temperature display
  • Self-modulating power control
  • 11kW Model Flow Rate: up to 2.68 GPM
  • Side 1/2″ NPT water connections
  • On demand, consistent and continuous hot water
$289.00
in stock
as of April 19, 2024 9:08 pm
Amazon.com
5

Rheem RTEX-24 Electric Tankless Water Heater

$606.99  in stock
Amazon.com
as of April 19, 2024 9:08 pm
8.4
The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater is a space-saving and energy-efficient option that provides a continuous supply of hot water with easy installation. However, it does not provide hot water during power outages and requires a specific electrical setup for installation.
Efficient and Cost-effective
  • Space-saving design
  • Continuous supply of hot water
  • Energy-efficient, resulting in lower electricity bills
  • Easy installation
Limitations
  • No hot water during power outages
  • Requires specific electrical setup for installation

The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater is the ideal choice for whole-home applications. With its sleek and compact size, it saves space and can be placed wherever you want, including under a sink. This tankless water heater offers a continuous supply of hot water, ensuring that you never run out. The self-modulating technology helps save up to 50 percent on your water heating bill, making it an energy-efficient option. Customers have raved about the ease of installation and the fact that they never run out of hot water. Say goodbye to cold showers and hello to a consistent and continuous flow of hot water with the Rheem RTEX-24.

Efficient and reliable hot water
  • ON/OFF Dial Control with adjustable digital temperature display
  • Self-modulating power control
  • 24kW Model Flow Rate: up to 5.9 GPM for RTEX-24
  • Bottom 3/4″ NPT water connections
  • On demand, consistent and continuous hot water
6

Rheem 8kW Tankless Electric Water Heater

$240.11  in stock
Amazon.com
as of April 19, 2024 9:08 pm
7.8
Verdict: Reliable and efficient
The Rheem 8kW 240V Tankless Electric Water Heater is a compact and energy-efficient option that provides quick and continuous hot water. It's easy to install and has adjustable temperature settings, although there may be some issues with the documentation and it may not be suitable for showers and larger sinks.
Efficient and Reliable
Drawbacks
  • Incorrect documentation regarding compression fittings
  • Limited capacity for handling showers and larger sinks

The Rheem 8kW 240V Tankless Electric Water Heater is perfect for point-of-use applications, offering a continuous supply of hot water. Its compact size allows for easy installation under a sink, saving space in your home. With its self-modulating power control and adjustable digital temperature display, you can easily control the water temperature to your preference. The 8kW model provides a flow rate of up to 1.95 gallons per minute, making it suitable for single or multiple point-of-use applications. Plus, this tankless electric water heater saves energy and money by only drawing energy when hot water is flowing.

Efficient and Compact Solution
  • ON/OFF Dial Control with adjustable digital temperature display
  • Self-modulating power control
  • 8kW Model Flow Rate: up to 1.95 GPM
  • Side 1/2″ NPT water connections
  • On demand; continuous hot water
$240.11
in stock
as of April 19, 2024 9:08 pm
Amazon.com
7

Rheem 6kW Tankless Electric Water Heater

$193.99  in stock
Amazon.com
as of April 19, 2024 9:08 pm
7.1
Inadequate for showers
The Rheem 6kW 240V Point of Use Tankless Electric Water Heater is a compact and easy-to-install option that provides consistent and continuous hot water for 1 or 2 sinks. It may not be suitable for shower use, as the temperature is flow-based, and the power button may be unresponsive until water is flowing through.
Efficient and Compact
  • Compact size
  • Suitable for single sink use
  • Easy to install
Limitations
  • Not ideal for shower use due to temperature based on flow
  • Power button may be unresponsive until water is flowing through

The Rheem 6kW 240V Point of Use Tankless Electric Water Heater is the perfect solution for providing hot water on demand for a single sink or two sinks in your home. This compact unit saves space and requires no venting, making it easy to install anywhere, even under a sink. With its push-button ON/OFF control and LED temperature display, you can easily adjust and monitor the water temperature. While it may not be ideal for shower use due to temperature limitations based on flow, it provides a continuous supply of hot water for your daily needs. However, it's important to note that some users have experienced issues with the power button, which requires hot water to flow through before it turns on the display. Overall, this tankless electric water heater offers convenience, energy efficiency, and reliability for your point-of-use hot water needs.

Efficient and Compact Design
  • Push-button ON/OFF control with LED temperature display
  • 6 kW Model Flow Rate: up to 1.0 GPM
  • Perfect for 1 or 2 sinks
  • Bottom 1/2″ NPT water connections
  • On demand, consistent and continuous hot water
$193.99
in stock
as of April 19, 2024 9:08 pm
Amazon.com
8

Rheem 3.5kW Point of Use Water Heater

$189.74  in stock
Amazon.com
as of April 19, 2024 9:08 pm
6
Overall Verdict: Decent with limitations
The Rheem 3.5kW 120V Point of Use Tankless Electric Water Heater is a small and stylish water heater that is easy to install and can be used as a backup. However, it is slow to heat water and the assembly instructions can be confusing.
Efficient Hot Water
  • Small and compact design
  • Easy installation process
  • Can be used as a backup water heater
Drawbacks
  • Slow to heat water
  • Confusing assembly instructions

The Rheem 3.5kW 120V Point of Use Tankless Electric Water Heater is a compact and stylish unit that provides a continuous and endless supply of hot water for low flow point-of-use applications. It is perfect for situations where space is limited, such as under a sink. With its digital temperature control, you can easily adjust the temperature in increments of 1°F, ranging from 80°F to 140°F. While some reviewers have mentioned a longer wait time for warm water, it's important to consider factors such as flow rate and distance when installing the unit. Overall, this tankless electric water heater is a cost-effective and energy-efficient solution that doesn't require venting.

Explore further:  Top 8 Hot Water Heaters for Hard Water: The Ultimate Guide
Efficient and Convenient
  • Compact and stylish design
  • Digital temperature control in increments of 1°F
  • Output temperature display (RTEX04 and RTEX06 models)
  • Non thermostatically controlled (RTEX04 and RTEX06 models)
$189.74
in stock
as of April 19, 2024 9:08 pm
Amazon.com

Explore Other Options

Frequently Asked Questions about the Best Rheem Tankless Water Heaters

What are the advantages of choosing a Rheem tankless water heater over a traditional water heater?

Well, there are several advantages to choosing a Rheem tankless water heater over a traditional water heater. Let me walk you through them.

Firstly, one major advantage is energy efficiency. Tankless water heaters only heat water when you need it, unlike traditional water heaters that constantly keep a tank of water hot. This means you can save on energy costs since you're not heating water when you don't need it. Rheem tankless water heaters are designed with advanced technology to provide energy savings and reduce your utility bills.

Secondly, space-saving is another benefit. Traditional water heaters can take up a significant amount of space in your home due to their large tanks. On the other hand, Rheem tankless water heaters are compact and can be mounted on walls or installed in smaller spaces. This frees up valuable floor space and allows for more flexibility in terms of installation.

Moreover, Rheem tankless water heaters offer an endless supply of hot water. Traditional water heaters can run out of hot water if multiple people are using it simultaneously or if you have high-demand activities like running a dishwasher or washing machine. With a Rheem tankless water heater, you won't have to worry about running out of hot water. It heats the water on-demand, providing a continuous supply as long as you need it.

Additionally, Rheem tankless water heaters have a longer lifespan compared to traditional water heaters. Traditional water heaters typically last around 10-15 years, while Rheem tankless water heaters can last up to 20 years or more with proper maintenance. This can save you money in the long run since you won't have to replace your water heater as frequently.

Lastly, Rheem tankless water heaters are known for their reliability and performance. They are built with high-quality materials and are backed by Rheem's reputation as a trusted manufacturer. You can have peace of mind knowing that your tankless water heater will consistently deliver hot water when you need it.

In summary, the advantages of choosing a Rheem tankless water heater over a traditional water heater include energy efficiency, space-saving, endless hot water supply, longer lifespan, and reliable performance. It's a smart choice for those looking to save on energy costs, maximize space, and enjoy a consistent supply of hot water.

How easy is it to install a Rheem tankless water heater? Can I do it myself or should I hire a professional?

Installing a Rheem tankless water heater can be relatively easy if you have some basic plumbing skills and experience. However, I would recommend hiring a professional if you're not familiar with plumbing or if you want to ensure the installation is done correctly.

Tankless water heaters require specific electrical and plumbing connections, and it's important to follow the manufacturer's instructions carefully. A professional plumber or HVAC technician will have the expertise and knowledge to handle the installation process efficiently and safely.

Additionally, hiring a professional ensures that the installation meets local building codes and regulations. This is crucial for the warranty of the water heater, as improper installation can void the warranty.

While it may be tempting to save money by doing the installation yourself, it's important to consider the potential risks and complications that can arise from improper installation. A professional can provide peace of mind and ensure the water heater operates safely and efficiently.

So, if you're not confident in your plumbing skills or want to guarantee a proper installation, I would recommend hiring a professional to install your Rheem tankless water heater.

Steve Donaldson Master HVAC technician
Steve DonaldsonMaster HVAC technician at Quality Comfort Home Services

I am Steve Donaldson, a Master HVAC technician with a rich background in addressing heating issues, especially when it comes to various types of water heaters. Leveraging my extensive expertise, I offer insights and advice to help individuals maintain a warm and secure home environment. Reach out to me at steve.donaldson@tedreviews.com for valuable tips from a seasoned professional in the industry.

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10 Comments
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  1. I would also suggest including the Rheem ECOH200DVLN-2 Performance Platinum Natural Gas Tankless Water Heater. It has a high flow rate and energy-efficient design.

  2. For those looking for a more budget-friendly option, the Rheem 3.5kW Point of Use Water Heater is worth considering. It’s great for providing hot water at a single point of use, like a bathroom sink.

  3. Can you please let us know when this article was last updated? I want to make sure the information is current.

  4. I would suggest adding the Rheem Performance Platinum 9.5 GPM Natural Gas High Efficiency Indoor Tankless Water Heater to the list. It’s a great option for larger households and provides excellent performance.

    • Thank you for your suggestion! We’ll definitely consider adding the Rheem Performance Platinum 9.5 GPM Natural Gas High Efficiency Indoor Tankless Water Heater to our list.

  5. I highly recommend the Rheem RTEX-13 Tankless Water Heater. It’s compact, energy-efficient, and provides hot water on demand. Perfect for small apartments!

  6. My favorite product from the list is the Rheem RTEX-27 Tankless Water Heater. I have been using it for a few months now and it has been fantastic. It provides a consistent flow of hot water and the temperature control is very accurate.

    • Thank you for sharing your favorite product! We’re glad to hear that you’re enjoying the Rheem RTEX-27 Tankless Water Heater.

  7. I disagree with the rankings. I have the Rheem 8kW Tankless Electric Water Heater and it hasn’t been performing as well as expected. I would place it lower on the list.

    • We appreciate your feedback and differing opinion. It’s important to note that individual experiences may vary. We included the Rheem 8kW Tankless Electric Water Heater based on its overall performance and customer reviews.

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