6 Best Rheem Water Heaters in 2021 – Reviews and Buyer’s Guide

Are you looking to buy a quality water heater for your home or apartment? If you’ve been on the hunt, I’m sure you may have come across Rheem water heaters more than once — and for all the good reasons.
Rheem is a leading water heater company based in the United States. Since decades, their water heaters have been one of the highest selling products not only in the United States but all over the world.
What makes their water heaters so much in demand?
In this article, we’ll put six of the best Rheem water heaters under the microscope to find out the good and potentially bad features of each model.
So, let’s dive into it!
Rheem RTG-84XLN-1 Tankless Water Heater

Since Rheem is one of the leading companies that manufacture water heaters, there are tons of high-quality products you can choose for your home. Among all the products listed in this article, we rank RTG-84XLN-1 as the top Rheem water heater available in the market.
The RTG-84XLN-1 is a premium water heating unit that is capable of delivering 8.4 gallons of hot water every minute. With such a high flow rate, it can deliver hot water in multiple sinks and showers simultaneously. This model is perfect for outdoor uses as it has a freeze protection rate up to -30 degrees.
Quick Summary of Best Rheem Water Heaters
Product Image | Product Name | |
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Top Pick for Overall Performance
Rheem RTG-84XLN-1 Tankless Water Heater
Rheem RTG-84XLN-1 is the most premium water heating system by Rheem. This model is highly efficient and can deliver up to 8.4 gallons of hot water every minute. Also, this unit is relatively inexpensive and features exclusive water-saving technology. |
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Water Heater with High Flow Rate
Rheem RTGH-95DVLN Tankless Natural Gas Water Heater
Rheem RTGH-95DVL is a natural gas water heater designed to deliver an endless supply of hot water at your home. With a capacity of 9.5 GPM, this is one of the most efficient water heaters by Rheem. Additionally, this system is backed by a 12-year warranty on the heating elements. |
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Excellent Choice for On-Demand Water Heating
Rheem RTEX-24 Residential Tankless Water Heater
Rheem RTEX-24 is made of durable copper immersion heating elements along with brass top. It features self-modulating technology that automatically adjusts the water temperature as per your need. Also, it includes an Overheat Film Wrap (OFW) that protects the heat exchanger for longevity. |
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Lightweight and Compact Tankless Water Heater
Rheem RTEX-13 Residential Tankless Water Heater
High quality and energy-efficient, Rheem RTEX-13 is a residential water heating system that delivers hot water exactly when you need it. This model is equipped with an adjustable thermostat control that makes it effortless to control the water temperature. |
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Top Pick for Energy Efficiency
Rheem RTEX-18 Residential Tankless Water Heater
Rheem RTEX-18 is a highly functional inline water heater that delivers endless hot water enough for a medium household. This model is also compact, lightweight, and portable. Therefore it is an excellent water heating system for mobile homes, RVs, travel trailers, and campers. |
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Budget-Friendly Tankless Water Heater
Rheem RTEX-08 Residential Tankless Water Heater
Rheem RTEX-08 is an effective water heater that comes at a reasonable price. It is an excellent point-of-use application that is 99.8% energy-efficient and delivers instant hot water when required. |
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Best Rheem Water Heaters of 2021 - Reviewed
Rheem RTG-84XLN-1 Tankless Water Heater
Features Highlights
- Exclusive Water Saving Technology
- Can save up to 1,100 gallons per year
- Features Hot Start Programming that reduces cold water burst
- Comes with a recirculation pump ready kit
- Ideal for outdoors purpose with freeze protection rate of -30 degrees
Product Specification
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Dimensions:
8.9 x 13.9 x 23.6 inches
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Weight:
54 pounds
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Material:
Stainless Steel
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Flow Rate:
8.4 gallons per minute (GPM)
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Voltage:
120 volts
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Warranty:
12 Years Warranty
Rheem RTG-84XLN-1 offers a high water flow rate with 8.4 gallons per minute (GPM). This is sufficient to deliver hot water in multiple sinks and shower simultaneously. With freeze protection rate up to -30 degrees, this model is an excellent water heater for outdoor use.
Performance
While there are certain similarities between RTG-84XLN-1 and other Rheem models, their significant difference lies in the pump emissions. The RTG-84XLN-1 is a super-efficient methane unit that comes with a unique ‘low NOx’ function. This feature eliminates the need for complex venting systems.
However, this system needs to be installed outside the house. If you install it in an enclosed space, the trapped air can cause the fumes to build up, which can pose a great risk to health.
Heat Output and Flow
Rheem RTG-84XLN-1 can deliver a maximum flow rate of 8.4 GPM. However, the exact flow rate will highly depend on how cold the incoming water is. With this system, you can adjust the temperature with a remote controller to get the hot water as you desire.
Easy Installation
It is always better to have a trained technician to install water heaters at your home, especially when switching from a traditional tank to keep the warranty intact.
However, if you insist on installing the system by yourself, the steps are extremely simple. Rheem has also included a detailed instruction manual that guides you through the entire installation process.
Here are a few supplies you need to grab before you start installing the system:
- Ground lines
- High altitude chip
- Circuit breakers
- Pressure relief valve
- Weather-proofing materials
Pros
- Low NOx helps to reduce harmful emissions
- Can serve multiple showers and sinks simultaneously
- Can save up to 1,100 gallons of water every year
- Comes with a 12-years warranty
Cons
- Must be installed outdoors
Our Verdict
If you’re looking for a high-quality Rheem outdoor water heater at an affordable price, Rheem RTG-84XLN-1 is your best bet. This system is made up of sturdy stainless steel material and can deliver up to 8.4 gallons of water every minute. Additionally, this unit is backed by a 12-years warranty.
Rheem RTGH-95DVLN Tankless Natural Gas Water Heater
Features Highlights
- High-quality water heater with EcoNet Smart Home Technology
- 94% energy efficient
- Its condensing heat exchanger is made up of stainless-steel material
- Features intelligent electronic controls for safety and efficiency
- Low NOx solutions
- Built-in Condensate Neutralizer
- Energy Star rated
Product Specification
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Dimensions:
18.5 x 9.8 x 27.5 inches
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Weight:
79 pounds
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Material:
Stainless Steel
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Flow Rate:
9.5 gallons per minute (GPM)
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Voltage:
120 volts
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Warranty:
12 Years Warranty
Rheem RTGH-95DVL is a tankless water heater that is capable of delivering hot water in multiple kitchens and bathrooms simultaneously. It uses condensing technology, which makes it the most efficient whole-house water heating system at up to .93 UEF.
Advanced Technology
This tankless water heater by Rheem features hot-start programming that helps to reduce fluctuation in water temperature. This unit also has an Overheat Film Wrap (OFW) to protect the breaching of the heat exchanger.
If one tankless water heater is not sufficient for your household, the EZ-Link Cable technology allows you to connect two systems to operate as one. In addition, this unit is a low NOx model, which significantly reduces harmful emissions.
Venting and Self-Diagnostic
System Most water heaters require outdoor space for venting. However, the venting of Rheem RTGH-95DVL can be installed both indoors as well as outdoors as per your preference.
Additionally, this system is equipped with a self-diagnostic system that constantly checks the heater’s functions. In case the system finds any issues within the unit, the system will automatically warn you. Therefore, this additional feature adds to the safety of the water heater by preventing accidents.
High Flow Rate
One outstanding feature of all the Rheem water heaters is its high flow rate. This water heater delivers up to 9.5 gallons of water, which is more than enough to heat three full-flow showers at once. With such a flow rate, this water heater will guarantee that you never run out of hot water, even if you have three or more bathrooms at your home.
Energy-Efficient
Rheem RTGH-95DVLN is an efficient water heating system that is approved by Energy Star. With a 0.94 energy factor, this water heater by Rheem is energy-efficient and helps to reduce the utility costs. Additionally, Rheem RTGH-95DVLN is a condensing unit that extracts heat from exhaust gases, making this model more energy-efficient compared to non-condensing systems.
Pros
- High flow rate
- 94% energy efficiency rating
- Safety features and easy-to-use controls
- Can be installed both indoor and outdoor
- Constructed to deal with freezing temperatures
Cons
- It is slightly expensive
- This unit can be overabundant for smaller household
Our Verdict
If you’re opting for a premium water heater with a massive flow rate, you should definitely consider buying Rheem RTGH-95DVL. This appliance offers an excellent flow rate of 9.5 gallons per minute. Additionally, this unit consumes less energy and is equipped with self-diagnostic technology.
Rheem RTEX-24 Residential Tankless Water Heater
Features Highlights
- Digital thermostatic control with LED display
- Advanced self-modulation technology
- Built with copper immersion three heating elements
- Easy installation
Product Specification
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Dimensions:
4 x 18 x 19 inches
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Weight:
17.8 pounds
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Material:
Copper Immersion
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Flow Rate:
5.9 gallons per minute (GPM)
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Voltage:
240 volts
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Warranty:
5 Year Limited Warranty
Rheem RTEX-24 is capable of delivering a continuous supply of hot water for both single point of use and even for multiple applications. With a sleek design and high efficiency, this unit provides top-notch performances, even for multi-user households.
Unlimited Hot Water Supply
Rheem RTEX-24 is a super-efficient water heater that is capable of delivering an unlimited supply of hot water at your home. It is equipped with self-modulating technology that ensures you get the water with the right temperature. Also, you can manually adjust the temperature according to the number of outlets at your home. Consequently, the system is ideal for both small as well as large households.
Easy Installation
Installing a water heating system can get complicated at times. However, you no longer have to worry about that with Rheem RTEX-24. Although it may take a little time to install this system, the entire installation process is extremely easy. All you have to do is follow the step-by-step installation manual that comes with the unit. However, you may require a few tools and materials to install the system.
Space Saving
Another advantage of investing in Rheem RTEX-24 is its size. The compact design of this water heating system makes it a perfect match for homes with space issues. With a stylish and sleek design, this water heater can virtually be installed anywhere and requires a small space.
Heat Output and Flow
Rheem RTEX-24 is equipped with thermostatic controls with an LED display. This advanced technology observes the flow of the water and temperature to determine the necessary amount of heat to deliver the required output. Also, the high-tech mechanism of RTEX-24 does not allow the temperature to change, even when the flow of water changes. Along with that, this model offers a flow rate of up to 5.9 gallons per minute.
Quality
Just like other Rheem water heaters, RTEX-24 is built using high-quality materials. It is constructed with a sturdy copper immersion heating element that can serve for a long time without any damage or corrosion. On top of that, the manufacturer provides a 5-years warranty on this product to ensure reliability and durability.
Saves Money
Compared to other Rheem water heating systems, this system offers great value for money. It is relatively cheaper and performs for an extended period of time. Also, you can save the entire installation cost as you do not need a technician to install the system.
Pros
- Unlimited supply of hot water
- Easy to install and operate
- Inexpensive and affordable
- Advanced self-modulation technology
- Durable copper immersion heating element
- Digital thermostatic control with LED display
Cons
- Additional installation cost
- Can consume a lot of energy during winter
Our Verdict
If you’re one of those looking for a compact unit that fits in a small space, you should consider buying Rheem RTEX-24. It is equipped with digital thermostatic control with an LED display and features a self-modulating mechanism. Although inexpensive, this unit is made out of high-quality materials that last for years to come.
Rheem RTEX-13 Residential Tankless Water Heater
Features Highlights
- Adjustable thermostatic control with LED display
- Sturdy copper immersion two heating elements
- Equipped with self-modulating power control
- Easy installation
- 99.8% energy-efficient
Product Specification
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Dimensions:
4 x 9 x 13 inches
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Weight:
4 pounds
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Material:
Copper Immersion
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Flow Rate:
3.17 gallons per minute (GPM)
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Voltage:
240 volts
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Warranty:
5 Year Limited Warranty
Rheem RTEX-13 is equipped with adjustable thermostat control that adjusts water temperature as per your need. This model does not have a built-in tank, which means you no longer have to worry about water leakages and bursts. Additionally, this unit is 99.8% energy-efficient.
Energy-Efficient
Rheem RTEX-13 is an energy-efficient water heating system that is capable of saving up to 99.8% energy. So, with this system, you can cut down your daily energy consumption and save on utility bills.
On-Demand Hot Water
This is an on-demand water heater that is directly connected to your mainline and heats water only when you need it. This means you no longer have to worry about leakage and water bursts like conventional tank water heaters. Also, as this system only operates when you need it, it is a much safer option and saves a lot of money by consuming less energy.
Easy Installation
At times, installing a water heater by yourself can be troublesome. However, with Rheem RTEX-13, you don’t have to worry about the installation process. The installation is extremely easy, and it comes with all the necessary tools and equipment required to install the system. The manufacturers also provide the installation manual to guide you through the installation.
Lightweight and Compact
This tankless water heater is compact and lightweight. Weighing only 4 pounds, this unit is easily movable from one place to another, making it ideal for people who tend to move frequently. Also, the compact size of this unit saves a lot of home space. Therefore, this system is ideal for smaller homes and apartments.
Pros
- High-quality on-demand water heater
- Durable copper immersion heating elements
- Compact and Lightweight
- Easy to install
- 99.8% energy-efficient
- Powered by self-modulating power control
Cons
- Not ideal for cold climates
- Requires a 60-AMP breaker box
Our Verdict
Rheem RTEX-13 is a high performing on-demand water heating system that is equipped with self-modulating power control. This model is 99.8% energy-efficient and includes durable copper immersion heating elements. If you are concerned about water tanks consuming a lot of space at your home, this tankless system is an excellent product for you.
Rheem RTEX-18 Residential Tankless Water Heater
Features Highlights
- Robust and durable copper immersion heating elements along with brass top
- Endless supply of hot water
- 99.8% energy efficient
- Effortless installation
- Digital temperature display
- External controls to adjust temperature
Product Specification
-
Dimensions:
4 x 15 x 19 inches
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Weight:
8.5 pounds
-
Material:
Copper Immersion
-
Flow Rate:
4.4 gallons per minute (GPM)
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Voltage:
240 volts
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Warranty:
5 Year Limited Warranty
Rheem RTEX-18 is an efficient indoor inline water heater that delivers instant and continuous hot water for single point-of-use as well as multiple applications. This model is ideal for a medium household with two to three bathrooms. Compact and portable, RTEX-18 is also perfect for mobile homes, RVs, travel trailers, and campers. The low profile design of this water heating system makes it fit perfectly under kitchen sinks and counters.
Energy-Efficient
Rheem RTEX-18 is an energy-efficient water heating system that is capable of saving up to 99.8% energy. This means, with this system, you can cut down your daily energy consumption and save on utility bills.
Durability
Unlike conventional tank-type heaters, this water heater does not have a water tank. So, you do not have to worry about the plague and corrosion buildup in the water tank. In addition, this water heating system is made out of robust copper immersion heating elements with brass top. With a high-quality built, this unit can last for more than a decade without a drop in performance.
Space-Saving
Most people do not prefer to buy a water heater as they tend to be bulky and take up too much space. If you’re looking for a compact-sized water heater for a small home or apartment, Rheem RTEX-18 certainly makes the perfect match. This tankless model is ideal for apartments with limited space, as this unit can virtually fit anywhere.
Safety
This water heating unit is much safer compared to traditional water heaters. Usually, traditional units tend to corrode over time, which often leads to structural damages. Once these heaters start to leak or burst, there is no way you can stop it. With RTEX-18, you do not have to worry about these issues. Even if the system malfunctions, you simply need to shut off the nearest valve to stop the leakage.
Endless Hot Water
Rheem RTEX-18 is a high performing water heater that delivers an unlimited supply of hot water at your apartment or home. This water heating system is powered by self-modulating technology that makes sure you get the water at the right temperature.
Pros
- Self-modulating unit
- Small and compact
- Adjusts the water temperature as per your desire
- Has copper immersion heating elements with brass top
- For a comfortable replacement, both the heating elements are threaded
- 99.8% energy efficient
- Includes digital display for easy reading
Cons
- Few complaints regarding fluctuation in the temperature
- Takes more than a second to heat the water
- Installation manual is printed wrong way
Our Verdict
You will definitely love this product by Rheem as it is capable of delivering an unlimited supply of hot water at your home. In addition to that, this system is 99.8% energy efficient, which means this unit significantly cuts down the power usage and thus, saves a lot of money.
Rheem RTEX-08 Residential Tankless Water Heater
Features Highlights
- Consistent and endless hot water supply
- Compact and stylish design with digital temperature control
- 99.8% energy-efficient
- Robust copper immersion heating elements with brass top
- Easy replacement and simple installation
- Digital temperature display
Product Specification
-
Dimensions:
4 x 9 x 13 inches
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Weight:
7 pounds
-
Material:
Copper Immersion
-
Flow Rate:
1.95 gallons per minute (GPM)
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Voltage:
240 volts
-
Warranty:
5 Years Limited Warranty
Rheem RTEX-08 is a perfect point-of-use water heating application that delivers hot water only when you need it. This model is compact and lightweight, making it ideal for outdoor installation. As this unit is 99.8% energy-efficient, it can also reduce your regular energy bills to a great extent.
Thermostatic Digital Control
Rheem RTEX-08 features an extraordinary control setup, which makes it convenient for you to control and monitor the system. Unlike ordinary digital display, the thermostatic digital display offers the most trouble-free and comfortable experience to the users. This feature makes it easy for you to adjust the water temperature as per your needs.
Energy Efficient
This tankless water heater has earned its popularity among buyers due to its efficiency to save energy and environment-friendly approach. Similar to other Rheem water heaters, this model is also 99.8% energy efficient. This means using this system can cut down power usage and also reduce your utility bills.
Instant Hot Water
One of the best features of this water heater is its ability to supply hot water within seconds. As this water heater does not include storage tanks, it is directly connected to the faucets. This system delivers hot water on-demand when you need it.
Simple Installation
Installing a water heater has never been as easy as it is with Rheem RTEX-08. Even for beginners, installing this heating system is extremely easy and quick. The manufacturer also provides all the necessary equipment that is required for a successful installation. For your convenience, the manufacturer also provides a user manual to guide you through the process.
Pros
- Compact-sized and lightweight
- Space-saving design
- 99.8% energy efficient
- Self-modulating heat exchanger
- Robust copper immersion heating elements with brass top
- Features a digital temperature control
Cons
- Not suitable for large families
- Although simple, the installation process requires additional wiring and pole breakers, which increases installation cost
Our Verdict
Rheem RTEX-08 is a cost-effective water heater that includes a modulating heat exchanger for efficient performance. Similar to other Rheem products, this model is also 99% energy effective and is effortless to use. In addition, this model is backed by a five years warranty for heating elements.
Comparison Table for Rheem Water Heaters
SN | Product Name | Dimensions (inches) | Weight (pounds) | Material | Flow Rate (GPM) | Voltage (Volts) | Warranty |
---|---|---|---|---|---|---|---|
1 | Rheem RTG-84XLN-1 Tankless Water Heater | 8.9 x 13.9 x 23.6 | 54 | Stainless Steel | 8.4 | 120 | 12 Years Warranty |
2 | Rheem RTGH-95DVLN Tankless Natural Gas Water Heater | 18.5 x 9.8 x 27.5 | 79 | Stainless Steel | 9.5 | 120 | 12 Years Warranty |
3 | Rheem RTEX-24 Residential Tankless Water Heater | 4 x 18 x 19 | 17.8 | Copper Immersion | 5.9 | 240 | 5 Year Limited Warranty |
4 | Rheem RTEX-13 Residential Tankless Water Heater | 4 x 9 x 13 | 4 | Copper Immersion | 3.17 | 240 | 5 Year Limited Warranty |
5 | Rheem RTEX-18 Residential Tankless Water Heater | 4 x 15 x 19 | 8.5 | Copper Immersion | 4.4 | 240 | 5 Year Limited Warranty |
6 | Rheem RTEX-08 Residential Tankless Water Heater | 4 x 9 x 13 | 7 | Copper Immersion | 1.95 | 240 | 5 Years Limited Warranty |
Why Choose A Rheem Water Heater?
With so many different brands selling the same product in the market, it is obvious that you think about this! Well, worry not! We are here to tell you exactly why you should choose Rheem over any other brands available in the market.
Rheem has been the industry-leading company for almost a century. With high-quality and super-efficient products, they have been one of the most recognized brands when it comes to water heaters.
One of the most significant things that separate Rheem water heaters from any other brands is its Zero Waste Initiative. Not only does this company manufacture high-quality products, but they also practice environmentally-friendly approach and design energy-efficient models.
Although they have faced plenty of challenges and competition from newer companies, Rheem’s evolving technologies and innovative advancements have always set them apart from others.
Whether you live in a small apartment or a large family home, with Rheem, you should be able to find the most suitable water heater for your home.
FAQs on Rheem Water Heaters
Choosing the right water heater depends on various factors. It is always better to determine the size of your family and the demand for hot water at your home in one continuous hour. Once you know the “Peak Hour Demand” of your home, go for the model that meets the demand.
Some Rheem models offer a lifetime warranty on their products. This is to ensure the quality and reliability of its products. However, the products listed in this article are backed by a 5 to 12 years limited warranty.
Yes, Rheem also has water heaters for commercial applications. Their products also include a full line of standing pilot, sealed combustion, direct vent, intermittent spark, and high-efficiency commercial water heaters. In addition, they have both electric models as well as gas models in commercial water heaters.
Yes, indeed. While installing the new water heater, you can add an extra kit and get an additional four-year tank leak warranty. This additional kit will fit in both residential gas as well as electric water heaters manufactured by Rheem.
Tankless water heaters by Rheem are the most reliable units for both lower elevations as well as high elevations. Without the storage tanks, the units are space-saving, cost-effective, and highly durable compared to tank-type water heaters.
Well, it depends on how you use it and how well you maintain it. All the water heaters manufactured by Rheem are constructed with robust and highly durable components. Additionally, Rheem products come with a minimum warranty period of five years and can extend to a lifetime warranty.
Sometimes, few reasons might lead the water heater to not stay lit which needs to be checked on regular basis.
Yes! All the water heaters manufactured by Rheem are certified under the Energy Star and are designed to conserve energy.
Well, that’s all regarding the best Rheem water heaters available in the market. To wrap things up, these water heaters are engineered to deliver instant and an endless supply of hot water, whether you use it at your home or the office. Regardless of which one of these models you choose to buy, they are all high-end units that guarantee high performance and continuous hot water supply. Cheers!
