Rheem Tankless Water Heater Reviews

With decades of experience under their belt, Rheem has grown into one of the most significant heating and cooling systems companies in the world, serving close to 20 different countries spread across different continents. With over 100 years of operation, Rheem has dabbled in various ventures until they settled on their true calling of providing the world with some of the best HVAC systems there is. They are now one of the most recognizable brands in the heating and cooling industry.

Rheem tankless water heater is a brand that represents safety and resource-saving. Forget your fear of overheating or freezing to death due to malfunction; those days are gone should you go with one of Rheem’s products. Comfort comes as a guarantee. It is fantastic how much space, money, and water you can save when you resort to the right professionals and equipment.


Top Rated Rheem Tankless Water Heaters

It is quite hard to pick the best Rheem water heaters out of hundreds of products that are of the highest quality. However, there are a few standout models that will give you a test of what the Rheem brand is all about.


1. Rheem RTGH-95DVLN

Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater

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This 82-pound water heater has all the unique features Rheem is known for. AHRI lists it as a third-party efficiency guaranteeing you 94% energy efficiency. The condensing heat exchanger is made of stainless steel. It comes with a two-pipe vent system compatible with up to 5 feet of 2-inch PVCs or 38 feet of 3-inch PVCs. It has a built-in electric blower, and an overheat film wrap in case the heat exchanger gets too heated.

This Rheem Indoor heater comes with a sophisticated digital display for comfortable temperature control and seamless input of the maintenance codes.


  • 94% energy efficiency
  • It is a low NOx model making it very eco-friendly
  • Suitable for high altitudes as it can handle up to 9,840 feet above sea level
  • It has remote control


  •  Takes a little longer for the water to heat up
  • The installation has to be done by a professional hence the extra cost


2. Rheem RTG-84XLP

Rheem RTG-84DVP Low Nox Direct Vent Tankless Water Heater Liquid Propane Energy Star 8.4 GPM

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The Rheem RTG is an outdoor propane model perfect for all your home hot water needs. Depending on your temperature setting, you will get up to 8.4 gallons of hot water per minute. It has a great flow rate and 10 feet of thermostat wire and you can remote control it. Its design is compact making the installation process cheap and seamless.


  • It is an outdoor model hence you will save a lot of space
  • It is a low NOx version making it eco-friendly
  • It is lightweight weighing only 54 pounds


  • Requires a relatively vast amount of gas pressure to work properly
  • In infrequent occasions, it may get a little noisy


3. Rheem RTEX-18

Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray

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If there is one thing the RTEX proves is that size doesn’t matter. Don’t let this 8.5-pound piece of equipment fool you. It is enough to keep hot water running through your pipes for days nonstop. It is one of the most advanced Rheem models, and you can easily adjust the temperature to meet your needs. The thermostatic control is found on the outside. It has a digital display for you to select the desired temperature accurately.


  • It is small and lightweight
  • Advanced thermostat control makes it easy to set the temperature you prefer
  • Very easy to install and maintain
  • Threading makes it easy to replace individual components


  • It works on a relatively smaller scale. It cannot heat multiple showers like its larger counterparts


Types of Rheem Tankless Water Heaters

Rheem RTG-95XLP 9.5 GPM Outdoor Tankless Propane Water Heater Low NOx

Rheem products are diverse enough to cover all kinds of heating requirements, both residential or commercial. There is something for everyone from those who prefer the old school ways of a tank-type structure with natural gas or propane to those who are comfortable with the new and improved tankless electrical versions.

1. Rheem Natural Gas Tankless Water Heater

Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater Natural gas powers some of Rheem’s tankless water heaters. Even though there is a misconception that electric heaters are better, it’s all a matter of circumstances and preferences. There are situations where natural gas-based tankless water heaters can outperform their electric counterparts.


It is pretty clear that natural gas tankless heaters are ideal for large households. They have the power to ensure that a 5-bedroom condo or larger has enough hot water supply for laundry, dishes, and showers.

Natural gas systems are exceptional in adverse weather conditions. Millions of users in cold areas can testify to the fact that the system produces top-notch results regardless. These systems do not succumb to pressure or temperature drops.

Natural gas heating systems are just as energy efficient as the electric models. Rheem models have a particular condensing unit that extracts the heat out of the exhausted gas, thus improving the overall energy efficiency. While other brands tap out at 82% efficiency, Rheem models go as high as 94% thanks to the state-of-the-art condensing unit.

With no hot air exiting the Rheem natural gas systems, venting becomes way easier. There is no need for heat-resistant materials as even the cheapest venting materials can do. The in-built electric bowler makes venting even more efficient, and that’s something most brands lack, but not Rheem though.

Even though most people mistake natural gas systems to be rugged and analog, Rheem models are as smart as they come. You can control them remotely and get access to tons of other intelligent features. As for ruggedness, they’re not that soft either. They are fit for industrial purposes too. You can pair them up and use them for some of the most exhaustive industrial functions or operations.

All Rheem natural gas tankless water heater models are low NOx. Their emission levels are so reduced that they can easily match electric models when it comes to eco-friendliness.

It’s hard to find any drawbacks when it comes to the natural gas system’s functionality. Any mishap is barely circumstantial or based on scale. For example, small households will find this magnificent beast overkill. It packs too much power, and on top of that, the price tag is not for the weary at heart or pocket. The Rheem gas models are quite pricey compared to other models due to their slightly higher-than-usual complexity.


2. Rheem Propane Tankless Water Heater

Rheem RTG-64DVLP Prestige Low NOx Indoor Direct Vent Condensing Tankless Propane Water Heater

Propane is as popular as natural gas when it comes to home heating systems. While people get natural gas through pipelines from the provider, propane comes in liquid form packed in cylinders giving propane an upper hand as far as accessibility and flexibility go. In an area where there is no proper natural gas provider, or there is no stable pipeline access, propane supply is the next best thing.

There is wide speculation that natural gas is way cheaper than propane but one thing that is indisputable is the BTU. Propane’s BTU is close to double that of natural gas. That simply means that propane is way more efficient when it comes to heating. Either way, choice of fuel depends on your living conditions.

When it comes to general performance, propane and natural gas systems pretty much go hand in hand. You can be sure of four simultaneous hot showers even if you still need some water for dishwashing and laundry. Its energy efficiency is also high without compromising on environmental consciousness. Rheem propane systems are low NOx models that condense their fumes. As a result, ventilation requires very little energy.

What’s more, the propane system is packed with smart features, and you can control it remotely. With a reliable propane supplier, its portability can be your biggest blessing. There are also numerous other home appliances that use propane, therefore, helping you kill multiple birds with one stone. Even though the dent in your pocket will be quite sizable, the whole experience will be worthwhile especially with the high quality that Rheem is known for.

Besides, during the refilling of your propane tanks by your provider, you may get a professional opinion on your energy consumption occasionally.


3. Rheem Electric Tankless Water Heater

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

For the modern man with lesser energy consumption and no space for pipelines and propane tanks, electric heating systems work just fine. Rheem electric tankless water heaters are way cheaper to install and maintain than gas systems. They are also relatively smaller and can fit in many modern households with up to four bedrooms or less. Even individual homeowners can have their own electric tankless systems for their dishwashers, laundry and shower needs.

Maintaining the system is as easy as cleaning the inlet screen filter every now and again. That is something that you can do during the weekends or once every month. There are no ventilation ducts or gas pipes to cause you any form of worry.

Being a smaller system with fewer features, their energy efficiency is very high. There are no harmful fumes to emit. They easily guarantee a 98% efficiency rate.

Electricity is available in most parts of the world as opposed to propane and natural gas whose availability relies on a number of factors. Granted, the electricity supply has to be stable since they consume lots of it compared to other regular home appliances. Even their highest consumption rate is nothing compared to gas systems hence they are the best options as far as general energy consumption is in question.

You can easily incorporate electric tankless water heaters in your business premises. All you need is a few components and a Rheem expert. As long as your electrical service can supply 240 volts, you have enough power to enjoy your electric heating system comfortably.

Electric water heating systems dispense between 3 and 8 gallons of hot water every passing minute based on the installed model. That may not be ideal for a large family, but it’s perfect for an individual or couple. It is also suitable for people with low water heating needs, especially in an office.


Rheem Tankless Water Heater Features

Rheem tankless water heaters are popular because they come with an endless number of features. There is something for everyone. They are tailored to cater for all types of water heating needs. Some features are standard across the board. There are also functionalities that most people pay keen interest to and Rheem makes sure they get what they deserve.

  • Save Money

Rheem tankless water heaters are very kind to your pockets. You will get a state-of-the-art installment for a price that will leave a smile on your face. You will also spend very little on operation and maintenance saving you an upwards of $1,100 in a span of 12 years.

  • Reduced Installation Time and Money

The hardest part of any HVAC system is the installation. Rheem systems come with gas lines that are compatible with all models hence saving you the hustle of struggling with compatibility issues. Rheem models come with condensing units and cheap venting materials made of PVC so that you don’t spend too much time and money on the ventilation process.

  • Save Space and Water

Modern homes and apartments do not have space for large propane tanks dug underground or pipelines running for miles on end. Rheem tankless systems are compact leaving you with plenty of living space. Outdoor models ensure that you don’t have to mess with your indoor arrangement or space.

You can also say goodbye to high water bills as you will conserve 12,000 gallons annually thanks to the Recirculation pump.

  • Personal and Home Protections

All the necessary protective measures are put in place. As soon as the heat exchanger overheats, the Overheat Film Wrap shuts it down so that your precious home doesn’t burn down or fall victim to serious electrical complications.

The EcoNet feature is the icing on the cake. EcoNet is a smart monitoring system that comes complete with a mobile app to take your safety to a whole new level. You can troubleshoot your heating system and find the right remedy in a matter of minutes. EcoNet’s sensors can detect leaks and notify you immediately after taking the best countermeasure. You will also get regular reminders when it’s time for maintenance.



[expand title=”How much can I expect to save on my monthly bill?”]

According to test results, using a Rheem gas tankless water heater will save you 40% of what it takes to run an electric water heater. If you were using a natural gas water heater, the Rheem installation would save you up to 30%.[/expand]

[expand title=”Where in my home can I install a Rheem tankless water heater?”]

There are two ways to install a Rheem tankless water heater; it can either be outdoors or indoors. The indoor models are conducive for any room even your bathroom or bedroom as long as they can access combustion air from outside and have proper venting. Other models are for outdoor fitting only, and they do not require any venting installations.[/expand]

[expand title=”Can it be installed in the same place my old water heater was installed?”]

It is possible as long as it can access combustion air from outdoors. New Rheem models can fit even in locations that other regular water heaters cannot. Even if you want it in the garage, the Digital Temperature Controller can be mounted in a place that you frequent.[/expand]

[expand title=”Can I convert Rheem tankless water heater from propane to natural gas?”]

It’s not possible to convert your tankless water heater from one fossil fuel to the other.[/expand]

[expand title=”What safety device is used to prevent overheat failure of the heat exchanger?”]

The Overheat Film Wrap is an exclusive feature found in all Rheem products. It covers the whole heat exchanger, and as soon as the maximum safe temperature is exceeded, the film wrap will shut down the heat exchanger.[/expand]


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