Rheem is a leader in water heating systems. If you’re looking for insights into the top-rated Rheem water heaters on the market, you’ve come to the right place. Rheem is a highly recognizable name in water heating systems. In fact, they’re one of the top companies in America. Whether you’re looking for tankless, storage, or natural gas, our list covers the gamut of water heater options by the Rheem brand.
So what is the best Rheem Water Heater in 2021? Our pick is the Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater. We like its external adjustable digital thermostatic control and LED display. And we love the fact that it’s 99.8% energy efficient. Find out more about our number one choice below.
Here, we’ve researched and discovered the 8 top-rated Rheem water heaters on the market plus one to avoid.
Reviews of the 8 Best Rheem Water Heaters, Plus 1 to Avoid
1. Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater Review
The Rheem 240V Heating RTEX-13 Residential Tankless Water Heater is compact so it can be placed just about anywhere. It’s also sharp-looking, so if it’s out in the open it’s not an eyesore. It’s estimated that a tankless water heater like this model can save you around 30% on your electric bill each month. As you can see, these models more than pay for themselves.
This model is best for a small or medium house and probably won’t serve a large house or big family. Although some of these tankless water heaters can be a beast to install and require professional assistance, this model is generally understood to be on the simpler-side as far as installation goes.
All in all, we love this tankless water heater because of its great use of new technology, its compact design, and its simple installation. And the energy efficiency makes for a big improvement on your electric bill, which is a huge bonus. This particular unit is 99.8% energy efficient, which is one of the main reason it earns our top spot.
To watch the Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater Review on YouTube, click here.
- Adjustable thermostat control
- 99.8% energy efficient
- Easy installation
- Not suitable for big houses
- Best for point of use
2. Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater Review
This Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater has intelligent electronic controls to help maximize energy efficiency. It includes a stainless steel condensing heat exchanger and has a sleek, compact design. The handy digital display shows both temperature settings and maintenance codes.
Because this unit has a self-diagnostic system, it warns you ahead of time if anything is compromised or failing. This is a great feature for convenience and safety. The installation is fairly simple and the unit comes with very detailed instructions.
One particularly noteworthy feature is that this gas tankless water heater has high-altitude capability and freeze protection. So if you live in a cold climate or at a high elevation, this might be the tankless heater for you. Because it’s low nox (NOx) you can feel confident that you’re doing your part for the environment. High efficiency units like this one give you a cleaner burn and don’t waste fuel.
To watch the Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater Review on YouTube, click here.
- Stainless steel heat exchanger
- Low nox version
- 94% energy efficient
- Intelligent electronic controls
- Difficult to install
- Somewhat noisy
3. Rheem RTG-84XLN-1 Tankless Water Heater Review
This versatile little water heater can be installed indoors or out and it comes with freeze protection for temps as low as 30 below. Its fuel type is natural gas and it’s compact and recirculation kit ready.
One outstanding feature on the Rheem RTG-84XLN-1 Tankless Water Heater is the water saving technology. Not only will this heater help you save money on your electric bill, it’ll also help you conserve water. And the Hot Start Programming means that this unit remains in the ready-fire state to avoid cold water bursts and inconsistent heating.
Thanks to the low flow activation, this water heater will deliver hot water even in low demand situations. Additionally, the burner meets all safety and low emission requirements of SCAQMD. Another great safety measure is the Overheat Film Wrap which prevents the unit from potentially overheating.
This is another heater with a self-diagnostic system, so you can feel confident knowing you’ll be alerted to any potential or future issues should your water heater need maintenance. Overall, this is a high-quality compact tankless heater that utilizes smart features like water saving tech and low flow activation to save you money over time.
To watch the Rheem RTG-84XLN-1 Tankless Water Heater Review on YouTube, click here.
- Water saving technology
- Hot Start Programming
- Freeze protection
- Low flow activation
- Not intended for large spaces
4. Rheem 240V 3 Heating Chambers RTEX-24 Residential Tankless Water Heater Review
The Rheem 240V 3 Heating Chambers RTEX-24 tankless water heater is good for both single point of use or multiple applications. Because it gives you on-demand continuous hot water for RV or home, this compact unit is efficient, reliable, and versatile.
The bright LED external thermostat control displays the exact temperature ranging from 80 degrees Fahrenheit to 140. And the copper immersion heating elements are exceedingly durable as well as easily replaceable in times of maintenance.
Impressively, this is a self-modulating water heater. So it automatically adjusts to meet the hot water demand. Overall, this is a reliable tankless water heater that can rise to the demand of multiple applications throughout the entire house. It delivers consistency with temperature and ultimately saves the user a lot of money down the line.
To watch the Rheem 240V 3 Heating Chambers RTEX-24 Residential Tankless Water Heater Review on YouTube, click here.
- Easily adjust power to meet hot water demand
- Simple installation
- Bright LED display
- Durable copper immersion
- Installation requires knowledge of running wire
- Best for single-faucet use
5. Rheem MR50245 Marathon Tall Electric Water Heater 50-Gallon Review
If you’re looking for a storage water heater instead of tankless, you might be interested in the Rheem MR50245 Marathon Tall Electric Water Heater 50-Gallon. For a 50-gallon tank, this unit is fairly lightweight while being plenty durable.
One of the best features of Rheem MR50245 water heater is that it’s guaranteed (and warranted) not to leak as long as you own your home. The polybutene tank is corrosion and rust-resistant for longevity and the filament wound fiberglass lends to the unit’s strength.
This water heater comes with a limited lifetime warranty and a 6 year warranty on parts. It’s well insulated and holds heat well even if the power goes out. These tanks are well-known for being leak-free and highly reliable for the long-term. As you’ll see later on, if you want a Rheem with a tank, this is probably your best bet.
To watch the Rheem MR50245 Marathon Tall Electric Water Heater 50-Gallon Review on YouTube, click here.
- Upper element provides protection against dry-firing
- Guaranteed not to leak as long as you own your home
- Warranty on parts is from date of manufacture, not purchase
6. Rheem 240V 3 Heating Chambers RTEX-27 Residential Tankless Water Heater Review
This is a sturdy, reliable tankless water heater that saves you money and space. The Rheem 240V 3 Heating Chambers RTEX-27 Residential Tankless Water Heater has no problem with 3 to 4 sources running hot water simultaneously throughout the house. While you may need a professional installation, this unit should pay for itself within the first year.
Most of these tankless water heaters claim simple installation, but it all depends on how handy you are. Improper installation can derail the whole show, so making sure it gets done right the first time might be worth the extra investment.
This unit has a nice bright LED display so you can monitor the temperature with a glance. It also boasts the “most advanced self-modulation,” which means that it will automatically adjust the power to meet your specific hot water demands. Even in a bigger home with multiple family members, the Rheem 240V RTEX-27 has proven to be sufficient throughout an entire home.
One note is that if you have hard water, you might need to check the heating elements regularly for calcium build-up.
To watch the Rheem 240V 3 Heating Chambers RTEX-27 Residential Tankless Water Heater Review on YouTube, click here.
- LED display with digital control
- Accurate thermostat
- Installation should be a breeze for someone with knowledge
- If you have hard water, calcium build-up on the heating element is possible
7. Rheem Performance 2.5 Gallon 6 Year 1440-Watt Single Element Electric Point of Use Water Heater Review
This is a great unit for single point of use water heating. Although it’s not tankless, it is compact enough to fit into many cabinet or closet spaces to successfully heat a sink. It provides instant hot water and is specifically designed for under-counter installations.
This unit is fairly quiet when heating water which is important because it will be installed within the house. There is a drain that periodically removes sediments, which is a nice added feature.
Overall, the Rheem Performance 2.5 Gallon 6 Year 1440-Watt Single Element Electric Point of Use Water Heater might be a great option if you’re looking to install a compact point of use water heater in your bathroom or kitchen.
To watch the Rheem Performance 2.5 Gallon 6 Year 1440-Watt Single Element Electric Point of Use Water Heater Review on YouTube, click here.
- Space-saving point of use design
- Good for under-counter installations
- Easy installation
- Intended for single application only
8. Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater Review
This is a great little electrical water heater that’s ideal for 1-2 people in a smaller home, apartment, or cottage. The advanced self-modulation means this unit intuitively responds to the precise amount of hot water you need.
In the long run, a unit like Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater can save you a lot of money on your electric bill. However, if you have extremely limited electric amps in your home, consider one of the gas versions instead.
It’s worth noting that this heater is completely silent and nice-looking, making it both stylish and highly functional.
To watch the Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater Review on YouTube, click here.
- Tankless water heater
- Advanced self-modulation
- Digital temperature display
- Easy installation
- Uses a lot of power
Avoid – Rheem G100-200 Natural Gas Universal Commercial Water Heater Review
You can’t win them all. And with Rheem G100-200 Natural Gas Universal Commercial Water Heater, it seems to have struck out. This is the largest Rheem water heater on our list coming in at 100 gallons. It’s also the most expensive and, unfortunately, our pick for Rheem water heater to avoid.
The tanks themselves seem to be fairly poor quality, with a lot of instances of damage and deteriorating tanks after only a few years of use. This can obviously cause leaks and tremendous inconvenience. It’s also a huge waste of significant money.
In our opinion, you’re far better off with one of Rheem’s tankless water heaters. They’re cheaper than this unit, more durable and long-lasting, and they’ll help you save a good deal of money on your electricity bill.
To watch the Rheem G100-200 Natural Gas Universal Commercial Water Heater Review on YouTube, click here.
2021 Buyers Guide to the Best Rheem Water Heaters:
Choosing a hot water heater for your home is a big step. The wrong heater can cost you a lot of time, money, and patience. Below, we take a look at a few more features you might want to consider before you buy.
Main Points to Consider:
- Tankless or Storage – There are a lot of advantages to having a tankless water heater and potentially a couple of disadvantages. Tankless water heaters are best for smaller homes or homes that use modest amounts of water. Although tankless water heaters can be a pain to install (and usually require the help of a professional), they’re far more energy-efficient and they’re more compact. They also tend to last quite a bit longer than storage water heaters and have a lower risk of leaking. But if you’ve got a big family or you use a lot of water, a tankless water heater may not be up to the task. A traditional water heater with a tank is probably what you need. Cost-wise, storage water heaters are less expensive than the more innovative tankless version. However, tankless water heaters save you money in the long run.
- Self Diagnostic System – Some of the water heaters on our list are self-diagnostic. While a good tankless heater should last you around 20 years, there are parts that will need replacing along the way. Rather than figuring this out the hard way and then suffering through cold showers, a heater with a self-diagnostic system will warn you in advance if something’s breaking down. You can count this as a safety feature too. Look for this feature if you’re upgrading your water heater to ensure consistent hot water and a properly maintained system.
- Advanced Flow Technology – Advanced flow technology, as featured in some of the units on our list, means that water flow adjusts automatically. A tankless water heater with this feature can sense the demand for water. This helps ensure constant, stable temperature for your hot water. Rheem tankless water heaters are known for their high water flow rate and for being energy efficient. For best results, look for a water heater that highlights its use of advanced water flow technology.
Frequently Asked Questions (FAQs):
Are Rheem tankless water heaters good?
Many people love their Rheem tankless water heaters. A tankless water heater is one that does not store water but heats water using coils. This makes them impressively energy efficient but also means they provide limited hot water. So keep in mind that they’re best for small-to-medium sized homes.
As for longevity, most tankless water heaters will last you longer than a conventional water heater with a tank. You can get a good 20 years of use out of most Rheem tankless water heaters whereas a conventional water heater might only last you 10-15 years.
How long do Rheem tankless water heaters last?
Ideally, a good tankless water heater should last you 20 years or more. Most of the parts are easily replaceable, and they tend to last significantly longer than storage water heaters. Your self-diagnosing unit will notify you when a part is in need of attention or replacement.
What’s better, tankless or with tank?
Generally speaking, there are arguments that can be made for both. A lot of the tankless water heaters on our list are not recommended for large houses with many family members. However, when it comes to Rheem, they really seem to specialize in tankless heaters. If you have a small to medium sized home and a maximum of 4 people using hot water in your house, many of these Rheem tankless heaters will serve you well.
They’re compact, space-saving, money-saving, and most come with a handy self-diagnostic feature and digital temperature display. If your old water heater is failing, we recommend trying a tankless and having it installed by a professional. Any initial investment should more than pay off within the first year of use.
Rheem Water Heater Reviews (2021 Buyers Guide)
Final Thoughts On Buying a Rheem Water Heater
Clearly, Rheem has some great options if you’re looking for a tankless or small tank single point of use water heater. Within their tankless units, there’s some good variation on capability and capacity too.
But one of the most common complaints with these tankless water heaters involve issues that arise from improper installation and resulting failures or hassles. If you doubt your capabilities, or even if you don’t, it might be a good idea to enlist the help of a professional. When properly installed, these Rheem water heaters should keep you in hot water for at least 15-20 years.