The best outdoor tankless water heaters eliminate the need to preheat water before using it. They have several cool features that work together to enable them to provide hot water continuously. What’s more, these water heaters are equipped with technologies, such as self-modulating technology, which enables them to conserve water.
They are also energy efficient; hence, they will not make your energy bill shoot up. They are designed to make your life much more convenient than ever before. So, if you are interested in owning one or two, check out our top 10 best outdoor tankless water heaters in 2021 reviews.
List of the Best Outdoor Tankless Water Heaters Reviews
1. Stiebel Eltron tankless electric water heater
Everyone would like to own a technologically-advanced tankless heater. That’s why we are happy to bring the Stiebel Eltron tankless electric water heater to your attention. It is designed by Stiebel Eltron, one of the best manufacturers in the world. Stiebel Eltron gets its reputation from the immense experience it has developed over time. It has more than 90 years of experience in manufacturing tankless electric water heaters.
Having said that, expect this unit to perform effectively and reliably. The unit comes equipped with intelligent self-modulating technology, which ensures that the least amount of energy is used. It is a top-notch outdoor tankless water heater that performs to the highest standard for reliability and comfort. The best part is that this electric water heater operates silently despite being super durable.
It is small and compact plus it requires no venting. This means handling it is really a breeze. Furthermore, the outdoor tankless water heater has advanced flow control that automatically maintains hot water temperature, thereby, providing endless comfort. It fits the bill for anyone who likes it when their shower is always hot.
2. Atmor 18kW/240V Electric Tankless Water Heater
You can now revolutionize your water heating in a snap. All you need to achieve that is the Atmor 18kW/240V Electric Tankless Water Heater. It has smart flow technology that offers endless hot water to make sure you do not experience any kind of discomfort every time you step into the shower.
This outdoor tankless water heater also has an advanced self-modulating system, which not only controls the water flow but also regulates the amount of energy needed to heat the water. By so doing, the self-modulating system lowers water consumption as well as playing a huge role in saving energy bills.
The digital panel is extremely easy to use, and it allows full control with the power in order to make the adjustments of the temperature very accurate. This means achieving a perfect temperature setting every time will be a cakewalk. Another feature that makes this tankless water heater a top performer is the space-saving, compact design that does not require venting and can be installed anywhere inside the garage or home.
3. Eccotemp Tankless Water Heater (FVI-12-LP)
You can use this outdoor tankless water heater for a lot of applications, including apartments, cabins, businesses, and tiny homes. The tankless water heater is rated 3.6 GPM, meaning it activates only when in use, making it a great energy saver.
The digital temperature display of this tankless water heater is easy to read, and this helps make the model easy to operate. Moreover, the Eccotemp FVI-12-LP model boasts a compact, space-saving design plus it outputs minimal noise. This means you will enjoy a hot shower without any disturbance. Eccotemp provides an instruction manual as well as hardware pack to make sure you have an extremely easy time installing and operating the water heater.
The company also provides a 2-year limited warranty that protects this outdoor tankless water heater from defects. Ideally, the model is built with safety in mind. It has a safe ignition electric system that plugs into a standard 120V electrical outlet via the included UL-listed cord.
4. Rheem 8.4 GPM Outdoor Tankless Water Heater (RTG-84LXN)
You need such a top-quality tankless water heater as the Rheem RTG-84LXN for quick and effortless heating of water at home. Because of its innovative, tankless performance, this water heater ensures you always have hot water. Best of all, it will provide you with an endless supply of hot water without raising your energy bill.
It also has a space-saving design; hence, it is extremely easy to use. Still on ease of use; the outdoor tankless water heater comes with 10-feet of thermostat wire and UMC-117 remote control. It is important to note that the outdoor tankless water heater should be installed outdoors only.
Its dimensions are 14 by 10 by 26 in, and it weighs 54 pounds. We have talked about it in this article because we believe it is exactly what you need. Its price is okay for what it is and we are positive it will meet your expectations.
5. Rheem 240V R Tankless Water Heater (RTEX-13)
In 1925, Rheem Manufacturing Company was founded. The brothers Richard and Donald Rheem came together and founded this great company in Emeryville, CA. Well, it’s almost a century and the company is still doing great. With that said, expect the Rheem RTEX-13 to be a stunning investment. It is equipped with digital thermostatic control that is adjustable and has an LED display.
Moreover, it has copper immersion two heating elements that are durable for long-lasting performance. Plus it is 99.8-percent energy-efficient. The external controls for adjusting the temperature in increments of 1 degree F and the water-saver showerhead (1.5GPM) play a big role in reducing water and energy consumption. What’s more, installing this water heater is extremely easy.
This is because it comes with ½ NPT adapters and a 3ft electric cable. The installation is further made a breeze by the threaded engineering, which also ensures easy replacement. Rheem is currently the manufacturer of cooling, heating, and commercial refrigeration products, among others. It is a reputable company; hence, we are sure you will love its tankless water heater.
6. Rheem 9.5 GPM Tankless Water Heater (RTGH-95DVLN)
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One of the many reasons why we love Rheem products is that they are rigorously tested to meet and exceed industry standards for reliability and quality. Well, the Rheem RTGH-95DVLN model is no exception. It is completely safe to use because it meets all the crucial requirements.
Additionally, the tankless water heater is 94-percent energy efficient. While this does not make it the most energy-efficient outdoor tankless water heater in its class, it is impressive enough to give you peace of mind knowing that you will not spend extraordinary figures to sort out your energy bill.
Energy efficiency is further improved by intelligent electronic controls, which also take safety to another level. Well, the price tag of this water heater may be a bit heftier than most units in these reviews. However, we don’t think this should be a concern because the water heater performs so well you will not like it – you will love it!
7. Rinnai V Series HE Tankless Hot Water Heater
The convenience and comfort of hot water at a pocket-friendly price is irresistible. Well, the Rinnai V Series HE Tankless Hot Water Heater is designed to provide this comfort and convenience. It provides up to 7.5 GPM hot water flow rate (depending on the temperature of groundwater) to make sure you never have to think twice every time you want to bathe. It is a high-performance hot water heater that is very easy to use.
In fact, you can put it into vacation mode; thanks to the Control-R 2.0 mobile app, which features timers as well as schedules throughout the day. To prove to you that it will deliver as promised; the tankless water heater is backed by several warranty policies.
These include a 120-month warranty on heat exchanger, a 12-month warranty on labor, and a 60-month warranty on parts. It is important to note that this tankless water heater should be installed indoors. It uses natural gas, and it is powerful enough to continuously provide hot water to your entire home.
8. EcoSmart ECO 27 Electric Tankless Water Heater
A water heater that will provide you with an endless supply of hot water at no extra cost is worth investing in. We are
talking about the EcoSmart ECO 27, which is a comprehensive unit with all the features to improve your life. It saves up to 50-percent on water heating costs, making it a perfect purchase for any economic-minded person. Ideally, this outdoor tankless water heater measures 17 inches high by 17 inches wide by 3.65 inches deep.
It is compactly sized and capable of saving up to 12 cubic feet of storage space. The tankless water heater also features digital temperature control in 1-degree increments to give you total control of hot water. The design of this unit is advanced and stylish.
There are copper and stainless components, which help improve durability, efficiency, as well as ensuring easy replacement. The advanced self-modulating technology ensures that this water heater only uses the amount of energy required.
9. thermoflow Tankless Water Heater for Wash Basins and Utility Sinks
The thermoflow Tankless Water Heater has found its way into these reviews because its tankless design enables it to save up to 60-percent on water heating costs. Besides, it eliminates the need to pre heat water before using. This means as soon as you open the tap, the water will flow with the desired temperature.
It is a convenient tankless water heater that will make your life much easier than ever before. Another thing to say about this incredible water heater is that it has a compact design. It is so compact that it is smaller than a shoe box. Besides, the water heater has a wall-mounted design that frees up space on the floor to ensure more storage.
The innovative design makes this water heater extremely easy to install into a washbasin or other tight spaces. The tankless water heater is constructed with premium alloy bare heating element. This construction is very impressive, considering that it has good resistance to corrosion and acid. Needless to say, the tankless water heater will provide you with long-lasting performance.
10. Eccotemp L10 2.6 GPM Portable Tankless Water Heater
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There is a unique feature the Eccotemp L10 Water Heater is equipped with. This feature is the 20-minute auto safety shut off timer that resets water stops and then starts again. It is a rare but very crucial feature, which makes the portable tankless heater extremely easy to handle.
What’s more, the water heater comes with a ½-inch NPT to garden hose adapter. It also comes with a stainless steel rain cap, which is waterproof and removable. Plus it is equipped with an adjustable 20 – 80 PSI pressure water range as well as manual water temperature controls. The portable tankless heater is purely built with convenience in mind, making it the go-to unit for anyone who wants to set up an outdoor shower.
It is also perfect for camping and can as well be used to bathe dogs, horses, and other animals. Other features include pressure activated function and battery-operated ignition. The water heater is easy to set up and use not to mention working seamlessly with any shower head and hose.
Buyer’s Guide for the Best Outdoor Tankless Water Heater
Here are the factors to have in mind before buying an outdoor tankless water heater.
The thought of buying an outdoor tankless water heater is always a good one. But again, these units can make your energy bill shoot up dramatically. So, before buying one, make sure it has features and technologies that help it save energy. A good example of a technology that improves energy efficiency in tankless water heaters is the self-modulating technology.
A good outdoor tankless water heater should be equipped with an easy-to-read display. This is because such displays play a huge role in making a tankless water heater extremely easy to use. Therefore, to have a hassle-free experience with your unit, consider the one with a nicely-sized display that shows everything clearly.
Although outdoor tankless water heaters are compact, this does not mean they are super easy to assemble. The fact that you are likely to assemble them in a tight space or washbasin means you should not assume that everything will go in smoothly. As such, before spending money on a tankless water heater, make sure it comes with the necessary hardware for quick and easy installation.
Frequently Asked Questions
Which outdoor tankless water heater is the most energy-efficient?
We cannot think of a better product than the Rheem 240V R Tankless Water Heater (RTEX-13) when it comes to choosing the most energy-efficient tankless water heater. This unit is 99.8-percent energy-efficient.
Which outdoor tankless water heater is the cheapest?
Tankless water heaters in these reviews are reasonably priced. But the one that leads the way is the thermoflow Tankless Water Heater for Wash Basins and Utility Sinks. It is very affordable; hence, it is the perfect choice for anyone on a budget.
Which outdoor tankless water heater is the easiest to install?
Installing an outdoor tankless water heater can be a bit tricky. So, if you are not a DIY enthusiast or simply finding things quite daunting to install, we recommend that you try the Rheem 240V R Tankless Water Heater (RTEX-13). It comes with a ½-inch NPT adapter, 3’ electric cable, and boasts threaded engineering to make installation a breeze.
Which outdoor tankless water heater is the most compact/portable?
Again, all outdoor tankless water heaters in these reviews are compact. But like in every competition, there must be a winner. Therefore, the most compact is the thermoflow Tankless Water Heater for Utility Sinks and Wash Basins. It is so compact that it is smaller than a shoe box.
An outdoor tankless water heater is a convenient unit designed to provide you with an endless supply of hot water. Its tankless design makes it extremely easy to install even in tight spaces. It also enables it to serve its main purpose, which is to continuously provide you with hot water. If you didn’t know what to pick, we hope that now you know.