When it comes to hot water, Tankless water heaters are the best choice for uninterrupted and instant hot water supply than the conventional tank water heaters.
Tankless water heaters are also known as on-demand water heaters as they provide hot water within minutes whenever hot water is required without the need of a bulky 50-gallon water tank.
On an Average, Most tankless water heaters save at least 1/3 fuel cost and 15 mins of waiting time to bath.
There are many benefits in buying a tankless water heater for your home. Most importantly you can save a good amount of money and time apart from enjoying unlimited and continuous hot water without waiting.
What is the best tankless water heater?
The increasing popularity and demand of tankless heaters have made many big brands and middle sized companies to create their own version of tankless water heaters.
With the number of brands selling tankless water heaters with different features on the market, how do you know which one is best suited for your household needs?
Well, our top 10 tankless water heaters reviews and buying guide with pros and cons of each water heater with a detailed review will defintely help you to choose the best tankless water heater for your home.
TOP 10 Best Tankless water Heater Reviews
Honestly speaking there is no tankless hot water heater that we can recommend it as the best tankless hot water heater. Why? For a simple Reason, Each individual has different requirement and expectations. What might look best for one may not be suitable for another individual?
Tankless Water Heater Reviews – Comparison Table
|Rheem RTE 13||Electric||4||240 V|
|Stiebel Eltron Tempra 24 Plus||Electric||8||240 V|
|EcoSmart ECO 27||Electric||5.3||240 V|
|Eccotemp L5||Liquid Propane||1.4||37,500 BTU|
|Takagi T-KJr2-IN-NG||Natural Gas||6.6||140,000 BTU|
|Marey Power Gas 10L||LPG|
|Camplux 10L||Propane||2.64||68,000 BTU|
|Rinnai RL75iN||Natural Gas||7.5||10,300 - 180,000 BTU|
|Navien NPE-240A||Gas||11.2||120 V|
So let us now get into the actual tankless water heater reviews without any further delay.
Rheem RTE 13 – Best Selling Electric Tankless Water Heater for small households and apartments
The Rheem RTE 13 is one of the most affordable tankless water heaters on the market today. Ranked as one of the bestselling brands, Rheem had been providing high quality and efficient products for homes ever since the 1920s and it is no wonder that this brand is one of the top selling brands in the market.
Rheem RTE 13 model is an electric tankless water heating system and great for single shower applications that work with Standard 1/2″ water connection. The device is ignited when water passes through a sensor. It also does not need any ventilation since there is almost no heat loss and energy is handled efficiently.
The Rheem RTE 13 makes use of a rugged brass/copper heat exchanger which is an efficient conductor of heat. When water flows through the system, its sensors ignite the device and water is heated inside the copper heat exchangers. It is electrically powered but with its modulating power, you don’t waste any energy as it only makes use of power when needed. At such a compact size, it can deliver up to 4 gallons of water per minute.
One of the best features of this tankless water heater is its Low Flow Activation which means you still get hot water even if you only turn the tap on a low setting. Another great feature is the dial on the front of the device that lets you adjust the water temperature to low, medium, or high easily.
There is also an On-unit temperature control, LED indicator to let you know when it is being actively used and when it is on standby mode. It is also small enough that you can attach it near its point of use giving you lesser heat loss during the time the water travels through the pipes.
Rheem RTE 13 is the best Electric Tankless Water Heater is ideal for Point-of-Use Applications that provides Continuous Hot Water on Demand with Energy Efficient Compact Design. It is the most affordable and cheapest tankless water heater best suited for Homes, Apartments, Condos, Hospitals, Hotels, Boats, Restaurants, Offices, Laboratories and anywhere instant hot water is needed.
Overall, the Rheem RTE is a great on demand electric water heater with its small size, fast and efficient delivery of heated water, temperature dial setting, and the Low Flow Activation. Aside from that, it is also one of the mid-range priced products in the market which means that you can easily afford it.
Stiebel Eltron Tempra 24 Plus – Best Whole House Electric Tankless Water Heater
The Next product in our top 10 list of tankless water heater reviews list is Stiebel Eltron Tempra 24 Plus, comes from the company which pioneered the small tankless water heater design. It comes with the guarantee of German quality as well as the years of innovation of Stiebel Eltron.
Stiebel Eltron Tempra 24 Plus is one of the most technologically advanced tankless water heater available on the market today. Stiebel Eltron Tempra 24 Plus reduces the electric bill and saves energy on average of 15%-20% kWH compared to a conventional tank water heater.
Our Reviewers has found Tempra has many advantages over a gas-type tankless water heater when compared to many similar gas tankless models. Tempra is less expensive to purchase. Installation is also much simpler and cheaper since it is not necessary to vent a Tempra to the outside. This features clearly indicate why it is considered one for best rated tankless water heater in our top 10 list.
The Tempra 24 Plus is a 24 kilowatt electric tankless water heater which delivers about 6 gallons of water per minute on a 75F incoming water which is good the whole house to supply instant hot water on demand without waiting. It is specifically designed for areas where incoming water is very low or for those who have a high demand for heated water at a given time.
It has its own unique Tempra Advanced Flow Control system which aims to deliver the set temperature all the time. The Advanced Flow Control System slows down the flow of water whenever there is a high demand but there is never a loss in water temperature. You will get consistent hot water all the time even when there is simultaneous use.
This tankless water heater comes with a digital display and a manual dial to help you set the temperature to desired settings. It has a sleek industrial design which makes it ideal for any modern home. You can also set the maximum temperature to 109 degrees in order to prevent any scalding. Since it is electric, you also do not have to install any vent at all and you also do not have to worry about the electrical consumption because it is 99% energy efficient which means you do not lose any heat at all.
The Stiebel Eltron Tempra 24 Plus is great for whole household water heating without getting any cold showers when the demand for hot water is high. You will also love the fact that it does not require any external flue or vent for excess heat as it has a very efficient heat exchanger. If you want the most energy efficient tankless water heater, then this should be your choice.
EcoSmart ECO 27 – Best Valued Electric Tankless Water Heater
EcoSmart is one of those companies that are aiming towards environment-friendly products that can also help reduce power consumption. The EcoSmart ECO 27 is one of these products which helps to make energy-efficient water heating possible.
The EcoSmart ECO 27 is an endless electric hot water heater comes with the company’s patented self-modulating technology to help save energy. It also makes use of a copper heat exchanger which helps provide a more efficient heat conduction.
Since this is an electric tankless water heater, there is a continuous supply of hot water on demand. It can be used for the whole house or for a specific area of the house. Its self-modulating system ensures that only a sufficient amount of energy is used in order to raise the incoming water temperature to the set temperature on the heater. Hence, you save up to 50% on energy consumption.
The maximum power consumption is 27 KwH but this does not mean that this is what you will actually be consuming every time you use it. If you are located in a warmer area, then that energy consumption will be lesser.
ECO 27 is an Ideal electric hot water heater for homes in the northern United States where incoming water temperature can be as low as 37°F. The ECO 27 is one of the largest electric tankless water heater capable of heating nearly 3 gallons per minute at low temperature. It can handle the hot water supply of up to two showers running at the same time and so you will never run out of hot water.
The ECO 27 is perfect water heater for providing high demand of hot water between multiple applications for homes in the southern United States. It can handle up to 6 gallons per minute, which means you can run four showers and a sink simultaneously and will have continuous and uninterrupted hot water.
This water heater is compact and can be mounted on the wall, weighing only about 13 pounds. It has a digital temperature setting that can be adjusted by 1-degree increments through a circular dial at the front. There is also a remote control that can be bought separately. This tankless water heater can also heat 3 gallons of water per minute.
Overall, the EcoSmart ECO 27 is a great electric tankless water heater for those who have a small to medium-sized family. Whether you are in a colder or warmer climate, this can effectively handle energy needs to provide proper heating temperatures through its self-modulating technology. With its 99.8% energy efficiency, you are sure to save a lot from your power consumption.
Eccotemp L5 – Best Portable and Outdoor Tankless Water Heater
If you want hot water during camping trips or when you are off the grid, the Eccotemp L5 Portable Tankless Water Heater and Outdoor Shower will be the best on demand water heater that you can get. Eccotemp is the first and still one of the best-selling portable tankless water heaters in the market today, it is definitely worth more than what you pay for it.
The Eccotemp L5 makes use of propane gas in order to function hence, it can be easily used for camping trips and other outdoor activities. Ignition is also by 2 D cell battery so there is no need for an electrical connection.
This water heater works by sensing the flow of water through the outlets and can work from 20 to 80 PSI. Any lower than that and the device will automatically turn off. It can heat water from 80 to 150 F and can deliver up to 1.5 gallons of water per minute. It has two dial settings at the front to control the temperature and water pressure. All that you have to do is to connect your water supply and propane gas to the heater.
The Eccotemp L5 comes complete with everything that you may need to use it as a portable tankless water heater and even as a shower. It comes with a shower head with an on and off switch and with several spray settings, a garden hose adapter, a gas regulator, hardware for assembling and even Teflon tape.
It weighs approximately 14 pounds so it is very easy to carry around and the attached handle and keyhole design at the back makes it easy to hang anywhere. Another great feature of this heater is an automatic shutoff design after using it for 20 minutes. This is great especially since it makes use of propane gas.
The Eccotemp L5 is a great portable tankless water heater to have when you are planning outdoor activities and would still love to enjoy the comfort of a hot shower. It is light and with the carrying handle, it is definitely easy to carry around. All the things that you will need to setup are included in the package. It offers a decent performance at a very affordable price.
Takagi T-KJr2-IN-NG – Best Indoor Tankless Water Heater for medium households in cold weather
The Takagi T-KJr2-IN-NG is a small but powerful Indoor Tankless Water Heater that comes with the durability and efficiency of a Japan-made product. Takagi is well-known for making products with high-end materials that last for a very long time.
The Takagi T-KJr2-IN-NG is powerful enough to heat up to 6.6 gallons of water per minute. What makes this heater so efficient is its effective use of natural gas heating up to 140,000 of BTU, you can easily get your hot water within seconds. Although this is a gas powered water heater, it still requires electricity to start it.
Takagi T-KJr2-IN NG Non-Condensing Gas Tankless Water Heater capable of delivering 6.6 GPM (Gallon per minute) of hot water and it is perfect for light residential such as small apartment units and radiant heating applications
This tankless water heater makes use of three different stages of heating through a copper heat exchanger and can heat water from 99F to 167F. It requires a ¾” water and natural gas connection and a PSI of 15-150.
It does require a stainless steel vent. With a compact size measuring about 20 inches in height and 13 inches in width, it can easily fit anywhere in the house.
It also has several great features. For one, it comes with a remote that allows you to set your preferred temperature without having to go directly to the heater.
Another is the temperature control feature that automatically turns the heater off once it reaches the hottest temperature limit. It has freeze protection, surge protection, and an Air Fuel Ratio sensor that monitors the air quality that it releases in the environment. You can also use it for radiant heating applications.
The Takagi T-KJr2-IN-NG Indoor Tankless Water Heater is a great device for those who have a small to medium household. It’s durability as well as its efficiency in providing consistent hot water temperature makes it worth it at its price. Aside from that, the built-in protection that it offers for natural gas users such as the surge and temperature controls makes it a very safe indoor tankless gas heater.
Marey Power Gas 10L – Best Gas Tankless Water Heater with Digital Panel
The Marey Power Gas 10L is one of the most affordable water heater and most popular brands in the market as well. The thing that distinguishes Marey from all other brands is their use of eco-friendly materials which means that by purchasing their products, you are also contributing to preserving the environment.
Marey Power Gas 10L delivers endless hot water with optimal energy efficiency with no electricity required. It also comes with a water and gas dial so you can adjust the temperature and the pressure of water that you like. The lowest setting for the water pressure is at 3.6 PSI and the temperature increase can reach up to 67F on a 1.5 GPM. It also has a Winter and Summer dial which allows the heater to adjust the amount of heat being used.
This tankless water heater is perhaps one of the best natural gas tankless water heaters in the market today. It is powered by 2 D cell batteries to start ignition and is powered by gas which means no electricity expenses at all. All that you have to do is to connect your water and gas sources to their respective outlets in the device and you are good to go. The device automatically turns on when water flow is detected.
In terms of features, it has plenty to offer. The first is its sleek and modern design with its silver finish. It also comes with an LCD display that allows you to see the temperature of the outgoing water.
Next are the built-in anti-combustion feature for gas and pressure safety. It also has an anti-rust feature which ensures years of leak protection. But perhaps its best feature is the fact that costs just a little over $200 which is definitely a great deal for a multiple use tankless water heater.
The Marey Power Gas 10L Digital Panel Tankless Water Heater is a great product especially if you want to save on your electricity consumption or if you simply don’t have access to one. It’s compact size, battery-powered ignition, water and gas dial settings, winter and summer settings that can be adjusted manually all make for the best off the grid water heater.
Camplux BW264 10L 2.64GPM – Best Propane Portable Tankless Water Heater for camping and outdoor
The Camplux BW264 is a great tankless water heater that will go well with camping and other outdoor activities. It is one of the most affordable portable water heaters in the market and it has the added benefit of a digital display as well.
This water heater uses propane gas and has a winter and summer setting which lets it adjust gas consumption for efficient heating. It has a digital display which shows temperature settings and a dial for gas and water pressure. It is also battery operated for ignition so there is no need for an electrical source. It has a maximum output of 2.64 gallons per minute depending on the incoming water temperature.
The Camplux BW264 uses a copper heat exchanger for effective water heating. Ignition is through 2 D cell batteries which can last up to 6 months. It also has a flame sensor which shuts down the gas if there is flame failure. You also don’t have to worry about forgetting to turn off the gas as it has an automatic safety device that shuts the machine off after 20 minutes of continuous use. You can use almost any type of water with this heater.
This is a compact portable water heater which measures about 13 inches in length and 21 inches tall. It is also very lightweight, about 18 pounds, so you can easily take it with you. It also comes complete with everything that you will need for installation such as a gas regulator and hose, a shower head with hook, chrome shower hose, and all the screws and hardware that you will need to assemble it.
Another great feature is the digital temperature display which shows it in unit Centigrade. They have also printed the equivalent in Fahrenheit on the front of the device. It has a nice white finish which makes it really neat.
Overall, Camplux BW264 is one sturdy and reliable portable tankless water heater. It is best recommended for those who do not want a lot of hassle during installation and assembling. The built-in safety features, as well as the winter and summer settings, will help you save a lot in gas.
Rinnai RL75iN – Best Natural Gas Tankless Water Heater
The Rinnai RL75iN is a small but hardworking residential and commercial water heater. Rinnai is a popular brand in the market for tankless water heaters and this is due to the high quality products that they offer to the market.
This water heater makes use commercial grade copper heat exchangers that provide efficient heating for up to 7.5 gallons per minute. It can put out up to 180,000 BTU of heat which can raise water temperatures from 98F to 140F. It also has an anti-freeze system which makes it highly recommended even for colder locations.
The Rinnai RL75iN Natural Gas Tankless Water Heater uses electronic ignition in order to start the device. This is triggered once the system senses water flow even at a minimum of 20 PSI. It also has a MC-91-1US Digital Controller with Error Code Indicator attached at the front of the device which makes it easy to set desired temperatures and to detect what is wrong with the device if there is any.
This water heater has a lot of excellent features starting from the high quality materials that are used for its parts. It has a concentric vent which lets you get rid of excess heat either horizontally or vertically.
One of its outstanding features is that it delivers a lot of GPM at a very compact size. It only measures 14 inches in length and 23 inches in height. It also does not require a lot of clearance due to its sealed-combustion system so you can install it almost anywhere.
If you want a compact but heavy duty tankless water heater that can provide heating needs for a medium-sized household then the Rinnai RL75iN Natural Gas Tankless Water Heater is the best that you can get in the market. It’s so small that you can conveniently install it anywhere and safe enough that you can install it indoors.
Navien NPE-240A – Premium Condensing Tankless Gas Water Heater
Navien NPE-240A is one of the bestselling products of the Navien Company due to its high thermal efficiency and also to its environment-friendly features. Navien is a recent competitor in the US but the company had been developing boilers with condensing technologies for decades for the Asian market hence their expertise in condensing technology.
This is a condensing tankless gas water heater which means that it utilizes thermal energy more efficiently than regular gas heaters. It has a maximum thermal input of 199,000 BTU per hour which makes it sufficient to provide heating for a whole household. They also make use of the ECO premix burners which allows for less CO2 and nitrous oxide emissions. It can provide up to 11.2 gallons per minute of hot water at a 35F temperature rise.
This model is activated once water flows through the sensors which then ignites the gas burners. Water passes through two stainless steel heat exchangers and has an energy efficiency of .97 due to its condensing technology. This is the only brand in the market that offers Comfort Flow technology through its buffer and recirculation tank so you don’t get that burst of cold water in between uses.
This high-end water heater comes with a lot of features as well. You can use either natural gas or propane gas to operate it and is suitable for both residential and commercial use. It has ComfortFlow Technology which continuously heats a small amount of water in its buffer tank so you don’t get cold water sandwich.
You can also utilize existing ½” gas lines with this heater and you can also use PVC pipes for venting due to its lower temperature emissions. It also has a digital temperature display and control at the front so managing your hot water is fairly easy.
Overall, this is perhaps one of the best gas tankless water heaters that you can get for your home. The high energy efficiency due to its highly efficient condensing technology, less greenhouse gas emissions, and its ComfortFlow technology makes it a very unique product in the market. It is definitely worth buying for anyone who is looking for high performance and durability in a water heater.
iHeat Tankless S-16 – Affordable Water Heater
The iHeat Tankless S-16 is perhaps the most compact electric tankless water heater that you can install in your home. It is also one of the cheapest models in the market that can deliver whole house water heating needs.
This small yet powerful tankless water heater uses 16 kilowatts of electricity in order to deliver 3.5 gallons per minute of hot water which is good for 2 bathrooms and a sink. Its casing and heat exchanger is made of pure stainless steel so there is no rusting in this water heater. The casing is also fire proof which is a great safety feature.
Since it utilizes electricity, there is no significant loss of heat and therefore no need for venting. You can install it anywhere in your house but if you are in a colder climate, you may want to put it near the point of use. Its flow technology allows it to activate even when you are using very little water. It also features the Advanced Power Modulation which manages power use depending on the incoming water temperature and also upon real time use of water.
This tankless water heater comes with a waterproof feature making it ideal for installations near bodies of water. It also features a digital temperature display that has options for either Celsius or Fahrenheit reading. You can also adjust it by 1-degree increments with the high or low buttons. iHeat has also added easy grip fittings for the water outlet and inlet so it is easier to install. It only measures about 11 inches by 9 inches making it very compact and easy to install in any area in your house.
In general, the iHeat Tankless S-16 is still a desirable device if you want something that is priced mid-range but can perform like the more expensive models. The water and fire-proof casing, as well as the whole-house capacity of this electric tankless water heater, makes it a good investment. It is also great for those who live near the sea or who have a high degree of humidity as it is made of stainless steel so you don’t have to worry about rust.
Tankless Water Heater Buyer’s Guide
Tankless water heaters are a great modern convenience since they require minimum space and deliver hot water efficiently with little loss of thermal energy. Before, one can only get water heated if there is a huge water tank in the home but today, all that you would need is a set of screws to install this small cabinet in a part of your home.
So how do you select the right tankless water heater?
There are a variety of price ranges and additional features that come with tankless water heaters. Some of them may sound really nice and attractive but do you really need them?
There are plenty of things to consider when choosing the best tankless water heater that will work for you. You have to look at energy and thermal efficiency as it will determine how much savings you can get, safety features, temperature and control settings for gas and water pressure, capacity in terms of number of hot water gallons that it can deliver per minute, ability to handle colder incoming water, size and portability, venting requirements, and also the costs in installation as well as the price of the product itself.
Electric vs Gas – Which is best for you?
We prefer electric water heaters because they deliver almost perfectly when it comes to water heating.
Gas water heaters were the original versions of water heaters. They require either natural or propane gas which is readily available. But they have a lower energy efficiency so a lot of heat can be lost through the flue or vent. Some companies have come up with condensing systems though to capture as much heat as possible. But the problem with this type, however, is the possibility of a gas leak as well as of the flame going out due to wind. Add to that the fact that you have to install a vent or a flue so you always have to install it near a wall.
In electric tankless water heaters on the other hand, there is almost no loss of energy used and there is no complicated venting needed when it comes to installation. You can also easily install it anywhere you want in your home as there is no need to let out emissions. They are also usually very compact that you can place them near the point of use.
- Automatic Ignition. Most electric tankless water heaters can ignite automatically through electricity once water flow passes through the sensors. So there is no need for manual ignition.
- Digital control and display. The digital display and control allows you to monitor and control the level of heat that you want for your home.
- Low PSI settings. Unlike gas water heaters, electric ones depend on sensors and not on water pressure. So even with little water flow, you can still get hot water.
- Electric tankless water heaters are only activated when there is water flow so there is no loss of energy since there is no standby heaters. It can also sense the amount of water flowing so it can easily adjust the amount of electricity used to heat it up.
- High energy efficiency. With electric water heaters, all the heat applied is used up in heating the water. Energy efficiency is up to 99.9% whereas standard gas heaters only have an average of 85 or 87%. Because of this, you also don’t have to install a vent or a flue which can be an eyesore.
- Compact size. Unlike gas water heaters, electric ones do not require a lot of components inside the box or cabinet. Hence, they can come in very small sizes that can fit almost anywhere.