Tankless Water Heater Reviews – Best Options by Brand, Type & Budget

In A Rush? Get This One

Reasons to buy...

  • Easy to install, easy to follow instructions
  • Great value for your money
  • Savings of up to 50% on water heating costs. 
  • Environmentally friendly
  • Perfect for small spaces

tankimage1To tankless or NOT to tankless? THAT is the question.

When it comes to tankless water heaters, homeowners are often beguiled by promises of unlimited hot water, lower energy bills and more space. However, the benefits of a tankless water heater — along with the drawbacks — depend on your circumstances, i.e:

  • How much hot water you use
  • The number of people in your household
  • The amount of hot water you use
  • Whether you live in a warm or cold climate

If your head is already spinning — FEAR NOT!

9+ Best Tankless Water Heaters Reviewed


Kermit the Frog said that it’s not easy being green — but EcoSmart makes green energy seem effortless.

Unlike many other electric tankless heaters, the ECO 27 can provide the optimal, consistent heat in both warm and cold climates. Don’t believe it? Well, the ECO 27 challenges your doubt with a lifetime warranty.


The icing on the cake? This machine is strong enough for large homes (not always the case with many other electric tankless heaters), AND it’s super easy to clean and maintain.


  •  Indoor
  • Minimum temperature (F): 80
  • Maximum temperature (F): 140
  • Weight: 8 lbs.
  • Dimensions: 6 x 17 x 17 inches
  • Lifetime warranty

What We Liked:

  • Self-modulating technology allows you to use the least amount of energy possible to keep your water hot without costing you
  • Ecosmart touts that users can save up to 50% on their energy bills
  • The ECO 27 proves that POWERFUL things come in small packages by heating 3 gallons per minute…AND…by producing hot water on demand at a temperature of 105 degrees Fahrenheit.
  • Easy maintenance and easy-to-replace heating elements
  • Lifetime warranty. Let me repeat that: This puppy has a LIFETIME Warranty
  • Appropriate for singles as well as those in family homes


One caveat that can come with electric tankless heaters is that they can sometimes struggle when heat demand is high (i.e., you and your brood/roommates schedule shower times back-to-back-to-back). But the Tempra Plus 24 is up for the challenge.


  •  Indoor
  • Minimum temperature (F): 86
  • Maximum temperature (F): 140
  • Weight: 1 lbs.
  • Dimensions: 7 x 20.1 x 9.6 inches
  • Heater exchange warranty: 7 years

What We Liked:

  • Stiebel’s Advanced Flow Control maintains optimal temperature by slightly reducing flow
  • Ideal for homes with 2 bathrooms in warm climates, or 1-2 bathrooms in cool climates
  • Options! You can choose to use the manual control to manually reduce the amount of energy used…OR…you can set it and forget it with the self-regulating thermostat
  • Saves an estimated 15-20% on electric bills as compared to an electric tank heater


It’s a bird…

It’s a plane…

It’s a — WHOA — Rheem RTGH-95DVLN 9.5 gallons per minute (GPM)!

It may be pricier than some of the other models, but this version of the Rheem is a hero amongst other tankless water heaters. No matter the size of your family, home or the type of climate you live in, the Rheem can handle it.


  •  Weight: 82 lbs.
  • Dimensions: 5 x 9.8 x 27.5 inches
  • Low Nox version
  • Ideal for 2-3 bedrooms

What We Liked:

  • The Rheem is a condensing unit, which happens to be the most energy-efficient gas option on the market
  • Can handle any size household and climate
  • The Rheem has a high flow rate of 9.5 GPM, giving it the strength to heat three full-flow showers at once
  • Powerful enough so that water will remain hot, hot, HOT even at peak usage…in a four bedroom home…even when the temperature outside is BELOW -30 degrees Fahrenheit
  • Self-diagnostic controls
  • Designed to prevent overheating thanks to a patented Guardian OFW overheat film wrap.
  • Hot start programming keeps water temperatures consistent to accommodate back-to-back showering.
  • Can save homeowners up to 1,100 gallons of water per year


The Rinnai V75iN successfully straddles the line between brawn and efficiency. Ideal for the average household, the V75iN is capable of running 2-3 things at once, granted that you’re using low-flow plumbing fixtures.

The main reason that the V75iN makes the list, is that it really provides the optimal balance of features for pretty much any residence. Even if you have a household where a shower, washing machine and dishwasher is running consecutively (you busy, busy bee!), the efficiency and quality of the V75iN won’t be compromised.


  •  Weight: 6 lbs.
  • Dimensions: 14 x 9 x 23 inches
  • Temperatures range from 98-140 degrees Fahrenheit
  • 10-year limited warranty

What We Liked:

  • Compact and can fit in various places, including attics and crawl spaces
  • Unlimited hot water even when you’re using multiple fixtures at once
  • temperature lock prevents accidental or unauthorized changes to water temperature
  • Built-in leak detection that will automatically shut the machine off if a leak springs. This is FANTASTIC and can prevent water damage (and costly repair bills) to your home
  • Able to work in both warm and cold climates
  • Certified for mobile and prefab homes as well


If you’re looking for the ultimate tankless water heater for a small home or office, look no further than the Eccotemp FVI-12-LP!

This little machine is SUPER inexpensive, so if you need a quality heater, but don’t require a ton of hot water (i.e. you live by yourself or with people that don’t use water…hopefully it’s the former), this machine is perfect.


  •  Maximum temperature: 50 degrees higher than incoming water
  • Weight: 20 lbs.
  • Dimensions: 4 x 15 x 24 inches
  • Gas-powered
  • Two year warranty

What We Liked:

  • Flow rate of 3 GPM, which isn’t a huge number, but is still enough to support simultaneous showers
  • With tiny dimensions and weight, it can be installed virtually anywhere
  • Saves a ton of space
  • The FVI-12-LP is considered a “point of use” unit, which means you can install more than one to amp up the power

The Rinnai V75iN HETankless Hot Water Heater is of high efficiency. It uses natural gas and is for installations which are indoor only. The flow rate of hot water given by it is up to 7.5 gallons per minute which varies according to the temperature of groundwater. It can provide your entire household with non-stop hot water. Now you can take a hot shower, do your dishes or even do heavy laundry without having to worry about running out of hot water.

The Rinnai tankless water heater features ThermaCirc360 technology that recirculates hotwater within your pipes to give you hot water quickly.While you have to wait for hot water to flow from your old tank into your shower, you can waste approximately twenty-four bottles of water every time. ─ that can be an average of about 8,700 bottles of water per person, per year.

With the Rinnai V75iN tankless water heater you can save valuable space. The compact design is great for installation in non-traditional spaces like the closet, crawl space, or the attic. You can save an area of about 16 sq. foot as the Rinnai tankless water heater is of the size of a small suitcase.

It can be run by a Control-R 2.0 mobile app that features schedules and timers throughout the day. Using this app the water heater can also be remotely put into vacation mode. It comes with a factory warranty of 120 months for the heat exchanger, 12 months for labor, and 60 months for the parts.

What We Liked:

  • Extremely efficient
  • Water-saving
  • Heavy duty
  • Energy saving


Set it and forget it! Control temperatures on your Stiebel Eltron Tempra 15 simply by turning a dial between 86 and 125 degrees fahrenheit. You’ll have an unlimited supply of hot water without disruption, and enjoy an average savings of at least 15-20% on the heating portion of your electric bill.


  •  Indoor
  • Minimum temperature (F): 86
  • Maximum temperature (F): 140
  • Weight: 1 lbs.
  • Dimensions: 2 x 19.2 x 9 inches
  • Heater exchange warranty: 7 years

What WE Liked:

  • Advanced Flow Control: This is one machine that knows how togo with the flow. Advanced Flow Control is exclusive to Stiebel Eltron machines. When you feel like cranking that hot water until it begins to exceed capacity, the Advanced Flow Control will — ever so slightly — reduce the flow of water to maintain that hot, hot, HOT water.
  • Intelligent Self-Modulating Technology: Increase your temperature, NOT your energy bill. This innovative technology uses the least amount of energy possible to heat your water, so that you can save money.
  • Ideal for homes with 1-1.5 bathrooms in warm climates, or 1 bathroom in cool climates
  • Easy to read digital display
  • Sleek and small, so you save space!

The Stiebel Eltron Tempra 24 plus electric tankless water heater gives a continuous flow of hot water. It features Advanced Flow Control a German patented technology invented by Stiebel Eltron, that for constant comfort automatically maintains the water temperature. It’ll decrease hot water flow slightly if the hot water demand exceeds capacity. There-fore your hot showers will be without any interruptions.

The Stiebel Eltron tankless water heater is an energy and space saver as well. Its sleek, small design saves space yet providing endless hot water for the whole house, and no vents are required. The eco-friendly unit preserves electrical power with auto-modulation and the capacity to electronically calculate water flow. It also has a savings monitor that shows how much you save on energy costs.

It is easy to operate.The electronic flow sensor switches on the powerful solid copper interior heating system of the water heater. While in use it’s noise-free and has a digital temperature display and preset temperature memory buttons.
This specific model of the tankless water heater uses 24kW and offers an output water temperature of 86˚ to 140˚F.
Stiebel Eltron’s top-rated electric tankless water heaters perform with the highest standards for comfort and reliability.

Focusing more on the price of such an item shouldn’t hinder you from enjoying the wonderful features this water heater has to offer. The Stiebel EltronTempra 24 Plus tankless electric water heated has a 7-year water leakage warranty and 3 years for any damaged parts, making it the best water heater in terms of the warranty. Other amazing features include digital temperature display, copper heating chambers and compact design.

What We Liked:

  • Constant hot water supply
  • Extremely efficient
  • Good warranty
  • Saves electricity
  • Saves space
  • Digital display


The Eco11 is Eco Smart and helps you to save water. Eco11 is tankless, and you can have an unlimited supply of hot water. You don’t need a tank to store it. The intuitive design heats water as soon as it’s on.

The tank turns on as and when you need the water hot. With these features, you can now save you money on water and energy bills. Eco11 fits in tight spaces or even easily mount it on the wall.

You can now save up on your floor space. It has an EcoSmart feature that enables the heater to use the required energy and cuts off. The temperature of the heater is digitally controlled.

Eco11 can heat up to 2 gallons per minute and requires an electrical panel of 125amp to install the heater. You can control and increase the temperature by 1 degree and heat water up to 105°F. It is ideal for temperatures that are 67°F and higher.

The heater can be used for multiple applications as well. When the climate is warm, you could use Eco11 in two sinks and one shower simultaneously. When it’s cold, you can use it in two sinks simultaneously.

The manufacturer offers a lifetime warranty on elements, exchanger, and electronics. The warranty covers the cost of the heater; incidental damages and labor are not included.

What We Liked:

  • Powerful performance
  • Easy to install and transport
  • Compact design makes this machine easily able to fit in virtually any space
  • Can provide hot water temperature up to 180 degrees Fahrenheit
  • Outdoor installation means that you have even MORE space indoors and prevents any chance of indoor water damage caused by potential (but unlikely) leaks
  • Powerful enough so that you can run a shower, dishwasher and laundry machine without ever losing hot water!

By Brands

RHEEM Tankless Water Heater


The pick for best overall choice in this brand goes to the Rheem RTG-84DVLN.

The one caveat that comes with this machine is this: if you don’t live in a moderate climate, you may not be able to expect the full 8.4 GPM that this machine boasts.

However, you can still expect a minimum of 5 GPM, which is plenty of power for you to run a shower, do dishes and even a load of laundry ALL AT THE SAME TIME!


  • Comes with a special low NOx system, so you can safely install this gas unit indoors without risk of harmful fumes building up
  • Relatively low price considering performance and brand
  • Can serve multiple bathrooms at once
  • Boasts a powerful 8.4 GPM


  • Weight: 54 lbs.
  • Dimensions: 14 x 10 x 26 inches
  • Maximum temperature setting of 120 degrees fahrenheit, which can be increased (via remote control) by 20 degrees if necessary
  • Energy star certified

TAKAGI Tankless Water Heater


Our pick is the Takagi T-KJr2, which is less than $500. The T-KJr2 has made more than one appearance in this review, and it’s easy to see why!

For Takagi Lovers we have also listed best Takagi Tankless Water Heaters have a look


  • There is no need for electricity when it comes to this machine. A natural gas heater, the Takagi T-KJr2 boasts a performance between 19,500-140,000 BTU.
  • Performs functions comparable to a 40-gallon tank heater.
  • Environmentally friendly.
  • Can last a minimum of 10 years.
  • Best for small homes with a maximum of two bathrooms.


  • Heat exchanger: Non-copper
  • Has remote control
  • Low NOx emissions


TheEcosmart ECO 18 Electric Tankless Water Heater is highly durable. It is easy to use. It is manufactured in China. It consists of copper and stainless steel components. For residential use, it has a lifetime warranty. You can save up to 60% of your water heating cost with advanced, self-modulating technology.

You will never run out of hot water with Ecosmart tankless water heater. It saves space compared to a conventional storage-tank water heater of up to 12 cubic feet. It has digital temperature control in 1 degree intervals give you complete control. It requires a 75A electric connection to operate.

The sleek look and spot-on display make this water heater a favorite among those in search of an environmentally friendly solution for their water heating needs. With the Ecosmart ECO 18 Electric Tankless Water Heater, you can heat 2.5 gallons per minute and can set temperature increments in 1 degree using the Digital temperature control.

This water heater saves energy and has a long lifespan compared to tank water heaters. Customers applaud how easy it is to operate.

The ECO 18 is able to heat two showers and two sinks simultaneously in warm climates, and a sink and shower simultaneously in colder climates. You can set the temperature anywhere from 80°F to 140°F.

RINNAI Tankless Water Heater


Our pick for best Rinnai goes to the Rinnai RUR98iN 9.8 Max GPM. Part of Rinnai’s Ultra Series, this machine comes with a hefty price. BUT, it’s worth it.

A big selling point of this model is Rinnai’s ThermaCirca360 technology. This technology provides an endless supply of hot water INSTANTLY (no wait time!).


  • Powerful 5 GPM
  • A special recirculation feature means you have an endless supply of hot water INSTANTLY without needing to wait for it to circulate your pipes
  • Provides maximum efficiency with a .96 energy factor
  • 12 year warranty


  • Dimensions: 5 x 10 x 26 inches
  • Weight: 6 lbs.
  • Indoor use only
  • Energy star certified

Bosch Electric Mini-Tank Water Heater Review


It is a hot water heater that’s convenient. It’s 2.5-gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it. The tankless hot water heater has a thermal efficiency is 98%. Its quality is long lasting. This electric water heater is easy to maintain and has premium glass-lined material for a long service life.

The installation of this electric water heater is an independent type. A 36-37″ cord plugs into a 120 volt outlet for independent installation or in-line with a large hot water source. It has a fast rate of recovery and hence eliminates long waits for hot water at your sink, get hot water on demand for your needs (supplies up to 2 sinks at a time)

It is easily mounted. It can be floor, wall, or shelf mounted (bracket included). You need to simply tap into the cold water line and install the water heater directly at the sink to provide hot water.

If you fancy a water heater that’s compact, lightweight and can be wall-mounted easily, the Bosch Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) is the ideal heater for you. Its 2.5-gallon capacity point-of-use fits perfectly in cabinet spaces and blends well with existing decor.

The glass-lined tank acts as a perfect insulator and provides added durability. Users love the high-energy efficiency and its ease-of-use in a wide range of locations.


  • Affordable compared to similar models
  • Comes equipped with a sensor that senses when a hot water tap is opened, so that it can instantly produce the amount of hot water required
  • A Piezo push ignition button modulates temperature in order to keep flowing patterns consistent
  • 3 GPM
  • Thermal efficiency of 78%


  • Dimensions: 5 x 18.5 x 36.8 inches
  • Weight: 4 lbs.
  • Indoor use only
  • Energy star certified

ECOSMART Tankless Water Heater


Making a second appearance in our review is the EcoSmart ECO 27


  • Powerful enough to supply a large home and even a jacuzzi
  • Self-modulating technology allows you to use the least amount of energy possible to keep your water hot without costing you
  • Unlike many comparable tankless heaters, the ECO 27 handles cold temperatures with gusto.
  • Once installed, the machine is extremely easy to maintain. You won’t need to call on a professional to flush and inspect the system.


  • Thermal efficiency of 99%
  • Not Energy star rated
  • Certified by Watersense
  • Voltage: 240 volts

EEMAX Tankless Water Heater


Our pick goes to the Eemax HA036240.

One thing I love, love, LOVE about this model is that it comes equipped with several smart features. A digital temperature control allows you to set temperature by 1 degree increments, with a range of 80-140 degrees fahrenheit. 


  • One of the most powerful electric models you can buy 
  • Continual flow rate of 7.5 GPM
  • Great for homes with 2-3 bathrooms
  • Copper heat exchanger ensures maximum efficiency
  • Compact, easily concealable and can be installed virtually anywhere
  • Durable
  • Prevents bacterial growth
  • Easy to install
  • Reduces calcification and sedimentation
  • Easy-to-use digital temperature display


  • Dimensions: 18 x 21 x 4.5 inches
  • Weight: 4 lbs.
  • Stainless steel



It’s difficult to pick just one tankless water heater and tout it as THE BEST, being that “best” really depends on your preferences and circumstance. To break it down, let’s look at which tankless water heaters are best depending on your household and usage.

For apartments, small homes, or places where everyone uses hot water basically NEVER:

If you want a quality tankless water heater, but don’t require a huge GPM, we recommend going with the Eccotemp FVI-12-LP. It’s small, inexpensive, and can still support simultaneous showers.

For the average household:


For the average household, we recommend the Rinnai V75iN. At less than $1,000, this compact machine is powerful enough to run simultaneous showers, and it also comes with safety features like built-in leak detection. PLUS, this machine easily operates in both warm and cold temperatures.

How Does A Tankless Water Heater Work?


To understand how tankless water heaters works, let’s first take a look at how traditional tank heating systems works.

Traditional tank heaters house a large amount of water, which is consistently heated at a certain temperature to ensure that you have water ready when you need it.

When you DON’T use hot water with a traditional heating system, something called standby loss occurs.

Unlike traditional tank heaters that keep water heated 24/7, tankless heaters provide hot water only when you need them to. This means that you avoid standby heat loss, which can theoretically reduce your energy bills (more on that in a bit). 

When you initiate the tankless system, water is heated either through electricity or gas heat, providing hot water INSTANTLY.

How exactly is this done?

Tankless water heaters use heat exchangers.

A heat exchanger is a device that transfers heat from one source to another. In the case of tankless water heaters, heat exchangers transfer heat generated by electric coils or a gas-fired burner to the water that comes out of your faucet. Upon turning on your hot water tap, the incoming water will circulate through this exchanger and heat to your preset temperature.



Traditional vs. Tankless

As far as convenience goes, many home garages and basements already have tank water heaters. These are actually less expensive and more convenient to install than tankless water heaters.

A tank heater also requires less maintenance, whereas many tankless heaters need a professional to come out once a year to flush the system of calcium deposits.

That being said, despite their compact size, tankless water heaters definitely prove that powerful things can come in small packages.

That is…until your power goes out. Whereas, with a regular tank, you’ll probably have 50 gallons of hot water, so that you can at least get a couple showers out of it.

Still, there are several benefits to getting a tankless water heater, depending on your home and preferences. Let’s break it down further, shall we?


If you’re going to purchase a tankless water heater and want to further cut down on your initial costs, it may be good to install it yourself if you’re handy or KNOW someone handy.

According to HomeAdvisor, the average cost of tankless water heater installation is $1,774, with a typical range being between $910-$2,641. Now, if you just have a huge chunk of change lying around that you won’t miss, BY ALL MEANS, get a professional to install your tankless water heater, and enjoy some caviar while you do so, my rich friend. CHEERS!

Several tankless water heaters can also be up there in the four-digit range when it comes to price.

Gas vs. Electric

Tankless gas heaters still require electricity to power the PC board, which is the brain of the heater, and the digital remote. Also, since there is no stand-by pilot light, it uses an electric direct ignition. To break it down, gas heaters:

  • Typically cost less to operate
  • Have a higher initial cost than most electric heaters, and they are also pricier to install
  • Non-condensing units may cost less initially, but installation costs tend to be more significant
  • It may take a year for you to see a return on investment energy bill-wise

If you use electric to heat your water, this is where you may see the most significant drop in your bills when going with tankless. Installation costs remain high, but many of the most popular and reliable models tout a price tag that is quite reasonable. To break it down, electric tankless heaters:

  • Are 99% efficient
  • Do not qualify for energy star ratings, which require a product improve energy output 14% over older models
  • Both upfront and installation costs tend to be lower than gas models

Reasons to Go Tankless

As noted, when it comes to tankless water heaters, the touted savings can be defeated. Still, there are a few key benefits that tankless water heaters (both gas and electric) have over traditional tank heaters. 

Luxury: With tankless heaters, you have limitless hot water. This means that you needn’t worry about being forced to take an Antarctic shower after others in your household have used up hot water.


Better for the planet: Go green! Tankless water heaters are made with technologies that are designed to reduce carbon emission in the air. And because you will only be using hot water when you need it, your carbon footprint is further reduces.

Space considerations: Tankless water heaters are extremely compact, with many fitting virtually anywhere. Plus, they can be mounted to the wall, which saves you plenty of floorspace. AND, if you live in the south, you can have your heater stored outside, so that you won’t even have to LOOK at the heater (although some are quite easy on the eyes).

Lifespan: If you properly maintain your tankless water heater, it stands to live anywhere from 20 to 25 years (WHOA). Conversely, conventional tank heaters tend to live a maximum of 10 years.

Smart water: Many tankless machines come with smart technologies, like remote controls and self-modulating devices.

Safety: Many tankless water heaters come equipped with technologies to prevent leaks or bursting



Wait, don’t leave just yet! Here’s one more consideration for you when purchasing a tankless water heater.

Did you know that you could be using more hot water than you need?

If you shower every day, then you are using TOO MUCH, according to experts. Showering every day:

  • Strips your hair and skin of essential oils needed for softness and health
  • Wastes water. According to the United States Environmental Protection Agency, the average family of four uses 400 gallons of water per day!
  • Strips away protective bacteria that you NEED to keep out toxins and chemicals

So how often should you shower?

About every other day is what experts recommend. And, although several of us may enjoy using shower time as meditation time (there’s just SO MUCH to think about in there), it’s best to limit your shower time to less than 30 minutes.

And, hey, less showers is just one OTHER way to save on energy bills.

Happy showering!