10 Best Tankless Water Heaters to Savor the Experience of Hot Water

Many homes today have resorted to the use of best tankless water heaters for their hot water needs. This is because these types of water heaters are very convenient, timely, and easy to work with. By just the press of the ignition button you’ll be enjoying the warm heat of a cool refreshing bath.

Top Tankless Water Heaters Comparison





Rheem RTE 13 Electric Tankless Water Heater


Ecosmart ECO 18 Electric Tankless Water Heater


Ecosmart ECO 27 Electric Tankless Water Heater


Eccotemp L5 Portable Tankless Water Heater


Rheem RTE 9 Electric Tankless Water Heater


Atmor AT-900-03 Tankless Electric Instant Water Heater


Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater


Takagi T-KJr2-IN-NG Indoor Tankless Water Heater


BOSCH T 2.7-Gallon Electric Mini-Tank Under Sink Water Heater


Eccotemp FVI-12-LP High Capacity Propane Tankless Water Heater





Today choosing the best tankless water heater requires you to scout through a number of options. Here are some the top rated tankless water heaters that we have sampled for you and which you could choose from.

Recommended Tankless Water Heaters Reviews

Rheem RTE 13 Electric Tankless Water Heater

For a home owner who wants an on-unit temperature control for their tankless water heater, the Rheem RTE 13 Electric Tankless Water Heater is the perfect match for the job.

LED Panel That Will Indicate Active Elements

Typically this best seller tankless water heater has so many features to die for. Apart from an on temp control, the Rheem RTE 13 comes with an LED panel that will indicate active elements and standby mode.

Standard Half Inch Water Connection Option

It also comes with a standard half inch water connection option and a rugged heater changer that can either come in brass or copper depending on the choice of the user. The Rheem RTE 13 is thus a cool option.

Self Power Modulation Option

But what makes the Rheem RTE 13 qualify as a highly rated tankless water heater? This hydraulic heater also has the ability to modulate power. In addition to that it has many other ideal specifications that are great for:

  • Single shower application
  • GPM Maximum flow rate.

Easy to Operate/ Comes with a Manual

The item is easy to operate and comes with a user manual that one can easily refer to. The item is also an easy option to install as it only weighs about 7.3 pounds and measures 7.2 x 7.2 x 7.2 inches and thus takes very minimal space.

High Energy Efficiency

It is energy efficient and will use very minimal energy when connected to your power system. However, to minimize power use, insulate your pipes. Regulate also the amount of showers you take in a day and install small head showers.


  • Energy Efficient
  • Single shower application
  • GPM Maximum flow rate.
  • Temp control options
  • LED Control panel


  • Uses more power if connected to un-insulated tank
  • Can easily get damaged if mishandled by user.
  • Failure to use the manual means damage.

Ecosmart ECO 18 Electric Tankless Water Heater

Just like the Rheem above, the Ecosmart ECO 18 Electric Tankless Water Heater is cool for someone who needs an 18 KW at 240 volts water heater for their home.

Self Modulating Technology

This water heater is actually a very cool option to go for. We found out that it has so many cool features that any home owner would simply die for. First it is patented with self modulating technology.

Save Up To 60% Of Your Water Cost

Additionally the product is highly durable and very easy to use. Manufactured in China, the Ecosmart ECO 18 is designed to save up to 60% of your water cost with this modern self modulating tech.

Saves Up To 12 Cubic Feet Of Storage

It also saves up to 12 cubic feet of storage space and its digital temperature control in 1 degree increments leaves users with easy control of their hot water. The tankless water heater is but a little weighty though.

Weighs Only 14 Pounds

Compared to the Rheem above, this water heater weighs 14 pounds and measures just about 20 x 20 x 6.5 inches. Meaning it consumes a little bit more space compared to the other perfect tankless water heaters.

In overall, if sized properly, this tankless water heater will save you money, cut down on the heat loss, and eventually saves you up to 50% of water heating costs. It has a digital temp control system and easy to replace elements.


  • Advanced self modulating technology
  • Digital temperature control
  • Easily replaceable elements
  • Comes with an installation manual


  • A little bulky compared to the rest
  • Needs more space during installation
  • Ideal care and maintenance to avoid damages.

Ecosmart ECO 27 Electric Tankless Water Heater

If you live in a home that needs less hot water use, the Ecosmart ECO 27 Electric Tankless Water Heater is a smart option to choose from.

At only 27 KW at 240 V, 112.5 Amps, the Ecosmart ECO 27 Electric Tankless Water Heater may not be quite as its sister seen above but its pretty much ideal for a sizable family.

Comes With A Digital Control

It comes with a digital control in 1 degree increments that provides easy control of the hot water. Additionally the Ecosmart ECO 27 is also designed with copper and stainless components to improve on efficiency, durability, and easy replacements.

Saves Valuable Storage Space

Its compact size allows it to save valuable storage space while also appealing with its stylish and advanced design.

Self Modulating Technology

The model is also fitted with patented self modulating technology that provides many water heating options for a sizable home use too.

Prior to buying the Ecosmart ECO 27 it is usually advisable that you verify if the model functions with your electrical capacity. Usually the main elements required include 27 KW, 240 V, single phase supply, 3 x 40 breakers, and 112.5 amps.

Configured For Cold Climates/ High Flow Rates

It is also configured for cold climates/ high flow rates and the incoming water can drop up to 45 F. The digital display also shows the outlet water temperature settings making it pretty efficient for energy saving options. Has an automatic re-settable thermostat.


  • Self modulating flow sensor technology
  • Digital temperature display
  • Copper heat exchanger
  • Energy saving options


  • Weighty compared to other heaters
  • Requires more space to install
  • Easily damages if proper instruction is not followed.

Do you love an easy lifestyle for your hiking spree, mountaineering, or camping errands? You don’t have to bear the cold of the morning, no! The Eccotemp L5 Portable Tankless Water Heater will have your back.

Highly Portable and Easy to Use

Designed to give hot shower like any other tankless heater, the Eccotemp L5 Portable options like the name suggests, can be tagged along. This makes it a great option for the next outdoor shower that you are looking at.

Propelled By Liquid Fuel with 2D cell battery ignition

It is a 1.4 GPM portable tankless water heater that’s propelled by liquid fuel. It has a 2D cell battery ignition and a minimum flow rate of about 0.3 liters per minute. The water heater also needs 20 – 80 PSI of water pressure.

Master Lightweight Heater

The great thing about this water heater is that it’s a master lightweight heater. At only 13 pounds the Eccotemp L5 Portable travels easily on trucks, barns, cabins, and almost to any location. I have used it quite a number of times to rinse off at the beach.

Automatic Ignition

What else makes it a highly rated tankless water heater? It is easy to operate. It has an automatic ignition that’s allows the burners to come on as soon as the water flows through. It also has many options to go for including multiple spray settings to choose from.

The heater gives temp range of between 80 – 150 F starting at 0.5 gallons per minute flow rate to 1.4 gallons. Finally one more cool addition is, after 20 minutes the heater shuts off automatically.

Too bad the 2D cell batters that the heater requires are never included. The heater is also recommended for outdoor usage only. It also needs a water source (tap) to function properly.


  • Highly portable and suitable for all outdoor functionalities.
  • Requires between 20 PSI to 100 PSI of water
  • Uses Liquid Propane Fuel (easily accessible).
  • A Great backup when there is power outage.


  • The 2 D cells batteries for ignition not included
  • Limited to outdoor usage only
  • Needs a water source to operate efficiently

Another one of the on unit temperature control water heaters, the Rheem RTE 9 Electric Tankless Water Heater is highly suitable for any sizable family.

The water heater comes with very many features that make it highly efficient for any medium sized home use and much more.

LED Control Display

First it comes with an awesome contemporary design that incorporates a LED control display that indicates active elements and standby mode whenever applicable.

Fitted With Rugged Brass/ Copper For Heat Exchange

Additionally this module of the recommended tankless water heater is fitted with rugged brass/ copper for an efficient heat exchange process. And while it is set at 3 GPM, the heater comes with self modulating power options that’s adjusts depending on how much energy is needed.

Automatic Resettable Thermostat

The heater also has an automatic resettable thermostat that makes it pretty easy to operate. It is easy to set up but requires slightly larger space as it weighs only 7.8 pounds and measures 7.2 x 7.2 x 10 inches.

Allows For Half Inch Water Connection

It also allows for half inch water connection and only uses 9 KW, 240 V, and 40 amps at maximum. This water heater is ideal for point of use applications. It has a compact design and will save space, energy, and give you hot water on time for your needs.

However the only reason this hater might disappoint is using a quack to install it, not following the user manual, poor or lack of proper care and maintenance, and overuse.


  • Fitted with a LED display for active elements and standby mode
  • Fitted with rugged brass and copper for heat exchange
  • Comes with self modulating power options
  • Has an automatic resettable thermostat


  • Easy to damage when proper instructions are not followed.
  • Won’t work with low power supply or energy supply
  • A little weighty compared to other tankless water heater models.

Atmor AT-900-03 Tankless Electric Instant Water Heater

The best of its kind, the Atmor AT-900-03 Tankless Electric Instant Water Heater requires very limited energy to work and serve your needs efficiently.

Highly Energy Efficient

Of all the editor's choice tankless water heaters that we have seen above this is the only design that requires 3 KW and 110 V. Its minimum activation rate (gpm) stands at 0.5 unit weight lbs. It needs 27A and is equipped with overheat protection.

Ideal Wall Mountable Options

The water heater also comes with an ideal wall mountable options; it uses a single phase and minimizes the use of space. For any home without so much hot water needs, the Atmor AT-900-03 would be the perfect choice for a great experience.

A Super Lightweight Machine

In fact the water heater is pretty light and weighs just about 4 pounds. It measures 11.9 x 8.7 x 4.2 inches and would be the best option for a minimum space such as a cabin. In the US this has been used by many homes as the main source of instant water heating needs.

Eco Friendly And Efficient

Additionally the Atmor AT-900-03 is also eco friendly, efficient, and highly convenient for residential and commercial applications. It comes with an elegant design, a white color that blends with almost every design that you could need for your home.


  • Mountable against the wall
  • Energy efficient (uses less power)
  • Equipped with overheat protection


  • Requires proper care to prevent damages
  • Could damage without proper use of instructions
  • Not quite easy to install if you are a quack

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

Until last year I hadn’t tried the Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater. Obviously it didn’t occur to me that it was such a cool option. Finally I did and I had to sample it on this list.

Ideal for Residential And Commercial Use

The Rinnai RUC98iN Ultra Series comes with super cool features for both residential and commercial use.

PVC Venting Option

This top rated tankless water heater comes with a PVC venting option. Additionally it also comes with a space saving design that allows for easy installation anywhere.

A Little Weighty but Durable

However for a super cool design the Rinnai RUC98iN Ultra Series weighs extremely on the higher side. At about 82 pounds in weight, this design would mean extra work when it comes to mounting the heater against the wall or somewhere across the floor.

Highly Energy Efficient

For its operations and user-ability the water heater is however much of a cool option for any heating needs. First it is great for saving energy and features 95% thermal efficiency natural gas or propane indoor installation.

However the 98° F to 140° F Residential Temperature Range and 98° F to 185° F Commercial Temperature Range Controller Must be Purchased Separately; that’s not cool but for anyone who wants the cool benefits of the Rinnai RUC98iN Ultra Series that’s not a big issue to jump.

The Rinnai is also highly compatible with a condensing horizontal termination kit and a condensing vent pipe extension. Most buys who get it will definitely grab either of these two.


  • Energy efficient
  • Uses limited space
  • Ideal for commercial and residential use


  • High maintenance costs
  • Comes with no temperature range controller
  • Damages easily in case of improper use

Takagi T-KJr2-IN-NG Indoor Tankless Water Heater

Measuring slight about 6.7 x 13.8 x 20.3 inches, the Takagi T-KJr2-IN-NG Indoor Tankless Water Heater is the newest kid on the block for simple homes that require the comfort of a continuous supply of hot water on the lower rates.

6.6 GPM Flow Rate

The model that works with about 140000 BTUs has a 6.6 GPM flow rate and requires a 4 inch category III stainless steel venting.

Inlet And Outlet Thermostats

It comes with an inlet and outlet thermostats for constant temperature monitoring. The heater weighs 37 pounds slightly below the heaviest models that I have included in this category. It is a non-condensing gas tankless heater.

Highly Energy Efficient

The model is highly energy efficient and would fit any medium budget for a middle sized home or family. It is also ideal for commercial use.

However for a digital water heater, it’s a turn off to find out that the Takagi T-KJr2-IN-NG Indoor Tankless Water Heater has no LED display for easy settings and readings.


  • Very much energy efficient
  • Ideal for residential and commercial use
  • Comes with inlet and out let thermostats


  • Comes without an LED display
  • Needs constant setting and monitoring
  • Harder to operate and install compared to other models

BOSCH T 2.7-Gallon Electric Mini-Tank Under Sink Water Heater

Unlike the many models that we have seen in this list today, the BOSCH T 2.7-Gallon Electric Mini-Tank Under Sink Water Heater is the most unique one.

2.5 Gallon Point Mini Tank

Ideal for small homes the BOSCH T 2.7 operates almost like a heating kettleJ. However it has a 2.5 gallon point of use mini tank.

Easy To Install And Operate

The tank can easily fit under your sink or anywhere that you need it and still provide you with the hot water including the shelf, wall, or floor. It comes with an easy to use bracket that you can mount t with. The BOSCH T 2.7 is pretty easy to maintain.

Glass Lined Tank

In order to last longer the heater comes with a glass lined tank. It can be used with a 120 V outlet for independent installation. It can also be used in line with a large hot water source.

Extremely Small and Highly Portable

This model is the smallest in its series. It has a great recovery rate that eliminates long waits for the next hot bath. However the heater is a great addition as it comes with an external dial that will allow the user to easily control the temperature range.

Pressure Relief Valve

For maximum safety, the heater comes with a temperature and the pressure relief valve. The Water Heater which measures 13.75" H x 13.75" L x 10.75" in dimensions however is not ideal for commercial use or residential use for large families.

Irrespective of all that, it weighs just about 15 lbs making one of the most deal and highly portable tankless water heaters in this category.


  • Easy to move around
  • Equipped with temperature and the pressure relief valve
  • Great recovery rate that eliminates long waits
  • Glass lined tank for high durability


  • Small in size could need more trips
  • Not ideal for commercial purposes
  • Need constant care to avoid any damages?

Eccotemp FVI-12-LP High Capacity Propane Tankless Water Heater

Like a few other recommended tankless water heaters that we have come across, the Eccotemp FVI-12-LP High Capacity Propane Tankless Water Heater is elegant and pretty ideal for both residential and commercial use.

Works with Half Inch NPT Fittings

It has a number of features that guarantee its efficiency. Some of these cool features include its ability to work together with half inch NPT fittings; making it one of the most economical tankless water heaters that we have today.

Sleek Modern Design

In addition to that, the water heater also comes in a sleek modern design that allows it to flawlessly blend in with any home décor that you have put in place. It’s not only for its natural hue the simple design also makes it easy to fit in.

Power Ventilation

It comes with power ventilation for guaranteed safety and efficiency and operates at 74500 BTU’s. Like many other digital tankless water heater, the Eccotemp FVI-12-LP also comes with a digital temperature display with a fully independent gas and water control.

Weighs 33 Pounds

It weighs 33 pounds slightly below the heavier models, and measures just about 4 x 15 x 24 inches in dimension. The heater only uses energy when the water is turned on.

Delivers 3 Gallons Of Hot Water Per Minute

It delivers 3 gallons of hot water per minute and has a safe electronic ignition system. Additionally the heater also has a digital thermostat. However the heater can easily get damaged if mishandled.


  • Comes with a digital thermostat
  • Has digital temperature display (independent gas and water control)
  • Sleek modern design for contemporary homes


  • A little heavy
  • Easy to damage of mishandled
  • The ignition can easily breakdown.


In order to choose the most convenient water heater you should look at your budget, find the price of the tankless water heater, ask around from loved ones and experts and choose the best tankless water heater for your use.

Having prior knowledge is usually an added advantage that many water heating experts recommend that you should have before stepping in any hardware to buy a heater for your use.

Joe Carrow

Product reviewer & passionate blogger. Beside writing for this blog, I spend my time crafting research based contents for HuffingtonPost, Lifehacker & Forbes!

Click Here to Leave a Comment Below 0 comments
Web Analytics