Top 10 Tankless Hot Water Heater Reviews – EcoSmart, Takagi, Noritz and more

Tankless Water Heater: It’s surprising to note that it takes almost 20 percent of the entire household budget when it comes to heating water. This is ranked second to what you usually spend on cooling and heating your household. Nevertheless, water heaters are generally disregarded until they are broken down thereby leaving people with no hot water during a harsh cold climate and even facing a future scenario of a basement which is flooded.

If you happen to have a tankless hot water heater which is almost at its end and you are considering purchasing a new one before you face a disaster then you will be certainly glad to hear that you have multiple choices when it comes to selecting the best tankless electric water heaters since the current federal rules stated that all the tankless hot water heaters to be more energy-efficient. In fact, brand new storage tank water heaters are produced to function more efficiently thus making tankless water heaters (on-demand) to be more efficient in comparison to them.

Best Tankless Water Heater Reviews 2019

Generally, people try to exchange their former water heater with another which is of the same type that operates on either electricity or natural gas. Moreover, shifting from a tank water heater to a tankless heater unit can be exorbitant since you would need to change your electrical and maybe even your plumbing system. However, if you’re constructing a new home from scratch or even implementing the unit to an existing one then fixating a best tankless electric water heater seems to make more sense in terms of cost.

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Top 10 Tankless Hot Water Heater Reviews

  1. Rheem RTEX 13 residential Water Heater
  2. Rinnai RUC98iN Water Heater
  3. Takagi Tankless Water Heater T KJr2 Indoor Tankless Natural Water Heater
  4. Titan SCR2 N-120 Tankless Electric Water Heater
  5. Eccotemp L10 Portable Outdoor Water Heater
  6. Atmor AT D18TP AZ ThermoPro Electric Tankless Water Heater
  7. EcoSmart ECO 27 Tankless Hot Water Heater
  8. Noritz Tankless Water Heater NRC98 DV NG Direct Indoor
  9. Stiebel Eltron Tempra water heater Self Modulating Tankless
  10. Rinnai RL75eN Natural Water Heater Tankless

Rheem RTEX 13 residential Water Heater

The Rheem tankless residential water heater unit is a remarkable product which offers exciting features which can support your heating needs. As a matter of fact, it features an adjustable, smart digital thermostatic control which is fixated outside the unit and comes with a bright LED display which has a +/1 degree precision.

Moreover, the model guarantees 99.8% efficiency when it comes to using and saving energy. Wherein, you can adjust the temperature using external controls in accretions of 1°f. Also, the model comes with a shower head which flows at a rate of 1.5 GPM, therefore, conserves water usage as well. This is certainly a beneficial unit to those who aim to cut down costs significantly.

Other great features include two long-lasting heating elements which are produced out of copper immersion. Users can expect to avoid frequent maintenance costs and repairs in the near future. The model comes with an independent power control which can easily be adjusted by the user.

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  • Simple setup and installation.
  • You would save a lot of costs since this model utilizes energy efficient features.
  • Self-adjustable digital temperature.
  • Perfect hot water temperature in cold climates.

  • If the water flows through the heater too quickly, then it won’t get heated to the certain temperature as expected.


Rinnai RUC98iN Tankless Water Heater Review

The Rinnai unit takes water heating to next level since it employs condensing technology which provides 100% efficiency compared to other models. Featuring PVC venting or concentric option, the model delivers an equal energy factor up to 0.92 and a regular energy factor up to 0.92.

The model is being built to have a design which conserves space thereby enables easy installation within the home itself. Users can benefit from this model since it encourages an extremely low amount of emissions being released into this atmosphere. This is certainly an environmentally-friendly product which can save costs, energy and promote a healthy environment.

Despite its compact size and smooth design, a water heater is a heavyweight unit. Moreover, it contains an exterior material produced out of gunmetal grey with the controls being situated on the front panel’s bottom lip. On the control panel, you can find the water temperature, a digital display, a power button, and buttons to adjust as well as control gas. Apart from adjusting the hot water temperature being released from the unit, you can even lock the temperature switch in order to avoid unofficial access.


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  • Compact and sleek design.
  • Efficient when it comes to using energy and water.
  • Precise temperature control.
  • Unlimited hot water access.
  • Easy to understand and informative manual.

  • Time-consuming when it comes to heating the water up.
  • Minuscule dip in terms of water pressure.


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

The Takagi tankless water heater T-KJr2-IN-NG holds a 40 gallon capacity of water wherein it proves to be one of the most astounding water heaters in the market. The space needed to install this compact yet efficacious water heater is not as huge as you think, however, the performance results are expected to be positive and large. Also, the flow rate is nearly 6.6 gallons of water per minute.

Effective Temperature Check: The unit integrates a potent temperature control which ensures the working system carries out the water flow and transfers it through thermistor chambers. This will enable the unit to keep track of the temperature at all times.

Furthermore, the air-fuel ratio sensor helps to monitor and avoid substantial emissions of dangerous pollutants and toxins. Other than this, there are several safety specifications included such as the freeze protection, the surge breakdown protection, the digital meter protection where it supports in causing reduced and lower failure rates.

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  • Lightweight and compact
  • 6+ gallons of hot water released per minute at the perfect temperature
  • Easy to install

  • Need to install flexible gas and water valves
  • Need to wait around 5 seconds at first in order to receive hot water


Titan SCR2 N-120 Tankless Electric Water Heater

This unit is known to be very cost-effective since it makes use of electric power at a minimum level. Wherein, its extreme-advanced device can operate really well and at the same time use fewer amounts of power and voltage. Due to its smart self-adjusting technology, it helps in decreasing levels of energy consumption by 50 percent (maximum) since it can sense the rate of water flow and detect whether if the shower heads are either on or off.

This model can be used for countless amounts of purposes in more than one room. Also, being powered by 220 volts with 54 amps, it instantly heats up the water with a hertz capacity of 50/60 Hz in 11.8 kW.

You can effortlessly fix this model anywhere and control is easily due to its basic system. The outer layer is well shielded thus you can expect less heat exposure being released. Lastly, this machine is a completely automatic controlled system.

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  • Instant hot water available.
  • The water temperature can be easily controlled and there are few cases of overheating found in this system.
  • Operation of this model is very economical since it consumes less energy.

  • Overheating can occur if the user does not turn off the switch after use
  • Highly Priced
  • For cold countries, the water heating process may take some time to start


Eccotemp L10 Tankless Portable Water Heater

The Eccotemp tankless water heater is a great unit to help you and your family unwind and relax since you all you ever need sometimes is a soothing hot shower. The model is easy to carry and extremely lightweight thus making it perfect for grid-use, camping, outdoor showers and even washing your pets.

The model operates on a liquid propane tank with a standard of 20 lb. which is supplied with electronic ignition. Also, the water heater is being charged with 2 “D” cell batteries thus making it suitable for the on-the-go journey. There is a safety shut off feature which is automatically switched on when the unit does not function more than 20 minutes or if it’s tilted about 45 degrees in either direction.

You can expect hot water output of an ideal temperature range of 50-140 degrees F with a 2.6GPM. Furthermore, it is engineered with a low-pressure activation of 20 PSI and is certainly easy to link to any conventional garden hose.

Eccotemp L10 Tankless Portable Water Heater

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  • Automatic shut-off feature after 20 minutes
  • Temperature controls are easy to use
  • Compact and lightweight
  • Great for camping and many more

  • Not so consistent when it comes to sustaining a steady water temperature


Atmor AT D18TP AZ ThermoPro Electric Tankless Water Heater

The ThermoPro electric tankless water heater unit is a beautiful model which will help you save up to 50% on electric expenses than compared to a normal tank water heater.

You would get features such as a digital temperature control which enables you to preset your temperature in accretions of 1°. As a note, the thermostatic control has a range from 90 to 135°f. This allows users the freedom to change the temperature accordingly and when necessary.

Moreover, the interior which is produced out of stainless steel is resistant towards corrosion as well as long-lasting therefore promoting durable life expectancy and encourages heat efficiency. Being charged up at a power of 75 amps, the model is engineered to heat up flowing water as low as 37F at a rate of 1.9 GPM.

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  • Installation was easy to set up.
  • The model was created using high-quality material, therefore, it is a sturdy product with durability.
  • Provides consistent heat temperature regardless of how long the unit seems to run.

  • The model powers up to 100 amps maximum, therefore, you need to ensure that your electric service has adequate amps to support it.


EcoSmart Tankless ECO 27 Water Heater

The EcoSmart tankless water heater is designed to save up to 12 cubic feet when it comes to storage space. You can easily fit this model in your home without worrying about taking too much space. Also, you can now enjoy unlimited soothing hot water during harsh cold climates and even save up to 50% on costs which incur on heating the water. Its respective dimensions are: 17h x 17w x 3.625d inches and the pipes are designed around 3/4 inches NPT.

In terms of energy, the model operates by using about 200 amps of energy and would need a three 40 amp double pole breaker quantity. Other impressive features include a user-friendly digital temperature control with 1-degree increment buttons which enable direct control access of hot water.

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Coming to the material construction, it is produced using stainless and copper elements which are being used to encourage durability, efficiency, effortless replacement when needed. This offers an assurance to the users that the model is, in fact, great in the long run and will certainly help you in heating up the water instantly and effectively. Furthermore, the compact size helps in preserving crucial storage capacity and is developed as an aesthetic, modern and stylish design which is certainly appealing to the eye.

EcoSmart ECO 27 Water Heater

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  • Instant hot water received.
  • Easy to set up.
  • Saves ample amounts of space.
  • Using self-modulating technology, it conserves a lot of energy.

  • The technical service provided is of substandard quality.


Noritz Tankless Water Heater

The Noritz Tankless NRC98-DV-NG water heater unit releases a direct 9.8 GPM flow of water and is suitable for indoor purposes. This model takes efficiency to the next level and even promotes effortless installation as well as a higher capacity range. The condenser enables you to fixate the system in tight indoor spaces. Nevertheless, the beauty to realize here is that you do not need to comprise and struggle when fitting the combustion.

The unit delivers high levels of efficiency than that of a regular tankless hot water heater especially when it comes to replacing a current heater at extremely low costs. The water heater is produced out of copper material (commercial-grade) which tends to provide a thermal efficiency of 93%. Simultaneously, it reduces exhaust temperatures and carbon emissions significantly. It is engineered to have standby losses at a minimum and even combines an electronic ignition thus signifying not a single standing point.

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Even so, the gas consumption range lies somewhere between 16,000 BTUh to 180,000 BTUh. Lastly, the model integrates a quick-connect cord which enables you to join two similar units together and control both of these units by using a single controller system. Due to this merger, several heaters can be linked thus release higher outputs of hot water. The smart temperature control includes a remote thermostat which can accurately set the output temperature from a region between 100°F to 140°F.

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  • It provides an extremely efficient service along with a thermal efficiency up to 93%. In addition, it delivers an energy factor of 0.94 Propane and 0.92 Natural Gas.
  • Being designed to bring you low-pressure loss and consistent temperature control.
  • It has a high flow rate for small to medium homes with from below 1 GPM to 9.8 GPM.
  • The installation is flexible and versatile with CPVC and PVC piping since these plastic pipes make use of low-priced zero clearance which allows durable vent extensions up to 62 ft (lengthwise).

  • It is time-consuming and difficult to install the model as a DIY so it is necessary to hire a technician who is a professional when it comes to working with water heaters.


Stiebel Eltron Tempra Tankless Hot Water Heater

The Steibel Eltron Tempra unit is being produced to showcase powerful output, a sleek yet compact design, and bewildering features which conserves a lot of energy. This remarkable unit is created to carry out top-notch standards when it comes to reliability and comfortability. Also, it integrates a smart self-adjusting technology which operates constantly in order to bring you sufficient amounts of energy which is used to heat up the water.

This model would require a 208 or 240-volt electric charge and functions at an optimum output of 21,600 watts of 208 volts or even 28,800 watts at 240 volts. In addition, the digital temperature display is a great feature since it shows an easy-to-read and precise temperature control along with the highest energy efficiency being used. Users can be notified of the current temperatures and figures when using the water heater. The Steibel Eltron Tempra heater offers hot water at a consistent temperature to a maximum of 3 bathrooms during warm weather conditions and 2 to 3 bathrooms during the cool climates.

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  • Temperature readings are accurate and easy to read.
  • No reduction when it comes to the flow of water.

  • Cannot be installed as a DIY method and would require the assistance of a professional technician.


Rinnai RL75eN Tankless Gas Hot Water Heater

You can now enjoy the amazing experience of an unlimited fresh supply of hot water, along with a compact and sleek tankless water heater design. Regardless of building a new home or even remodeling your current home, the Rinnai RL75eN unit is constructed in order to provide all the hot water needs.

This model can be positioned anywhere in the room or can be mounted directly outside and can include a combined condensate collector. This would be beneficial to the user since he/she does not need an extra vent wherein it can be even be set up in a tight enclosure

It is important to note that the water heater uses a silver finishing as an outer layer with the sculpted cover. One of the biggest concerns with a gas water heater is the venting system. Apart from taking a lot of space, they also seem to leave a hazardous environment. The tubes and pipes start hanging out from the machine. This issue is solved by the Rinnai RL75iN. It lets the vent out of the way by using a single wall penetration. You can position this model in any room you desire.

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When it comes to efficiency, the water heater unit is highly energy efficient and has even obtained an Energy Star certification for its dynamic technology which is created to conserve energy. The system does not make use of electricity supply in order to generate hot water. By using natural gas, the minimum gas rate is around 10,300 BTU. The maximum gas rate is about 180,000 BTU. Additionally, the unit features a digital controller along with an error code alert which informs the users of any potential problems so that it could be looked into and solved immediately.

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  • Unlimited hot water facility.
  • Compact design hence does not take too much space.
  • Users can dial in the desired temperature.
  • Highly efficient wherein you can use the water heated only and does not heat up the entire water tank.

  • Highly-priced
  • Installing the vent and the unit involves complicated processes
  • Need to purchase additional parts in order to use the model commercial purposes

Things to consider while choosing the best Tankless Water Heater

As we have reviewed the top 10 best tankless water heater systems, let’s take a glimpse on some of the most crucial features which everyone should know about before purchasing a water heater.

Main features to consider

High energy efficiency

Energy efficiency is a term which has taken the whole appliance realm by storm since there have been talks in order to encourage more people to purchase efficient and renewable energy appliances.

Try seeking out for models that offer high-efficiency rates. Also, there are several models which operate without a storage tank since electricity is used only when the warm water is being released from the sink, therefore, enabling consumers not to pay for more than they usually use.

On-demand heating

There are some tankless electric water heaters which assure quick warm water. But not all of them can provide so soon. That is why we recommend looking for models which have inbuilt thermo optical sensors. They are being built to provide warm water when necessary. Moreover, as stated by Energy Saver, water heating comprises around 18 to 20 percent of the entire utility expense.

Shields you against disease

Since storage water heaters have an idle tank during the day, it starts accumulating stagnant water. This will make it prone to bacteria buildup from both inside and out areas. Thus leaving the members in the household at dangerous risk. In addition, some of these dangers include Legionella bacterial growth which happens to grow in motionless, warm water.

This is why we suggest opting for an electric tankless hot water heater. Because it does not make use of a tank. Therefore, eliminating the chance of water sitting still in the system and further eradicating the potential growth of bacteria. Water flows directly from the pump, transfers through the system and pipes, and finally is released at the faucet.

Water Heater Types (Tankless Vs Tank Water Heater)

Well, depending on the amount of hot water you tend to make use of and which method you use to heat up the water i.e. electric or gas, you will obtain a host of options. There are a few types which have declared to reduce energy expenses up to half than the standard storage models. However, their extra up-front costs would indicate a higher payback time period. We’ll be looking into 2 types of water heaters and move onto tankless heater units due to their on-demand usage.

Storage Tank Water Heaters

These tanks are the most customary and commonly used in the world of water heaters. As per the name, these basically include an insulated tank of which the water is heated and conserved till use. If needed, the water stored will be released from a pipe onto the top area of the water heater.

In addition, it comprises of a pressure-relief and a temperature valve. It opens if the temperature or pressure levels exceed the pre-defined level. Typically, water heaters which make use of natural gas utilize less energy. Also, they cost way less to operate (by about half) than compared to electric water heaters. Although, it is important to note that the gas models are far more expensive during the time of purchase.

Tankless Water Heaters

These units don’t store water. However, they deploy heating coils which heats the water according to your need. Also, they happen to be more efficient when it comes to using energy comparatively than a storage tank. But only offer restricted levels of hot water which flows around 3.5 gallons per minute. (which widely depends on inlet water temperatures). These units are ideal for those who are generally not drawing adequate water for more than a single use such as operating both a dishwasher and a shower at the same time.

Tankless heater models are perfect for households which employ natural gas in order to heat the water. Although, electric models might need a costly upgrade and are not compatible with the usual capacity of a home’s electrical system.


Tankless water heaters can be difficult to choose from due to its legion of options. However, with the right purpose of having one in the first place along with your budget levels and features desired. Then you can select a model which suits all your needs.

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