Top 7 Best Tankless Water Heaters Reviews 2019

One of the most selling water heater models in the market today is the tankless products. It comes in different forms and quality ideal for your home or place of work. The best model poses unique features ranging from its compact design, lightweight, less energy, etc.

The stress of getting these best forms of this model has been solved. All you need to do is to read through the seven best tankless water heater this article has brought with an adequate buying guide; then you are good to go.

Top 7 Tankless Water Heaters

Ecosmart Eco 27 Electric Tankless Water Heater

With its outstanding design, you would surely love to have Ecosmart Eco 27 water heater at your home. This model helps to save a lot of money on water heating costs. This product comes with patented self-modulating technology which gives the users the freedom to regulate the level of energy he or she wants to use to pressurize water thereby saving up some energy powers.

What’s more, this model is a compact design, which only takes less space and gives more room to install other necessary home materials. It has a huge water capacity has it can warm up 3 gallons of water per minute. Also, Ecosmart Eco 27 comes with digital control that does not only give a user the room to have easy access to the water heater, but it also gives the users the liberty to select the level of temperature to boiling up the water. Besides, it has a stainless designed component that restricts the activities of microorganism from the area of the water heater thereby preventing it from staining or fading.


  • Saves up cash
  • Comes with a digital control
  • Features stainless steel
  • Has a compact design
  • Features patented self-modulating technology


  • Dangerous for outdoor usage

Stiebel Eltron 224199 23OV, 1 Phase, 50/60 Hz, 24 KW Tempra 24 Whole House Tankless Electric Water Heater

There is no doubt that Stiebel Eltron is one of the best tankless water heaters. It is a model with the advanced technological system in the market. We are not just going to tell you these. With no controversy, it Is also a top choice for electric tankless water heater. This product was able to attain these ranks because of its outstanding features. Firstly, it is a water heater that does not consume a lot of energy only using 15%-20% KWH. On another hand, it also helps to save up bills on electric and gas.

Nevertheless, it comes with adjustable temperature system that gives any user the freedom to tune the water heater to the level of heat he or she wants. This model is also a compact design one that takes less space and gives room for the installation of other home electrical materials. Since you don’t need to vent a Tempra outside the home, you won’t encounter any difficulties in the installation of this model. It is a product with high water flow rate as you can bowl up to 8 gallons of water per minute. With its great sleek design, you would love to use it every minute.


  • Has a sleek design
  • Compact design
  • Has adjustable water temperature
  • Saves up energy and cash
  • Easy installation


  • A little bit expensive

Eccotemp L10 2.6 GPM Portable Tankless Water Heater

Eccotemp model is one of the best portable tankless water heaters. This is because it does not only fit into any space perfectly without much stress, but it also has a lightweight nature that makes it easy to be carried from one place to another. Apart from this, it comes at an affordable price, unlike most tankless water heater. With its 2 “D” cell batteries, you would get your adequate hot water even if there is no or low electricity supply. You don’t have to spend much time installing. All you need is to connect a garden hose and 20bl then you should continue to enjoy your constant hot water supply.

That is not all. This model also features an adjustable temperature soba user would be given the freedom to choose the level of hot water suitable for their choice. More importantly, Eccotemp is a model that is a way to clean and maintain. Nevertheless, it features a stainless steel cap that restricts the activities of microorganism from the product. Lastly, it comes with a 1-year limited warranty.


  • Features 2 “D” batteries
  • Has a stainless steel cap
  • Affordable
  • Easy installation
  • Portable


  • 12 months limited warranty

Rinnai RL75IN Tankless Water Heater

The reasons we have made this water heater one of our best are not from a vacuum; instead, they are as a result of several unique features it posses. Among these is long term durability. This model unlike other could last over ten years. It comes with a 12-year warranty on the exchanger heat and a 5-year warranty on the parts for home use and a 1-year warranty on the labor.

Also, it is a large size water heater that can produce up to 7.5 gallons of water per minute. This great capacity is most time backed up by less energy which at another hand helps to save expenses. With a digital remote control that comes along with these products, users enjoy easy access and operation of it. Similar to this, it is one of the safest water heaters. The two major downsides that could just be found with this model is that it is expensive and has a complicated installation procedure. Lastly, it has an adjustable temperature for efficiency and effectiveness of the product.


  • Long term durability
  • Large water capacity
  • Comes with a digital remote control
  • Has a sleek design


  • Expensive
  • Complicated installation procedures

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater

If you are looking for a tankless water heater that gives maximum satisfaction to a home or a family, then Rheem 240V is the best choice for you. This model features an adjustable temperature system that offers a user with the freedom to select the temperature level he or she wants to use. Moving away from this, with no doubt, this model is one of the energy efficient tankless water heaters. With its capacity of 1.5 gallons of water per minute, it provides adequate hot water to the whole house.

Another fantastic feature about this product is that it comes with an easy installation procedure without much stress or ordering for the service of a plumber. If you are also replacing the old one with a new one, you will not find it difficult to do. Rheem 240V also features a digital temperature display that serves an indicator of the level of the temperature to the users. Lastly, it features a self-modulating power control for effective operation of the water.


  • Easy installation
  • Features adjustable temperature system
  • Easy replacement
  • Comes with a digital temperature display
  • Adequate hot water supply


  • Limited lifetime warranty

Rheem RTG-8XLN 8.4 GPM Low Nox Outdoor Tankless Natural Gas Water Heater

Rheem RTG-8XLN gives you maximum outdoor satisfaction like you are at home. It is a suitable tankless water heater for camping, boating, hunting, RVs, etc. It does not only possess a compact design structure with perfect fitting into any space either large or small, but it also comes in a lightweight nature that makes it mobility from one place to another.

Apart from these unique features, this model also comes in a huge water capacity as it produces 8.4 gallons of water per minute. For this product, it is advisable not to be installed inside but outdoor. And since it is going to be an outdoor installation, you got no worry because it has easy and simple procedures. Also, it comes along with a remote control that does not only give a user easy access and operation of the water heater, but it also makes it safe for both the young and older adult. This model is an Energy Star certified as it uses a low rate of energy to produces adequate hot water for the maximum utilization of the whole family.


  • Energy Star certified
  • Low energy consumption rate
  • Not dangerous
  • Huge water flow capacity
  • East installation


  • Not eligible for international shipping

Takagi T-K4-OS-NG Tankless Water Heater Natural Gas, Outdoor

The selection of the best tankless water heater would be incomplete without this product. Takagi T-K4-OS-NG is one of the best natural gas tankless water heaters. It is portable can be easily moved from one place to another without any stress or lending for help.

Also, it comes in a compact design that makes it fit perfectly into either smaller spaces or a larger one. The installation procedure of this model does not only help to save money alone but also helps to keep time and stress. It is an efficient and effective one that can supply hot water to 2 or 3 bathrooms at ones. This product has a maximum water flow rate of 8.0 gallons of water per flush for an adequate dispensation of hot water to the area where it is needed.

Adding to these unique qualities, Takagi T-K4-OS-NG has long term durability. For home use, it comes with a 5-year warranty on the heat exchanger, a 3-year warranty on the other parts and a 1-year warranty on the labor. While for commercial use, it comes with a 3-year warranty for exchanger heat, and a 1-year warranty on the parts.


  • A maximum water flow rate
  • Easy installation
  • Long term durability
  • Compact design
  • Portability


  • Slightly expensive

Factors To Consider When Purchasing A Tankless Water Heater

As a result of the increase in the demand for the best tankless water tank, we have, reviewing several products, come up with the best seven tankless water heater you would love to get. But a downside of this is that, without a Buying Guide, this idea of the best seven tankless water heater would be useless. This is why we have written this buying Guide to give users factors to consider before going for a tankless water heater.


The best form of tankless water heater is the one that uses only little about of energy to pressurize water for the immediate consumption or usage by the buyer. Also, this model that uses less amount of energy helps to save a large amount of money.


A tankless water heater becomes a user’s friendly when you don’t need to spend a lot of time fixing it up, or you don’t have to order for the service of a plumber. So when going for this model, look for the product that comes with a step-to-step instruction details if you are just installing for the first time. But if you are just purchasing the existing one, then you should choose the one with easy installation processes.

Electric vs. Gas

It is essential to consider this factor. This is because of most tankless water heater either in a gas or electric form. For the electric water heater model, it is cheaper compared to the gas product. Also, the electric water heater is easy to install compared to the gas.

Meanwhile, the gas product has a high flow rare more than an electric water heater. It is vital to also, know that maintaining an electric water heater requires a lot of time and energy while the gas just needs cleaning once in a while. So before going for this product, you must choose either to go for gas or electric products.


Without considering this factor, you might not get the total satisfaction you want from a tankless water heater. In fact, this is the first thing you must know before you go for this product. If you don’t have a large space for a big water heater, then a small size model would be suitable for you to install at any place. Similarly, a buyer can decide to get a big water heater since the available spaces are enough to take two or more.