10 Best Tankless Water Heater Brands Review of 2023

10 Best Tankless Water Heater Brands Review of 2023
February 24, 2019 Mamun

Last Updated on January 28, 2023 by admin

Tankless water heaters are a guarantee for safety when you need hot water instantly to clean. There is no risk of explosion. One aspect that is cost-saving and that should make you think of buying it is minimal maintenance. This takes us down to the heater’s incomparable durability.

While the initial cost of purchase can be higher and seem expensive, the returns speak volumes. Forget about the gigantic water tanks that you store on rooftops or tank stands and take a lot of time to warm water. These save you space and the extra cost of buying big tanks that take up more space. If you have been using the older models, transitioning to these new versions can be hard. However, if you are looking for reliability and efficiency, the tankless water heaters will be the right ones to get. There is more on the electric vs. gas tankless water heater that you need to know if your primary concern is the energy source.

What The Guide Covers:

  • A few tankless water heater reviews from previous and current users
  • Gas tankless water heaters
  • Oil tankless water heaters
  • Electric tankless water heaters
  • Commonly asked questions about the tankless water heaters.

Product Name

Technical Features


1. EcoSmart

  • 98 pounds
  • 240 volts
  • 27000 watts
  • Lifetime warranty

2. Stiebel Eltron

  • 24 kW
  • 240 A volts
  • 100 A max draw
  • 50 GPM minimal flow

3. Rinnai

  • 50 pounds
  • Large size
  • 120 volts
  • 4 gallons of water consumption
  • Energy Star


  • 5kW power
  • 240V
  • 47GMP min flow
  • 23 A max amperage
  • 10AWG wire

5. Eccotemp

  • 5GPM
  • Liquid propane
  • Outdoor installation
  • 2 ‘’D’’ batteries
  • 120 V

6. Bosch Thermotechnology

  • 98% thermal efficiency
  • 120 volts
  • 4kW
  • 5 GPM
  • 5 lbs.

7. Rheem

  • 5 pounds
  • 240 volts
  • 7 gallons

8. Titan

  • 93 pounds
  • 220 volts
  • 54 Amp on the max

9. Atmor

  • 37 degrees of incoming water temp
  • 9 GPM
  • 240 V
  • 75 amperes load
  • Digital control

10. Marey

  • 11 pounds
  • 5 GPM
  • 115 degrees F
  • 2 D cell batteries

1. EcoSmart

Components – The fixture has stainless and copper components for more excellent reliability and for the system to work correctly. These materials are perfect as they don’t rust or corrode. You can easily replace them when they wear out.

Temperature Control – Temperature controls are digital and increase by 1 degree. Such allows you to control the hot water temperatures. The activation flow is about 0.3GPM.

Electrical Must-Haves – Some of the requirements that you need are 27 kilowatts, 240 volts, three 40 breakers, 112.5 amperes maximum power, three eight wires, and 113 A amperage draw. Without any of these, your system will not work.

Size – We love how compact the size of the heater is. A compact one like this will be great for saving you space. Also, it makes your space look more stylish.

1. EcoSmart ECO 27 Electric Tankless Water Heater

2. Stiebel Eltron

Advanced Exclusive Flow Control – The heater features the advanced exclusive Tempra flow control. If there is more demand for the hot water and exceeds the capacity, the flow control will automatically reduce the flow of water slightly. This will give a consistent water temperature and maintain it there.

Chambers – In the system are heating chambers from solid copper. This ensures that water takes the shortest time to heat and conserves energy. You can go through the electric water heater reviews before buying it.

Temperature Display – As a modern fixture, the temperature display is also digital. You need to know the water temperatures and when to reduce or increase if need be.

Energy – An auto-modulation system allows you to enjoy hot water use instantly while using very little power. If you have a bigger household, such a heater will be ideal for you.

2. Stiebel Eltron 224199 240V 1 Phase Whole House Tankless Water Heater

3. Rinnai

Energy Type – The Rinnai is among the few tankless water heaters that run on natural gas. Because of this and how it works, the manufacturer advises that you install it indoors only.

Flow Rate – Hot water flow rate will go to a maximum of 7.5GPM. However, this will vary with the temperature of the groundwater.

Circ-Logic Technology – The technology allows the user to set the recirculation patterns that match their habits. Now you can get an instant flow of hot water at any time. Consumer reports tankless water heatersto show that you can rely on it.

Warranty – There is a residential factory warranty on this unit that lasts 120 months on the heat exchanger. Twelve months will be on labor, and 60 months will be on the parts. Look at the Rinnai tankless water heater reviews on product sites.

3. Rinnai RL Series HE+ Tankless Hot Water Heater


The Heating System – ECOTOUCH instant water heater comes with a 5.5kW system that runs on electricity. You don’t have to wait for the system to preheat.  The temperatures will be at about 116 degrees F.

Adjustment – An aspect that we love about this system is the self-adjustment mechanism that will adjust depending on the flow rate. When the water flow is low, this is the best electric tankless water heater that will use less power. The results are a good saving on the energy you use.

Display and Panels – The unit comes with touch control panels and digital displays. It becomes an easier task to set and read the temperature settings. In short, we can call it a smart unit because of its performance.

Approvals – For certifications, the tankless water heater is ETL approved and passes all the UL certification needs. Such approvals prove that the unit is efficient, safe, and very reliable.

4. ECOTOUCH Electric Tankless Water Heater 5.5kW at 240V

5. Eccotemp

Certification – You must choose a heater that is safe for use for the household and environment. Also, it should save as much energy as possible while still doing its job. This one comes with a CSA certification among a few tankless water heater brands.

Function – The unit runs on a basic 20lbs. liquid propane tank. Also, it has an electronic ignition that is safer for use. Power is from 2 ‘’D’’ cell batteries and is very convenient for use by households and cooperate places.

Compatibility – You can make the heater more efficient by pairing it with an EccoFlo 12 volt water pump. If you are in a far and remote area, you will still enjoy instant hot water. It is the best propane tankless water heater.

Flow Rate – Water flow is about 1.5 gallons per minute. The water pressure can go as low as about 20PSI, and the water temperatures at this point will be within 50 and 140 degrees.

5. Eccotemp L5 Portable Outdoor Tankless Water Heater

6. Bosch Thermotechnology

Output – The tankless water heater has an output of 3.4kW and runs on electric energy. This means that you instantly get hot water when you need supplies.

Water Pressure – With full functionality, the heater is 98% efficient. You will not experience any loss when using it. The water pressure will range between 10 and 150 PSI with an Amperage of 30 A.

Installation – You can install it by mounting on the wall either horizontally or vertically. This saves you a lot of space. It is versatile, and you can use it in the bathroom or kitchen area. It is one of the best on-demand water heaters.

Flow Rate – The consumption of hot water will be 0.5 gallons per minute when the temperatures rise to about 45 degrees F. While at it, the unit uses 120 volts.

6. Bosch 3.4Kw Electric Tankless Water Heater

7. Rheem

Display – The unit an LED display and an exterior digital thermostatic control. We love how accurate it is as it will give an accuracy of plus or minus one degree.

Flow Rate – The flow rate of hot water goes to a maximum of 4.4 gallons per minute. It comes with two heating elements and durable copper immersion.

Installation – Its installation is effortless. This unit will need a bottom 3/4” NPT water connection. Otherwise, it will fail to function correctly. Most people agree with its efficiency in the Rheem tankless water heater reviews.

Specifications – The weight of the item is about 8.5 pounds and comes in a small size. The voltage it uses is 240, and water consumption about 7 gallons.

7. Rheem 240 V 2-Heating Chambers RTEX-18 Residential Water Tankless Heater

8. Titan

Usage – As you read the manufacturer’s recommendations, you will see that it is advisable for use in warmer areas. Use it in areas where the water is more than 65 degrees F.

Warranty – Titan agrees to replace the whole tank system at their cost. This will save you more money and time without inconveniencing you for a long time.

Portable – The size of the tankless water heater will amaze you. It is compact to allow for proper storage and easy transportation. Also, it weighs 7.93 pounds, which is lightweight.

Connection – The unit runs under electricity and doesn’t need batteries to support it. It uses 220 volts and 54 amperes on the maximum side.

8. Titan Electric Tankless Water Heater

9. Atmor

Controls – The unit is more comfortable to control using the digital temperature controls. It is very efficient and has an increase or decrease by 1 degree. It is a good point of use water heater for shower.

Requirements – Some of the things that you need are 75 amperes total connection load, 240 volts, three 8 AW wires, and three 30 amperes single-phased DP breakers. Without all these, the unit will be incomplete and will not function.

Function – This unit is to heat incoming water with temperatures that could be low up to 37 degrees and amounting to 1.9 gallons per minute. It is ideal for your household or business premise. The stainless steel components are durable and don’t rust or corrode.

Warranty – There is a two years warranty on the parts of this unit. For any water leakage, the manufacturer will service the heater for seven years at their cost.

9. Atmor AT-910-18TP ThermoPro

10. Marey

Flow Rate – The Marey Power Gas tankless heater has a hot water flow rate of 1.5 gallons per minute. This is enough to wash or shower as there will be no wastage. This is among the best tankless gas water heaters.

Output – Water temperatures after a session of heating will be at about 115 degrees F like a standard water heater size. It doesn’t take time to heat water as it has an instant heating system.

Usage – You will love how well it works and its efficiency. The water heater can supply hot water to 1 or 2 points simultaneously without any faults.

Ignition – To ignite the system, you need to have 2 D cell batteries and a proper venting system. However, these are separate purchases and don’t come with the unit.



Definition of a Tankless Water Heater?

A tankless water heater is a unit that spontaneously heats cold or warm water to higher temperatures. The water passes through a heat exchanger coil before you can use it.

History Of Tankless Water Heaters

Before the technologies advanced, people, heat water using firewood, then later gas, and electricity. With the rapid use of electric energy, there were electric tankless water heaters. You would install them well in a tank to heat water. The first invention of the tankless water heater was from Stiebel Elton in 1929. Companies like Bosch, ECOTOUCH, and Rinnai, which are top water heater brands, began producing various models of these units. They are still in business to date and doing very well.

  • Different Types Of Tankless Water Heaters

Condensing Tankless Water Heaters

Under the condensing tankless water heaters, you find the gas heaters, electric heaters, commercial heaters, small electric tankless water heater, RV portable heaters, whole house heaters, and hybrid water heaters.

  • Non-Condensing Tankless Water Heaters

These types of tankless water heaters were the first ones to come into existence. They use heat exchangers to heat water and pass the exhaust to the outdoor space.

Advantage Of Tankless Water Heater

  • The unit is cost-saving in the long run, even if the initial cost is very high.
  • Their lifespan is longer than most water heaters.
  • You don’t need much storage space for these units.
  • Hot water supply is instant and throughout.
  • The supply of hot water is evident in multiple faucets or showers.

Factors To Consider While Shopping for Tankless Water Heaters

Flow Rate

The flow rate is the amount of water that your tap releases in every minute. If you look at the reviews above, most of them are above 0.75 gallons per minute. You need a flow rate that is reasonable to avoid water wastage and also save time. Most are among the top-rated tankless water heaters.


Each unit comes with the specifications that you need to consider. The wires, amperes, voltage, and type of batteries if yours needs them. Also, those that use batteries might require you to make separate purchases for these batteries.


Despite being compact and easy to move around with, the weight of your tankless water heater is very important. It will determine if you will mount it on the wall or have to look for a different way to install it.


Of course, tankless water heater vs. tank differs in price. Their cost is higher than most heaters in the market. Window shop around to see the best tankless water heater brands and how much they cost so that you can compare if you are willing to spend the amount. If you can’t, save more.

How Does a Tankless Water Heater Operate?

Tankless water heaters operate by immediate action. They don’t need water tanks to heat water as the water passes through the heating coils when you open the tap. Heat could be from electricity or a gas burner.

What Is The Cost Of A Hot Water Heater?

On an estimate, if you consider the gas or electric heaters, the cost ranges between $400 and $1600. You can be lucky to find units less than the estimate but still function very well. If you compare with other heaters, they are costly but worth it. Check the tankless water heater reviews before making payment.

Which Size Of A Tankless Water Heater Should I Buy?

The size to buy will depend on how big your household or premise it. For smaller sizes, a small to medium size unit will be enough. A bigger premise will need a larger size.

What Is The Lifespan Of A Tankless Water Heater?

Tankless water heaters are the most durable water heaters in the current market. They can last more than 50 years, making it the best option for you.

What is the GPM Of A Shower?

The GPM is also the flow rate. A showerhead has a GPM of 2.5, and this flow rate is the standard approved for use worldwide.

Are Tankless Water Heaters Worth The Money?

These units are worth every dime you spent on them. Besides saving you time, money, and being reliable, they are durable and a real investment.

Are Tankless Water Heaters Better?

Tankless water heaters are better because of how compact they are. Also, they work instantly, allowing you to access hot water at any time you want.

Do These Tankless Water Heaters Save You Money?

They do. Their initial purchase might be high, but you will witness a more significant reduction in your energy bills. These units take up very minimal energy than a usual heater would.

What Is The Best Tankless Water Heater?

The best tankless water heater will depend on your needs to start with. Also, when it comes to budget, some are higher end than others.

Do Tankless Water Heaters Use Gas Or Electricity?

There are a few units that run on natural gas for ignition. However, the majority of these tankless water heaters are electric.

What Amount Of Electricity Do Tankless Water Heaters Use?

The electric tankless water heaters come with different elements. For instance, one with two elements uses 4500 watts or thereabout for each component. Nine thousand watts will be for the two components making the unit more energy effective to use.

Can You Use A Tankless Water Heater Instead Of A Hot Water Heater?

You can. With the new advancements in technology, the former is the best alternative to use or replace the latter. Water heaters are costly to maintain and don’t have longer lifespans. All of them, however, do the same thing but work under very different mechanisms.

Are Electric Water Heaters Cheaper Than Gas Options?

No. Gas water heaters are costlier to operate. Also, their initial cost is usually higher than that of electric tankless water heaters. You can read more on the gas vs. electric water heaters to find out more differences.


Gone are the days when we’d use bulky water tanks over the roofs with panels to heat water. It is not reliable, expensive, and time-consuming, besides doing the same thing as the tankless options. Thanks to technology, the tankless water heaters are good sights, aesthetics, reliable, and durable. Find what is right for your needs and get it. There are tankless water heaters Amazon options that you can look at in our guide to make placing an order easier.


  1. Sheri Koones: https://www.forbes.com/sites/sherikoones/2023/07/01/saving-energy-while-heating-water-with-a-tankless-water-heater/#3ed07cba1762: July 1, 2023.
  2. Kurtis McKenney, James Brodrick, and John Dieckmann: https://www.researchgate.net/publication/242707157_Gas_Tankless_Water_Heaters: December 2009.
  3. Martha J. Hewett, David L. Bohac, and Ben Schoenbauer: https://www.mncee.org/MNCEE/media/Applications/Research%20PDF/tankless.pdf



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