Best Tankless Water Heater – (Reviews & Ultimate Guide 2020)

A good supply of hot water is truly appreciated in a winter morning when it stops.  Usually, the system that provides the water works well for years without a hitch. But if you have chosen the wrong type of equipment, then the hitch can come at any time.  The water heater impacts your life in the cold winters more than you realize.  You are in the middle of the shower and all of the sudden water turns freezing cold. No one wants to be in a situation like that.

This heater can be a costly investment for homeowners. No matter you are renting or buying a house you need to equip it with a water heater. There are two main types of a water heater, i.e., traditional heater and Tankless Water Heater. Like most purchases, there is trade-off while deciding which one is better for you. A conventional heater preheats and stores 30-50 gallons of water in the tank. It utilizes a heat source (propane, gas, electricity) to warm up the water on demand.

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List of Top 12 Tankless Water Heater in 2020:

S/no Product Name Type Product Dimensions Weight in Pounds Rating Price
01 Rinnai RUC98iP Ultra Series Propane 10 x 18.5 x 26 inches 82 lbs [usr 4.0 text=”true” tooltip=”false” size=15] Check Price
02 TAKAGI TH3OSLP Propane 21.8 x 15.6 x 33.2 inches 69 lbs [usr 0.0 text=”true” tooltip=”false” size=15] Check Price
03 Rinnai RUC98iN Ultra Series Gas 10 x 18.5 x 26 inches 82 lbs [usr 4.5 text=”true” tooltip=”false” size=15] Check Price
04 Rheem RTGH-95DVLN Indoor  Gas 18.5 x 9.8 x 27.5 inches 82 lbs [usr 4.2 text=”true” tooltip=”false” size=15] Check Price
05 Takagi T-H3-DV-N High Efficiency  Gas 11.2 x 17.8 x 24.9 inches 85 lbs [usr 4.0 text=”true” tooltip=”false” size=15] Check Price
06 Noritz NRC661-DV-NG Indoor  Gas 6.7 x 13.8 x 23.6 inches 39 lbs [usr 4.0 text=”true” tooltip=”false” size=15] Check Price
07 Rinnai V75IN 7.5 GPM Indoor Gas 14 x 9 x 23 inches 49.6 plbs [usr 4.3 text=”true” tooltip=”false” size=15] Check Price
08 Stiebel Eltron 36 Plus White Electric 4.6 x 16.6 x 14.5 inches 1 lbs [usr 4.4 text=”true” tooltip=”false” size=15] Check Price
09 Stiebel Eltron Tempra Plus 36 kW Electric 16.5 x 4.6 x 14.5 inches 19 lbs [usr 4.4 text=”true” tooltip=”false” size=15] Check Price
10 Stiebel Eltron Tempra 24 kW Plus Electric 21 x 19 x 8.5 inches 20 lbs [usr 0.0 text=”true” tooltip=”false” size=15] Check Price
11 EcoSmart ECO 27, 240 Volts Electric 3.6 x 17 x 17 inches 16.8 lbs [usr 4.1 text=”true” tooltip=”false” size=15] Check Price
12 Rheem RTEX-18 Electric 4 x 15 x 19 inches 8.5 lbs [usr 3.9 text=”true” tooltip=”false” size=15] Check Price

Best Tankless Water Heater Reviews:

After scouring the market in search of the top tankless water heaters for home or commercial use we have made a list. There are many options to choose from.  Well, choosing a tankless heater should not be so confusing, so here we have given an honest synopsis of some of the best , so that you make an informed decision. Without further ado let’s have a look at each of them separately.

1. Rinnai RUC98iP Ultra Series Propane Tankless Water Heater:

If you are seeing for a tankless water heater that provides the homeowners with an endless supply of hot water and is environment-friendly, then Rinnai Ultra Series line is the right choice.  it is with a space saving design. It is easy to install with more venting options out of the box. It works only when hot water is needed. It means it reduces utility cost .


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Let’s check it out:

  • It delivers a continuous supply of hot water to multiple fixtures simultaneously.
  • Space saving design allows the users to install it anywhere.
  • For a healthier environment and cleaner air, This Propane Tankless Water Heater has Earth-friendly technology .
  • It is available with multiple venting options including PVC/CPVC.
  • It has the lock function that prevents accidental changes to the temperature.


This Ultra Series delivers innovation and provides homeowners with an endless supply of hot water in freezing winter mornings. Here are the technical specifications of the product:

  • Brand: Rinnai
  • Model: RUC98iP
  • Installation type: Indoor
  • power factor: 0.95
  • Minimum activation rate: 0.4 GPM
  • Hot water flow rate: 0.26 – 9.8 GPM
  • Voltage: 120 volts
  • certification: Energy Star

No matter what kind of machine you are buying make sure that your money is not wasted. It is always helpful to know the pros and cons of a tankless heater before making a final decision to buy.

  • Never run out of water in a cold morning
  • Condensing with ultra-efficiency
  • Easy to install
  • Indoor heater
  • Space saving design
  • It takes a long time for the hot water to reach the faucets


2. TAKAGI TH3OSLP  Best Tankless Water Heater:

Tankless water heaters are also known as the on-demand water heater as they supply water only when Required. There is no water tank . Before selecting a heater, you should identify your needs and then decide which Heater will be suited for your home or commercial building.


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TH3OSLP is a high-efficiency propane tankless heater . It has no tank that means you can install it anywhere. There is no pilot light to keep a check on, and the computerized safety option make it the right choice for your home. It is easy to install, and once it is installed, you will never run out of  water in during a shower.  TAKAGI TH3OSLP 2020 can heat 10 gallons per minute.


You can’t decide until you know everything about a product. Here are the Details of TAKAGI TH3OSLP:

  • It is a perfect water heater for light residential heating applications.
  • For constant temperature monitoring, it has inlet and outlet thermistors.
  • It is capable of heating 3-4 consecutive showers with no downtime.
  • It comes with a remote control for easy adjustment of heater settings.
  • The product has multiple safety options to protect against overheat and freeze.


  • Brand: TAKAGI
  • Type: Tankless heater
  • Product: TH3OSLP
  • Power source: liquid propane
  • Energy Star: complaint
  • Material: copper

You have decided to install a It  because it reduces the utility bills. Tankless water heaters take less space, so it is a great option when you live in a small house. Takagi TH3OSLP  has the following pros and cons:

  • Since it is small in size so you can install it anywhere
  • It provides enough supply of heated water to run three showers at a time.
  • It is highly efficient.

It uses less energy to provide hot water so those who love to take showers will adore it.


3. Rinnai RUC98iN Ultra Series A Definite Leader Natural Gas Water Heater:

Water serves as the essential source in daily life. You need water to drink, wash dishes, and doing laundry, etc. If you live in a country where there is freezing cold weather outside, then you need a continuous supply of hot water. Traditional water heaters store water in the tanks, but they increases the bills and are not environment-friendly. Also, they occupy a large space, so it becomes impossible for people living in small homes to install it.

Rinnai Ultra Series RUC98iN Indoor Tankless Water Heater 2020

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On-demand water heaters can provide a continuous supply of water. So, tankless water heaters are perfect for those who do not have enough space in the home and want to save energy as well.

RUC98iN : It has the buttons to lock the temperature and control gas flow. It is not light in weight and is bigger than most  water heaters. RUC98iN offers multiple venting options.


It offers the following features:

  • It enables you to control the temperature of hot water.
  • You can lock the temperature to prevent unauthorized access.
  • It supplies sufficient hot water to multiple faucets and showers.
  • It has a space saving and sleek design that allows you to fix it anywhere in the home.
  • RUC98iN roughly has the size of a largish carry on suitcase.
  • Consumes less energy
  • Compact and space saving size
  • Reduced risk of contamination
  • Intuitive temperature control
  • Extremely quiet during operation
  • Provides hot water when you need it
  • The unit can serve up to five showers
  • The temperature may drop when it serves more than one water outlet
  • The unit may take a while to heat the water
  • Expensive
  • Difficult to install
  • Requires regular maintenance


4. Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Water Heater With Massive Output Capacity:

You live in a cold climate; then you can’t even imagine running out of hot water during a shower. You need hot water to do the dishes and laundry etc. So, a tankless water heater is the appropriate appliance for your home. It hold several advantages. They do not take up adequate space and are environment-friendly. Guess what the most interesting part is? Tankless water heaters reduce your energ bills as well.

Rheem RTGH-95DVLN Indoor Direct Vent Tankless Water Heater

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Rheem RTGH-95DVLN runs on natural gas and has electric ignition. It covers the temperature range of 85° C – 140°C.


Rheem is one of the most recognized water heater brands in the industry. According to the people who have installed it in their homes say that it actually provides an endless supply of  water. Now let’s check the Details:

  • The unit is energy efficient and provides 94% efficiency.
  • It produces 9.5 gallons per minute, hot water. It is a perfect option when you have a large family.
  • The unit comes with a digital remote control unit.
  • It has built-in freeze protection.
  • It gives a powerful performance.
  • The unit comes with a five years limited warranty on the parts and twelve years limited warranty on the heat exchanger.
  • It also has the overheat film wrap feature to provide protection if an exchanger breach happens.
  • The self-diagnosing system with the digital display warns the users about any malfunction.
  • The unit Creates low level of Nox emissions, so it is an environment-friendly .

You have chosen to switch from a traditional water heater to tankless water heater. Well, it is a right decision, but before buying Rheem RTGH-95DVLN Tankless Natural Gas Water Heater 2020 have a look at its pros and cons:

  • An ideal solution for homes that require a constant supply of hot water.
  • The freeze protection technology makes it best to be used in the coldest of climates.
  • Its small size makes it perfect for homes with less space.
  • It is not suitable for smaller households.
  • It is on the expensive side.


5. Takagi T-H3-DV-N High-Efficiency Indoor Natural Gas Condensing Heater:

There are various types of water heaters available in the market. One of them is Takagi T-H3-DV-N. It is an indoor condensing tankless water heater that can produce ten gallons per minute which makes it a solution for “big hot water needs.” It provides a continuous supply of hot water without any issue. It is one of the best selling Product.

Takagi T-H3-DV-N High-Efficiency Condensing Indoor Natural Gas Tankless Water Heater 2020

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When there is cold water in pipes the heater and internal burner fire up, it runs on natural gas and is more energy efficient than other units that run on natural gas. The unit is a bit tricky to install so you should get the professional help.


  • The device provides surge protection, troubleshooting diagnostic codes, overheating management and freeze control features.
  • Whenever there is cold water in the pipes, the heat exchanger and internal burner detects it.
  • The unit is energy star qualified and is durable.
  • It comes with a long time warranty.
  • The manufacturer has made it hard enough, so it is good for heavier purposes.
  • It has a space saving design.
  • It is a cost-saving unit due to its self-modulating heating mechanism.

Thanks to the internet. It has made it easy for consumers to read the reviews of a product before buying it. Now we will see the positive and negative points of Best Takagi Natural Gas Tankless Water Heater:

  • Suitable for big family
  • 95 energy factor for Natural Gas
  • The maximum flow rate of 10.0 GPM
  • No heated air that will come out of it.
  • No Running Out of Water
  • Straightforward Installation
  • Low Carbon Footprint
  • Powerful unit that can serve commercial as well as residential properties
  • No need for fancy vents due to the condensing system
  • GPM might pause in colder climates
  • The hefty initial price tag
  • Installation can be complicated
  • Poor Repair Conditions
  • Reports of Premature Breakage
  • Does not work well on low sized pipe setting


6. Noritz NRC661-DV-NG Condensing Direct Indoor Tankless Water Heater:

Noritz NRC661-DV-NG is a gas-fired tankless water heater. Noritz Company has a reputation in the industry for producing low priced water heaters. Noritz NRC661 is designed for small homes. The weight of the unit is thirty-eight pound. It is light in weight and moderately powerful still it is a great choice than a traditional water heater. It heats the water on demand using natural gas, but it has an electric ignition as well.

Noritz NRC661-DV-NG Tankless Hot Water Heaters

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The unit comes with basic temperature control. However, the user can get an optional remote control with a digital display too. The unit consumes 54 watts of electricity when active. Noritz water heaters are eco-friendly, space saving and economical.


  • The unit is smaller than carry-on luggage which means you can install it any where.
  • Since there is no storage so your hot water will not be stored in a rusty tank.
  • It has a high elevation adjustment feature.
  • It provides freeze protection.
  • Also, it features a flame sensor, fan rotation detector, lightning protection device and overheats prevention device.
  • The temperature lockout feature is also included.
  • The unit can last up to fifteen years (more than the traditional water heater).


  • Brand: Noritz
  • Model: NRC661-DV-NG
  • Type: Condensing Direct Indoor Tankless water heater
  • Fuel source: Natural gas
  • Energy factor: 0.91
  • Vent type: Direct Vent
  • Mounting location: Indoor wall mounted
  • Thermal efficiency: 93%  efficient
  • Electrical consumption: 54 Watt
  • Water pressure required: 15-150 PSI
  • It is Safe to use
  • High efficiency of the unit makes it a perfect water heater for homes
  • It is best for small families
  • It has Low Nox design
  • Built in design allows temperatures to rise to 140F
  • The unit needs electricity
  • The unit does not come with the remote
  • It does not meet the hot water needs of the big families


7. Rinnai V75IN 7.5 GPM Low NOx Tankless Indoor Water Heater For Value And Comfort:

It is so annoying when you open a tap in the winter morning to wash the dishes, and the cold water comes out. You need to install a water heater that not only takes occupies less space but also reduces the energy bills. What can be better than the tankless water heaters that are compact in size, easy to install, and provide a continuous supply of hot water?

Rinnai V75IN 7.5 GPM Low NOx

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The technological advancement has led people to the tankless water heaters that are portable. Today, people have small homes, or they live in small apartments so, there is no space for conventional water heaters. Rinnai V75IN water heater is specifically designed for small to medium homes. When you install it, you never run out of hot water again. It does not break your budget as well.


It is highly essential for the consumer to know what features the product he is going to purchase, offers. So, here we have discussed a few Here:

  • Designed for indoor use only
  • Electric ignition eliminates the requirement for a pilot light
  • it has concentric direct vent system
  • Isolation valves are sold separately
  • Allowed to install in mobile home
  • Integrated temperature controller
  • Ten-year residential warranty on heat exchanger, one year warranty on labor and five years warranty of parts


  • Brand: Rinnai
  • Model: V75IN 7.5 GPM
  • Amperage: 4 Amps
  • Voltage: 120v
  • Ignition Type: Electronic
  • Fuel Type: Natural Gas
  • Minimum flow rate: 0.26 GPM
  • Approved for commercial use: No
  • Ergonomic design
  • Easy to install
  • Easy to maintain
  • Flexibility to use in mobile homes
  • Powerful performance
  • Expensive

8. Stiebel Eltron 36 Plus White Tempra:

No matter what temperature is outside the house, tankless water heaters provide a continuous supply of hot water without fail. Wash dishes, clothes or take a shower, you will never run out of hot water in the cold weathers. Stiebel Eltron 36 is one of the most powerful water heaters available today. It is a popular choice of homes and commercial applications.

Stiebel Eltron Tempra 36 Plus

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  • It has the advanced microprocessor technology that constantly monitors the temperature.
  • Digital temperature control and display allow the user to control and manage the temperature.
  • The unit features an advanced flow control that automatically controls the flow through the water heater.
  • It provides hot water at a constant temperature from 68 to 140 F.
  • The unit has a sleek design thus making it possible for you to install anywhere.
  • There is no venting required when you install Stiebel Eltron 36 Plus Tempra.


  • Brand: Stiebel
  • Model: Eltron 36 Plus Tempra
  • Type: Tankless water heater
  • Certification: Not available
  • Product dimensions: 4.6 x 16.6 x 14.5 inches
  • Installation method: mounting
  • Batteries included: No
  • The unit has a smart design
  • It automatically control its internal settings to the amount of power required
  • It does not waste energy and the water flow in times of high use
  • Some buyers are not impressed by the automatic management system
  • The price of the unit is on the high side


9. Stiebel Eltron Tempra Plus 36 kW:

Due to the existence of several brands in the market getting the best tankless water heater has become a quite hassle. We have given an honest review of some of the best tankless water heater here to make the process a little hassle-free for you. If you are looking for a water heater that is eco-friendly and performs well then Stiebel Eltron Tempra Plus is the right choice for you.

Stiebel Eltron Tempra Plus 36 kW


Following are some remarkable features :

  • It has proven to be a reliable tankless water heater for home use.
  • The unit has digital temperature control.
  • It has a sleek design that fits everywhere and does not occupy much space.
  • No venting required when you install Eltron Tempra 36 KW.
  • It reduces energy bills up to 20% .


  • Brand: Stiebel Eltron
  • Model: Tempra Plus 36 kW
  • Type: Ground temp above or below 60°F
  • Amps Required: 150
  • Weight: 19 lbs
  • Household Amperage Required: 300 amps
  • Installation Location: Indoor
  • warranty: three years limited


10. Stiebel Eltron Tempra 24 kW Plus Tankless Electric Water Heater:

A tankless heater that is designed to be energy efficient that decreases the bills up to 15%  is Stiebel Eltron Tempra 24KW Plus. There are soft-touch control buttons and a knob to adjust the temperature of water. The LED screen displays the current water temperature. The cost of installing Stiebel Eltron Tempra Plus 24 kW is slightly above average. Advanced flow control technology reduces the water flow automatically when multiple faucets are drawing hot water. It helps you get hot water continuously.

Best Stiebel Eltron 24 kW Tempra Plus Tankless Electric Water Heater Reviews 2020

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What are the features of Stiebel Eltron Tempra Plus 24 kW? Let’s see:

  • It has a sleek design so you can fit it anywhere.
  • It has proven to be a reliable water heater.
  • The best part of the unit is that no venting is required.
  • It has digital temperature control.
  • The unit is 99 %  efficient, and it saves 15-20 % of the cost of your bills.
  • It has easy to read digital display.
  • It has self-modulating technology .


  • Brand: Stiebel Eltron
  • Model: Tempra 24 Plus
  • Materials: All Copper Internals
  • Amperage: 100A
  • Energy Efficiency: Up to 99.5 %
  • Wattage: 24kW
  • Fair price
  • Compact size
  • 0.5 GPM activation flow rate
  • supports existing heaters


11. EcoSmart ECO 27, 240 Volts Electric Tankless Water Heater Saves up to 50 % of Energy Cost:

Installing a water heater in the house is a necessity, not a luxury. You need hot water in the winter. So, buying a tankless water heater is always a great idea as it takes less space and is fuel efficient. EcoSmart ECO 27 provides the perfect water temperature in the winter mornings to do the laundry, dishes and taking a shower. When you install it your power bill significantly goes down.

EcoSmart ECO 27

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Here are some exciting features of EcoSmart Eco 270 tankless water heater:

  • The components of Eco 27 are designed for durability, efficiency and easy replacement.
  • The unit has advanced design that looks appealing.
  • It is compact in size, so it does not take much space.
  • It saves up to 50 % of your fuel cost.


  • Brand: EcoSmart
  • Model: ECO 27
  • Voltage: 240 volts
  • Pipes fittings: 3/4 inch NPT
  • Dimensions: 17H x 17W x 3.625D inches
  • Electrical requirements: 27 kW, 240 volts
  • Required Breaker Quantity: Three 40 Amp Double Pole
  • Patented Self-Modulating Technology
  • Unit is 99.8 % energy efficient
  • Ease of installation
  • One of the best and most responsive customer service
  • Lifetime warranty
  • Unit requires a lot of power It may take a week to get used to settings


12. Rheem RTEX-18 Energy Efficient Electric Tankless Water Heater:

It is a water heater that is designed to meet the hot water needs. It has the self-modulating unit that adjusts the water temperature to reach the desired one. It is not that difficult to install and offers an easy replacement. It is a durable water heater that has a sleek design. It does not look weird when installed inside You Home.

Rheem RTEX -18 Tankless water heater for tiny house

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  • The unit is simple and easy to install.
  • It has a digital temperature display.
  • It has a compact and modren design that goes well with the aesthetical beauty of the house.
  • The unit has the external controls to adjust the water temperature.
  • Digital temperature display shows the current temperature of the water.
  • To increase durability, it has robust copper immersion heating elements.
  • It provides a consistent supply of hot water.
  • The unit is 99.8 % energy efficient.


  • Brand: Rheem
  • Model: RTEX-18
  • Voltage:240V
  • Power: 18 kW
  • Water Connection:3/4 Inch
  • Power Source: Electric
  • Max Flow Rate: 7 Gallon Per Minute
  • Required Breaker: 2 40Amp
  • Highly Fuel efficient
  • Reduces your regular electricity bills
  • Easy to install
  • Stylish design
  • On-Unit controlling feature
  • Self-modulation unit
  • Offers maximum temperature control
  • Warranty is insufficient
  • Consumes a lot of Power
  • When shower and sink are in use the water becomes cold sooner



Though many manufacturers claim that their water heaters adequately provide hot water to the entire house, it is not true. But it is also a fact that tankless water heaters are far better than the traditional water heaters that occupy much space in the house and are not stylish at all. Tankless water heaters save space and energy. Buy an adequate size of water heater after determining your requirements.

Our Top 3 Picks:

Low BudgetBest BudgetMax Budget

EcoSmart ECO 27 Electric:

EcoSmart ECO 27 Electric Tankless Water Heater

Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White

Stiebel Eltron Tempra 36 Plus

Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater, Twin Pipe

Rinnai RUC98iN Ultra Series 2020

Electric water heaters are indeed a fantastic investment, but you can also choose a water heater that runs on natural gas. It was not easy to search for tankless water heaters, but we did it to make it simple for you to pick the right sized appliance for your home. All you need to do now is to weigh the pros and cons and take a look at the Product details of each one to decide which one best suits your needs. You can also check our blog section to get information about the problem and their solutions for tankless water heaters. Stay tuned to our website for detailed reviews of each product so that you can buy one that best suits your needs. You can check them on Amazon to see the prices.