Best Tankless Gas Water Heaters – Reviews & Buyer Guide

People experienced that; a tankless water heater has proficiency in saving money in the long run compared to traditional heaters. In this regard, Tankless gas water heaters are the best choice than tanked heaters. Best tankless gas water heaters provide on-demand hot water whenever you require it. It can help you to save an average of $108 per year in the context of energy costs.

If you were to choose from the best gas tankless water heaters out there, you would end up saving much more, especially when you use them economically. Here in this article post, I’ll present you the top 09 best gas tankless gas water heater reviews, benefits, and comprehensive guide. In short, get ready for all the information about the best tankless gas tankless water heaters that you would require; let’s take a look!

Self Modulating Technology + Top-Pick Self Modulating Technology + Top-Pick

Eccotemp i12-NG Tankless Water Heater

Eccotemp i12-NG Tankless Water Heater
  • Power: 27000W
  • Temperature: 80-140° F
  • GPM : 2.7-6.5
  • Installation : Takes time
  • Energy Efficient : Yes
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Top-Rated+Lifetime warranty Top-Rated+Lifetime warranty

Rinnai RUR199iN Condensing Tankless Hot Water Heater, 11 GPM

Rinnai RU199iN -Natural Gas Water Heater for Small Home
  • Power: 18000W
  • Temperature: 80-140° F
  • GPM : 3
  • Installation : By licensed electricians
  • Energy Efficient : 99.8%
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Circa-Logic technology+High-End Circa-Logic technology+High-End

Rinnai RU130eN 

Rinnai RU130eN – Natural Gas Tankless Water heater
  • Gas Type : Natural Gas
  • Temperature: Adjustable
  • GPM : 9.4
  • Installation : Indoor Installation
  • Energy Efficient : 82%
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Buyer’s Choice+For small families Buyer’s Choice+For small families

Camplux CA 318

Camplux CA 318 -Natural Gas Tankless Water Heater
  • Power : 13000W
  • Temperature: 80-140° F
  • GPM : 2
  • Installation : Easy
  • Energy Efficient : 99.8%
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Wall-mounted+LED display Wall-mounted+LED display

Takagi T-H3-DV-N

Takagi T-H3-DV-N -Natural Gas Indoor Tankless Water Heater
  • Power : 13000W
  • Temperature: Adjustable
  • GPM : 3.17
  • Installation : Easy
  • Energy Efficient : 99.8%
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Portable +Safe+ Best Budget Portable +Safe+ Best Budget

Noritz NRC66DVNG

Noritz NRC66DVNG -Tankless Hot Water Heater
  • Power : 12000W
  • Temperature: 46-114.8℉
  • GPM : 1.58
  • Installation : Outdoor installation
  • Energy Efficient : Yes
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Safe + Affordable Safe + Affordable

Rinnai RUR199iN

Rinnai RU199iN  -Natural Gas Tankless Water Heater
  • Power : 10000W
  • Temperature: 46.4-114.8℉
  • GPM : 1.32
  • Installation : Outdoor
  • Energy Efficient : 80%
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Self-Modulating Power Technology & Advanced Flow Control Self-Modulating Power Technology & Advanced Flow Control


CAMPLUX CM264-NG -Natural Gas Residential Water, Heater
  • Power : 29000W
  • Temperature: 86-140°F
  • GPM : 2-4
  • Installation : Easy
  • Energy Efficient : 99%
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Multi-Point-of-Use + Microprocessor technology Multi-Point-of-Use + Microprocessor technology

Rheem RTGH-95DVLN-2

Rheem RTGH-95DVLN-2 –Tankless Hot Water Heater
  • Power : 12000W
  • Temperature: 86-125°F
  • GPM : 1.5
  • Installation : Easy
  • Energy Efficient : Yes
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Best Tankless Gas Water Heater Reviews – (Top-Picks)

1-Eccotemp i12-NG – Tankless Water Heater

Eccotemp i12-NG Tankless Water HeaterThe Eccotemp i12-NG is the best natural gas tankless water heater. It is well capable of delivering up to 3 GPM of hot water in ideal situations. Furthermore, its compact design allows you to store it in multiple places at your home, and its automatic temperature control allows you to set it as per your requirement and climate. You don’t face any issue in Eccotemp i12-NG stings because all its sittings are easily viewable via LED display with child safety lock features.

Eccotemp i12-NG is the best-rated gas tankless water heater; you can plug it into a standard electrical outlet. It is specially designed according to extra energy-saving mode and child safety lock to prevent accidental tampering. In addition, it has electronic ignition, which means there is no pilot light to worry about lighting.

Key Features

  • Whole-home indoor gas-powered tankless water heater
  • You can activate only on demand
  • It has no pilot light needed
  • It will be reducing energy consumption
  • Sleek, modern design with black tempered glass front panel features
  • Made with an easy-to-use LED display control
  • Introduce a safe electronic ignition system

Manufacturer Warranty Description

  • 2 Year Limited Manufacturer Warranty
Things we like?
  • 3 GPM
  • Compact design
  • LED display
  • Automatic temperature control
  • Energy efficient
  • Space saver
  • Child safety lock
  • Plugs into a standard outlet
  • Electronic ignition
Things we don’t like?
  • Not durable

                        Product Information

Product Dimensions                   17 x 29 x 11 inches

Item Weight                                 28.8 pounds

Manufacturer                              Standard Plumbing Supply

Voltage                                         120 Volts

Flow Rate                                     4 Gallons Per Minute

Voltage                                         120 Volts ‎

Usage                                            ‎Indoor

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2-Rinnai RU199iN -Natural Gas -Water Heater For Small Home

Rinnai RUR199iN Condensing Tankless Hot Water Heater, 11 GPMRinnai RU199iN RRU199iN tankless water heater is a best-rated gas tankless water heater for those who’ve grown tired of running out of hot water. It delivers up to 11 GPM of hot water to your home. Its extra fast 199,000 BTU of heating power makes sure your water never runs cold even when running multiple showers. In addition, its whisper-quiet and push-button controls make it easy to adjust the water temperature as per your need.

When you buy Rinnai RU199iN Tankless Water Heater, you will be impressed with its healing power. The Rinnai RU199iN includes a decent flow rate of 11 GPM, which is great for any tankless water heater. It means that the Rinnai RU199iN takes minimum time to produce hot water. So due to its progressive Efficiency, you can get endless hot water for your home at any time. It is the best tankless gas water heater for a small home if you have a limited number of faucets running in your home.

Key Features

  • Easy to install
  • flexible venting
  • Easy to service and clean
  • Operational excellence
  • Integrated check valve that prevents backflow from outside
  • Fiber mesh premix burner
Things we like?
  • 11 GPM
  • Up to 199,000 BTUs
  • Easy push-button controls
  • Energy efficient
  • Doesn’t run out of hot water
  • Space saver
Things we don’t like?
  • Requires professional installation
  • Extremely expensive

                              Product Information

Product Dimensions                           22.05 x 14.76 x 33.86 inches

Item Weight                                          84 pounds

Manufacturer ‎                                       Rinnai

Size                                                         11 GPM

Power Source                                        Gas-Powered

Voltage                                                  120 Volts

Certification                                          Energy Star

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3-Rinnai RU130eN – Natural Gas Tankless Water Heater

Rinnai RU130eN Rinnai is the best tankless gas water heater brand. They produce multiple models including Rinnai RU 130En. It is infused with incredible specifications. They’re very few tankless gas water heaters that earned an Energy Star label.

With the spectacular 0.95 EF rating, it is 10 times more efficient than an average tankless gas water heater. It will save your time by producing hot water whenever and wherever you need it. It is equally favorable for any size of the home, even with favorable multiple fixtures. You will save your money by saving energy by operating only when you need hot water.

Key Features

  • flame rod
  • Boiling protection
  • Combustion fan RPM check
  • glass fuse
  • Remaining flame (OHS)
  • Automatic frost protection
Things we like?
  • Superb energy-efficient gas-powered heater (EF = 0.95)
  • Earned Energy Star label
  • Powerful models, ranging from 7 GPM to 11 GPM
  • Energy efficient
  • Use on natural gas and propane
  • 10-year warranty for heat exchanger
  • Space saver
Things we don’t like?
  • It’s a big heater: weighs 62 pounds
  • Has a higher price

                                      Product Information

Product Dimensions                   12 x 18.5 x 27.9 inches

Item Weight                                 71 pounds

Manufacturer                               Rinnai

Voltage                                          120 Volts

Certification                                 Energy Star

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4- Camplux CA 318 -Natural Gas Tankless Water Heater

Camplux CA 318The Camplux CA318-NG tankless Water Heater designee with sleek modern-looking black glass front panel creates part for its buyers. It has LED touchscreen controls that are easy to use it. Camplux CA318-NG can heat up to 3.18 GPM, which is sufficient for small families. Complux CA318-NG extra advanced features automatically control the temperature of your water heater.

Camplux CA318-NG is the best gas tankless hot water heater, it also has several safety measures, including a child safety lock, overheats, and flame out shutoff. In addition, the Complex 3.18 GPM tankless water heater has a revolutionary design, making it a unique tankless water heater on the market. It is perfect for whole-house use, and apartment. Camplux CA318-NG water heater designee with innovative technology and advanced protection systems to save your loved ones.

Key Features

  • You can activate only on demand
  • Easy to install
  • flexible venting
  • Easy to service and clean
  • Operational excellence
  • Sleek, modern design
Things we like?
  • Modern black front panel
  • LED touchscreen controls
  • 18 GPM Water Flow
  • On-demand high water capacity range
  • Energy efficient
  • Safety measures
  • Automatic temperature control
  • Space saver
Things we don’t like?
  • Only reads the temperature in Celsius
  • Slow flow rate

                               Product Information

Product Dimensions                                             14.37 x 4.72 x 25.39 inches

Item Weight                                                           28.7 pounds

Manufacturer                                                         Campus

Voltage                                                                    120 Volts

Flow Rate                                                                3.18 Gallons Per Minute

Water Consumption                                              12 Liters Per Flus

Power Source                                                          Gas-Powered

Usage                                                                        Indoor Use

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5-Takagi T-H3-DV-N -Natural Gas Indoor Tankless Water Heater

Takagi T-H3-DV-NTankless water heaters powered by natural gas tankless water heaters are cost-efficient than propane or electric water heaters. Takagi T-H3-DV-N is a coveted Energy Star label that will build its trust in its users.

There is a multiple tankless gas water heater that is well suited for residential and commercial applications, Takagi T-H3 best tangles natural gas water heater is one of them. It is equally suitable for residential and commercial usage such as; small restaurants, beauty salons, and offices. Takagi T-H3 complies with Ultra-Low NOx regulations. It is also suitable for heavier residential usages such as space heating or domestic recirculation systems.

Takagi T-H3 best tangles natural gas water heater because it is certified up to 10,100 ft. altitude. .95 Uniform Energy Factor, making its tankless water heater one of the most efficient heaters on the market. With gas inputs of 199,000 BTU, Takagi can produce hot water for more than 4 bathrooms in warmer climates. It means it has great proficiency to produce hot water in cold climates like Canada, the USA, and the UK.

Takagi T-H3-DV-N is the best tankless natural gas water heater, it supplies hot water directly or indirectly by using storage tanks, recirculation systems, hydronic heating systems, radiant floor systems, and domestic heating applications. The secret behind the high energy efficiency of the

Takagi gas unit is the condenser, and it can increase energy efficiency by more than 10%. The great thing about the Japan-based tankless gas water heater producers is, they offer the above-standard warranty – Heat exchanger (10 years), parts (5 years), labor (1 year). Takagi T-H3-DV-N has only one model with the powerful 10 GPM one. Therefore, it is most appropriate for middle-sized to larger households that required above-average hot water needs.

Key Features 

  • Energy Star qualified
  • utilizes commercial-grade copper alloy 25 times better than stainless steel
  • NSF certified for commercial applications
  • Complies with Ultra-Low NOx regulations of less than 14 ng
  • You can link it up to 4 units without a Multi-Unit Controller
  • You can use in the multi-unit link up to 20 units with a Multi-Unit Controller
  • Integrated controls
  • Have power cord as standard features
  • Venting with Schedule 40 PVC, CPVC, PP, Category III stainless steel
  • Safety features include freeze, overheat, surge protection, and troubleshooting diagnostic codes


  • Maximum Flow Rate: 10 GPM
  • Max BTU Input: 199,000
  • Fuel Type: Natural Gas
  • Energy Factor: 0.94
  • Gas Connection: 3/4″
  • Water Connection: 3/4″
  • Depth: 11-1/4″
  • Height: 23-5/8″
  • Width: 17-3/4″

Manufacturer Warranty 

  • 15- years limited heat exchanger
  •  5- years limited parts Residential use
  •  5-years  limited heat exchanger
  • 5- years limited parts Commercial use
Things we like?
  • Earned Energy Star rating due to high energy-efficiency
  • Energy efficient
  • Space saver
  • Yearly energy cost is near about $172
  • Easy controllable digital control system
  • Comes with a top-of-the-line Japanese standard warranty
  • Very affordable price for a 10 GPM device
  • Perfect for household use
Things we don’t like?
  • Only one available model
  • Not the easiest unit to install due to the condenser

                          Product Information

Product Dimensions                                      10.75 x 17.75 x 22.5 inches

Item Weight                                                    59 pounds

Manufacturer                                                  Takagi

Size                                                                   Medium

Power Source                                                 Gas-Powered

Voltage                                                            120 Volts

Temperature Range                                      100-185 Degrees Celsius

Flow Rate                                                        10 Gallons Per Minute

Usage                                                                Indoor use only

Certification                                                    Energy Star

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6-Noritz NRC66DVNG -Tankless Hot Water Heater

Noritz NRC66DVNGNoritz is a well-known tankless water heater company in Japan; it specialized in making HVAC devices. They produce the best gas tankless water heater_ 39 lbs NRC66DVNG model. It is the most compact and lightweight tankless gas water heater on this list. It’s an indoor water heater and has a condenser which boosts energy efficiency.

Noritz NRC66DVNG has an above 90% energy efficiency. Usually, it comes with two drawbacks; increased size and weight of the gas tankless water heater. The Noritz NRC66DVNG newest efficient condensing Tankless Hot Water Heater is made with a half-inch gas line. It is a condenser type of heater, which uses some of the heat from the exhaust to help heat the water, so due to this, it is more efficient than a non-condensing unit.

Noritz NRC66DVNG exhaust is held inside the unit until it cools, which results in less exhaust. It also allows using of more types of venting to release the exhaust. In addition, its remote thermostat features help you to set the temperature without traveling to the unit.

Noritz NRC66DVNG has an Energy Factor of 0.91 for natural gas and 0.93 for LP. These ratings are nearly 10 points higher than that of comparably sized, conventional tankless water heaters.

It would help if you were careful when installing the Noritz gas tankless water heater because it is an indoor light-weighted water unit. However, Noritz NRC66DVNG is a reliable water heater; the company gives a 10-year long heat exchanger warranty. Noritz NRC66DVNG is one of the best small gas tankless water heaters.

Its maximum hot water flow is 6.6 GPM, which is suitable for small or middle-sized families. The best energy-efficient tankless water heater that uses cheap natural gas is a financially smart investment for middle-class families.

Key Features 

  • Provide endless hot water
  • It can be vented with Schedule 40 PVC Pipe and Fitting
  • High-Efficiency tankless water heater
  • Remote thermostat and 6′ power cord included
  • High Efficiency
  • Low exhaust
  • Remote thermostat
  • .89 Uniform Energy Factor
  • Low Nox

Manufacturer Warranty 

  • 12 Year Heat Exchanger
  • 5 Year Parts, 1 Year Labor 
Things we like?
  • Small and lightweight gas tankless water heaters
  • The perfect combination of natural gas
  • Energy efficient
  • Space saver
  • High energy-efficiency
  • Schedule 40 PVC piping
  • Easy installation
  • 10-years warranty on heat exchanger
Things we don’t like?
  • Only one available model (6.6 GPM natural gas)
  • Indoor-only unit

                                  Product Information

Product Dimensions                                               6.7 x 13.8 x 23.6 inches

Item Weight                                                             11.42 pounds

Manufacturer                                                           Noritz

Power Source                                                           Gas-Powered

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7-Rinnai RU199iN  -Natural Gas Tankless Water Heater

Rinnai RUR199iN If you have a large family and you love innovative technology then Rinnai RU199 is the best option in the range of tankless water heaters.  It will provide 11 GPM hot water. This Rinnai has ThermaCirc360 Technology, which re-circulates hot water through pipes to get ultra-fast hot water.  Rinnai RU199 has Wi-Fi monitoring to monitor the efficiency of your water heater and address issues remotely before you will experience a break in service.

You will be experienced the highest flow rate of Rinnai RU199 best tankless water heaters. This would be the best option for large households.  If your family members are all on the same schedule and you have multiple bathrooms Rinnai RU199 will comfortably fulfill your hot water needs that everyone can get ready for work in the cold morning.

Key Features

  • Flame failure – flame rod
  • Boiling protection
  • Combustion fan RPM check
  • Overcurrent – glass fuse
  • Remaining flame (OHS)
  • Automatic frost protection
Things we like?
  • Energy efficient
  • Endless hot water for your entire home
  • Indoor Installation Only
  • Space saver
  • Up to 11 GPM hot water flow rate
  • Control-R 2.0 mobile app features timers and schedules
  • You can remotely put the system into vacation mode
  • 120 months- Warranty
Things we don’t like?
  • Not yet found

                                  Product information

Product Dimensions                               22.05 x 14.76 x 33.86 inches

Item Weight ‎                                             84 pounds

Manufacturer                                            Rinnai

Voltage ‎                                                     120 Volts

Certification                                             Energy Star

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8-CAMPLUX CM264-NG -Natural Gas Residential Water, Heater 

CAMPLUX CM264-NGIndoor life is always filled with many challenges, especially in a cold environment. CAMPLUX CM264 Natural Gas Water Heater can figure out your clod and rough environment and provide warmness to your love once. The Camplux CM264 Natural Gas Water Heater is the best tankless gas water heater for indoor home use. It produces 2.4 GPM hot water, which is suitable for a small family. Its compact size allows you to install it anywhere in your home.

CAMPLUX range is constantly expanding its features and quality by producing innovative tankless water heaters. It is made with a 110-volt power cord with an internal exhaust fan with a color screen and a safe electronic ignition system. You can get a comfortable shower by adjusting the water temperature.

Camplux CM264 Natural Gas Water Heater designee with new technology supports safety measures such as; overheat and low water shutoff. In addition, its digital temperature display is easy to read, and it comes with all required adaptors and installation instructions.

Key Features

  • Ease to Use for whole home
  • Indoor use with safe, efficient power ventilation
  • The perfect option for small homes, cabins, or apartments
  • Modern Design with exclusive color
  • Digital temperature display for easy to read
  • Eco and Full gas switch for energy saving
  • Safety features i-e Flame-out protection, anti-freezing protection, over-heating protection
  • Its airflow pressure switch protection to ensure the safety measures
  • Equipped with easy-to-use manual water temperature controls.

Manufacturer Warranty 

  • 1 Year Warranty
Things we like?
  • 64 GPM
  • Safety features
  • Digital temperature display
  • Small size
  • Energy efficient
  • Space saver
  • Include adaptors
  • Include installation instructions
Things we don’t like?
  • Hard to find an additional vent pipe
  • The heater shuts off randomly

                               Product Information

Product Dimensions                                    12.8 x 5.91 x 20.28 inches

Manufacturer                                                CAMPUS

Item Weight                                                 23.8 pounds

Voltage                                                         120 Volts

Power Source                                              Gas-Powered

Flow Rate                                                    2.64 Gallons Per Minute

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9- Rheem RTGH-95DVLN-2 –Tankless Hot Water Heater

Rheem RTGH-95DVLN-2Japanese tankless water heater companies are famous for introducing profound tankless natural gas water heaters at cheap prices. We have the best natural gas tankless water heater brands like Rinnai and Noritz are good examples. The company has come close to Japanese engineering gas tankless water heater models just like Rheem in the US.

Rheem is infamous to make both electric and natural gas tankless water heaters. Rheem RTG-95DVLN gas-powered mode tankless water heater with a built-in condenser. As you know, high energy efficiency is impossible to achieve without using the condenser.

Rheem tankless water heater is a pocket-friendly best-rated natural gas tankless water heater that saves 6% energy loss that will help to reduce energy expenses.

Rheem RTG-95DVLN introduces an intelligent electronic controller which maintains both the optimum heating output and increases the safety of the RTGH-95DVLN model. In such a way, the Rheem gas tankless water heater can easily heat water anywhere from 85°F to 140˚F very quickly. Moreover, by using Rheem RTGH-95DVLN, will increased energy efficiency comes low NOx emissions. Rheem RTGH-95DVLN can squeeze an additional 10-15% of the energy out of every ounce of natural gas.

To drain the water that is gathered in the condenser is quite difficult, but with With newly built real estate in Rheem RTGH-95DVLN, you can plan for the gas tankless water heater’s drainage with the condenser beforehand. Rheem RTG-95DVLN is a powerful HVAC device that can achieve the maximum hot water flow of 9.5 GPM. That’s enough, even for a large family as well.

By following Japanese standards, Rheem gives you a 10-year warranty for the heat exchanger. The Rheem offers a 12-year warranty on the heater exchanger. For the high energy efficiency and power, its price is quite acceptable. Don’t forget that having energy-efficient best gas tankless water heater will pay for itself in lower natural gas costs which is ideal for every common user.

Key Features 

  • 94%Energy efficient with stainless-steel
  • Intelligent electronic controls designed to increase energy efficiency and safety
  • Third-party Efficiency listed by AHRI
  • Up to 38-Feet of 3-Inch PVC Pipe or 5-Feet of 2-Inch PVC Pipe
Things we like?
  • Energy efficient
  • High energy efficiency with EF factor of 0.94
  • Maximum hot water flow is 9.5 GPM
  • Space saver
  • Easy controllable digital control system
  • 12-year heat exchanger warranty
Things we don’t like?
  • Not the easiest unit to install due to the condenser

                                Product Information

Product Dimensions                                   27.5 x 9.75 x 28.5 inches

Item Weight                                                 7 7 pounds

Manufacturer                                              Rheem

Material                                                        Stainless Steel

Voltage                                                        120 Volts

Maximum Pressure                                  150 Pound per Square Inch

Power Source                                             Gas-Powered

Certification                                               Energy Star, Water Sense

Usage                                                          Inside

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Benefits of Best Tankless Gas Water Heaters

The tankless water heater is the need of every house. They are proficient enough at producing a minimum of 3 GM hot water within a minute. When you choose a product for purchase, you will experience its worth. There are several benefits you will get from your tankless gas water heater, such as;

On-Demand Hot Water

Tankless units are known for their ability to deliver instant, hot water within a minute. One water unit will produce a minimum of 3 to 11 GM hot water within a minute as per your demands.

Energy Efficiency

The gas tableless water heater consumes less energy, so it will have 96% energy efficiency. Gas heaters help save money in the context of monthly bills.

Increased Lifespan

The tankless water heater is more proficient and durable. A traditional tank water heater can last up to 10 years; on the other hand, tankless gas water heaters last up to 20 years if used properly. Although they are a little bit expensive, tankless units save you money in the long term.


Tankless units are smaller than tank units; they are placed virtually anywhere. However, it is recommended that the manufacturing companies place them close to your main water-based appliance to reduce hot water lag to get better results.

Environmental Impact

Tankless Water Heater gas water heaters are environment-friendly. these units don’t affect on outer environment. They require less energy to work.

Standby Losses

Tank water heaters need to continuously reheat the water to keep its temperature high this strategy will increase your bill that you don’t want to see. On the other hand, tankless units will heat water and consume gas only when you turn on your shower or tap.

Ideal for Smaller Homes

Tankless gas water heaters are ideal for one- or two-faucet homes and even small families.

How Efficient Gas Tankless Water Heaters?

Gas tankless water heaters are very efficient, constantly keep your water hot. In addition, tankless water heaters are more durable as compare to your traditional water heaters. Finally, a tankless water heater comes with a long shelf life in both units and components. After buying a tankless water heater, you will not require yearly maintenance; you will not change your current tankless water heater in the next 15 to 20 years.

Natural gas tankless water heaters are cheaper than electricity. Best Tankless Gas water heaters can reach 96% efficiency, while most of them do not go lower than 87% efficiency. Therefore, if you choose a tankless water heater properly, you will save your money and enjoying an efficient product in the long term at cost-effective rates.

What Should You Consider When Buying a Best  Gas Tankless Water Heater?

Now you know the basics of the best tankless gas water heaters, it is time to make a purchase best tankless gas water heater. However, if you think that the models that we’ve talked about earlier don’t fit you or your needs, this means that you will need a tad more information to make a wise purchase.

To buy a gas tankless water heater, you have to consider multiple things to buy the best tankless gas water heater for your home. At the start, you also want to consider the design and features, and heating capacity to produce hot water. Therefore, I’ll tell you everything you need to know about the best tankless gas water heaters in the following lines. In the end, I hope this information helps you to make a wise choice in the context of buying the best tankless gas water heater. These points are;

Power Input

Tankless water heaters, power, and size are relatively important factors to be considered. If you need the best tankless gas water heater for your small home, then a medium-sized water heater is sufficient for a small family. The average size of the water heater produces a minimum of 4 GM host water which is enough for 2 to 3 bathrooms and one kitchen use.

Before buying a water heater, you have to make sure that the water is hot enough to satisfy your needs and expectations. When you are choosing your water heater, consider these points, such as;

  • Small spaces will require as little as— 10,000 BTUs
  • Large or commercial may require as high as– 1,000,000 BTUs

Flow Rate

Flow rate determines the amount of hot water the heater can deliver to you. The flow rate depends upon how many devices you have in your home or you want to power. For example, if you want to supply a single faucet with hot water, a flow rate of 1 GPM should be enough. However, if you want to supply all of your water-based appliances – or your entire home, then you will need a heater capable of more than 1gallons per minute.


Venting is an important factor in indoor gas water heaters. The heater eliminates hazardous gases that need to be eliminated property. In addition, a venting system will ensure additional home intake from the exterior. Gas tankless water heaters come with two venting options:

Power Venting

This type of venting requires an exhaust pipe. Before you install such a venting, make sure that the installation area has a fresh air circuit.

Direct Venting

Direct venting requires an exhaust pipe, and intake pipe. The exhaust pipe eliminates all carbon monoxide and hazardous gases, while the intake pipe ensures sufficient air intake.

Energy Factor

A gas tankless water heater can help you calculate the unit’s energy efficiency.


Condensing gas tankless water heaters can save money on installation. They will become more energy-efficient and emit exhaust air that’s cooler than non-condensing models. Condensing water heaters can also use PVC instead of metal, making a difference in expenses.


Non -condensing water heaters are perfect for outdoor placement. These models are usually cheaper, as well as smaller in size.

Best Tankless Gas Water Heaters Features and Specifications

This buyer guide section will introduce you to the most important features and specifications of the best tankless water heater natural gas. When you purchase tankless water, the heater makes sure you can visit the market before purchasing a certain unit. All these below important features and specifications you will find only in a reputable brand. Such features and specifications are;

  • Maximum Gallons per Minute
  • Proper Venting System
  • Condensing/Non-Condensing
  • Anti-Freeze/Cold Safety
  • Warranty on Heat Exchanger/Parts/Labor
  • Energy Factor that results in cost saving
  • Required Certifications
  • High enough power input

All of the above features and specifications, depending on the tankless water heart company. However, it is very important that you take your time to properly choose the best tankless gas water heater that will provide your home with a maximum range of hot water.

Installation and Maintenance of best Tankless Gas Water Heaters

Before reading any further, keep in mind that installing a gas tankless water heater is a very difficult process and requires a professional, especially if you don’t know how to handle some of the following steps.

Installation of Best Tankless Gas Water Heater

To install a tankless gas water heater, you will need spade drill bits, power drills, adjustable wrenches, screwdriver sets, torches and tanks, and reciprocating saws.  To install your gas water heater, you will need pipes, valves, gas fittings, gas connectors, tankless gas, black pipes, caulk, and sealants.

  • Install a New Gas Line – if your current gas line has the proper size, then install a valve and a tee in the existing line. Then, run a new gas supply line to the point
  • Install New Water Lines – you have to tie in new cold and hot water lines with copper pipes and run them to the new heater.
  • Mount the Water Heater – choose a suitable location for your heater and, if required, build a platform for it to stand on.
  • Connect the Water Heater – use the manufacturer’s instructions to ensure that the connections have been made properly.
  • Install the Vent
  • Turn on the Water Heater – open any faucet to full “hot”

How to Maintain Best Tankless Gas Water Heater?

When you perchance a tankless water heater, you also get an installation guidebook to install your water heater. Here in this buying guide section, I will briefly guide you on maintaining your tankless gas water heater step by step.

  • Turn the tankless gas water heater’s power off.
  • Close and turn on the three water valves that are attached to the heater.
  • Remove the caps of the purge port valves and cold-water valves
  • Link hosing lines to each of the three valves
  • Open the purge port valves
  • Use roughly 2.5 gallons of undiluted white vinegar when backing powder to cleaning your gas water heater
  • Avoid using harsh chemical solutions
  • Perform the draining and flushing procedure by following the instructions from your heater manufacturer
  • Close the purge port valves
  • Remove the hosing lines from the water valves
  • Replace the caps of the purge port valves
  • Re-start your gas water heater
  • Turn on the sink’s hot water tap to allow any air stuck inside to pass-through

You can safely clean and maintain your tankless gas water heater on your own. However, as mentioned above, if you face any hurdle to clean it, refer to a professional!

Frequently Asked Questions About Best Tankless Gas Water Heaters

Is Rinnai Better Than Rheem?

Rinnai and Rheem both offer great GPM, but Rinnai beats out Rheem. Both units’ prices are proximately the same. Rheem tankless gas water heater having lower installation costs as compere to Rinnai. It also comes with a 12-year warranty on its heat exchanger, 5 years on its parts but, on the other side, Rinnai offers a 10-years warranty on the heat exchanger and 1 year for parts.

What Is The Best Tankless Water Heater 2022?

Eccotemp i12-NG Water Heater is the best tankless water heater 2022

Are Tankless Gas Water Heaters Worth It?

Tankless water heaters use less energy because they only heat up water when their users required it. By using a tankless water heater, you can save your money in the context of your energy bill each year because they don’t waste power. Tankless water heaters are user-friendly and don’t take much space as traditional tank water heaters.

Who Makes The Best Tankless Gas Water Heater?

Rinnai Tankless water heater company makes the best tankless gas water heater.


We live in the age of advancement, where every day we get a new addition to the new and innovative home appliances tankless water heater is one of them. Every buyer wants to get the best tankless gas water heater at cheap prices. The help of my reviews and additional information that I’ve provided you regarding tankless water heaters will help to make a smart purchase if you intend to buy a water heater in the near future. All the above-mentioned water heaters are best in their quality and specification but Rinnai V65iN and Eccotemp i12-NG Water Heaters are the best Indoor Tankless gas Water Heaters due to their performance, sleek and fascinating designee and prices. However, if you may feel like an expensive initial investment, remember that there are so many people who are claiming that a tankless water heater has saved their money in the long run!

Being a buyer, you have to keep in mind all the above-mentioned details, benefits, and buying guide, as well as the pros and cons of your expecting products.  Hopefully, this review article will help you to perchance, clean, and maintain your tankless water heater.

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