Best Tankless Gas Water Heater – Buying Guide 2020

Have you been struggling to choose the best tankless gas water heater?

You are in the right place.

Imagine living in an apartment where you can get hot, searing water whenever you want, whether it is during the winter or not without spending a lot of your money on energy bills.

How would that make your life experience improve?

Without a doubt, many people want to lead such a peaceful and comfortable life but fail due to the lack of enough money and useful advice.

If you are one of them, you will agree that you desperately need an affordable but efficient alternative.

But you can find the best tankless gas water heater that will significantly change your life for the better without having to rent a room to store the traditional huge tanks.

Since we want you to get value for your hard-earned money, we have reviewed the top tankless gas water heaters to help you pick one that best suits you.

Other than that, you will learn essential tips for choosing the right products that will consistently meet your hot water requirements without breaking the bank.

Image Product Details   Price
Rinnai Ruc98in Ultra Series Gas Tankless Water Heater Weight: 82 pounds
Dimensions: 10 x 18.5 x 26 inches.
Voltage: 120 volts
Flow Rate: 9.8 GPM
Water Cosumption:9.8 gallons
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Takagi T-KJr2-IN-NG Weight: 37 pounds
Dimensions: 6.7 x 13.8 x 20.3 inches
Voltage: 120 volts
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Takagi T-KJr2-IN-NG Weight: 39 pounds
Dimensions: 6.7 x 13.8 x 23.6 inches

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Rheem RTGH-95dvln 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater Weight: 79 pounds
Dimensions: 18.5 x 9.75 x 27.5 inches

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Rinnai RU199 Sensei SE Tankless Hot Water Heater Weight: 64 pounds
18.5 x 11.45 x 31.3 inches
Voltage: 120 volts
Flow Rate: 9.8 GPM
Water Consumption: 9.8 GPM

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Rinnai Ruc98in Ultra Series Gas Tankless Water Heater

Best for Meeting High Hot Water Demand

Rinnai ruc98in ultra series gas tankless water heater is what you need if you want an option that guarantees your large family an incredibly low running cost. This is so because the water flow rate is high.

best tankless gas water heater

Top Features

If you ask most users of gas heaters one problem that they experience often, you will likely hear a lot about venting.

To prevent this issue here, Rinnai gas hot water system quipped with both twin-pipe and concentric-PVC options. This way, you have an opportunity to choose the alternative that you consider most comfortable to install and use.

Given the level of efficiency that comes with using Rinnai ruc98in ultra series gas tankless water heater, it is the best choice for you if you have a large family or live in a spacious house.

You can be sure that it will be able to supply adequate amounts of hot water to several faucets and showers at the same time consistently.

Do you believe this? To explain is in a better way for everyone, you need to consider that this heater has a 9.8 GPM water flow rate. The energy intake, on the other hand, varies between 15,200 and 199,000 BTU.

All that this means is that as long as you can pump the required gas, you will get the most wanted rate of water flow.

Some critics think that this heater pollutes the environment. However, this is untrue given that it has an Energy Efficiency rating of 0.95, which is one of the highest ratings that you can find in the industry.

  • Occupies less space despite its weight
  • Exceptional efficiency rating of 0.95
  • Plenty of hot water
  • Extremely costly
  • Bulky
  • Difficult to install

Navien NPE-240-A Tankless Gas Water Heater

Best for Time-Conscious Users

Navien has made the best use of technology to design the gas heater that addresses both current and future needs. The patented high technology ensures that you do not only get enough hot water but also wait for a short while to get it.

best tankless gas water heater

Top Features

The buffer, as well as the recirculation pump that it has, are meant to reduce your cold-water sandwich.  Besides, it reduces your water bills.

This technology achieves this by making it possible for you to get cold water within the shortest time possible.

The company is proud to have invented the best tankless gas water heater that guarantees its customers like you the opportunity to get hot water within a second.

The external interface is designed to display accurate water temperature. At the same time, it shows error codes to help you make the right actions that the most appropriate time. By using the buttons, you can adjust the way your heater operates, as you want.

Condensing technology helps to reduce the rate of energy consumption as well as the emission of carbon dioxide. This way, this tankless gas heater prevents the exhausted temperature from escalating beyond the required level.

  • Easy to install
  • Short waiting time
  • Advanced technology makes using it lively
  • Accurate temperate records
  • To control remotely, you need an extra remote controller
  • Some slight noise when in operation

Takagi T-KJr2-IN-NG

Best for Smaller Homes

takagi tankless water heater reviews

Takagi makes several high-quality tankless gas water heaters. Out of them all, this is the smallest. Due to this perfect size, you can use it if your home is tiny.

This is also the best option for you if you live in smaller apartments and have low water demands. However, that does not mean this is a powerless heater. It can serve you perfectly well if you are a family of between three and five.

Top Features

The output of Takagi T-KJr2-IN-NG is up to 6.6 GPM. With this impressive capacity, you can use it to run several loads of clothes, up to three.

Besides, four or five adults can shower at the same time, without any issue. Since this unit measures 6.7 by 13.8 by 20.3 inches, this performance is good enough. Thus, this powerful heater can meet all the needs of small families.

Since this small gas water heater is energy-efficient, you can be sure that it will help you to protect the environment. Its high Energy Star rating confirms this.

Water hardness, however, can adversely affect your heater if you fail to install the right scale inhibitor. Particles, such as minerals and others, have the potential to cause venting problems. For the best result, drill the right-sized holes to create enough room for the vents.

  • Powerful enough to meet small family needs
  • Small to fit any room
  • Environmentally friendly
  • Ten-year warranty
  • Easy to install
  • Installation mistake can cost the warranty
  • Hard water can destroy

Noritz NRC661-DV-NG

Best for Users Who Need Enough Water for Several Simultaneous Showers

If you have been using water heaters for the last few decades, you likely know about many Noritz products. This renowned company has been leading the industry for more than 60 years, and they recently introduced NRC661-DV-NG to solve the emerging needs of their customers.

This condensing heater uses gas and can provide enough hot water for your two-bathroom room.

Noritz NRC661-DV-NG

Top Features

Noritz NRC661-DV-NG has a water flow of 6.6 GPM powers. This guarantees your two-bathroom houses a continuous flow of hot water.

You can use it to get water for your washing machine as well at your shower simultaneously. Alternatively, you can also use your showers simultaneously and get an adequate supply of hot water.

This Natural gas tankless water heater is also energy efficient. Its Energy Star certification shows that this one of the gas water heaters that you need to reduce your energy bill in the best way.

For you to install it, you will be able to follow the clear and detailed instructions. You also do not need a high-temperature vent, which means you will not struggle to look for one. To install it, use the PVC pipe and the right fittings.

Unlike high-temperature vent, these are easily accessible at many of your nearest home improvement stores.

Another thing that we need to pay great attention to is the outstanding warrant. You have a 12-year warranty on this unit.

You are also guaranteed 5 years warrant of the parts and one year on labor. Due to these attractive and useful features, you may want to dig dipper into your pocket to be able to get one that is in perfect condition.

While cost is essential, you should focus more on the benefits that you will get. If you get value for your money, then that is what you have been seeking to help you meet your hot water needs at home.

  • Enough water for numerous simultaneous showers
  • Energy efficient
  • Parts are readily available
  • Long-lasting
  • One of the expensive heaters

Rheem RTGH-95dvln 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater

Best for People Living in Mountainous Areas

Some water heaters provide exceptional water supply. Others offer a decent water supply. Another group provides a good amount. Rheem RTGH-95dvln 9.5 GPM indoor direct vent tankless natural gas water heater falls in the first category.

That is one reason many people go for it. However, if this is what you are looking for, you are spoilt for options. You need Rheem RTGH-95DVLN if you want the other features that guarantee you quality service for an exceptionally long period too.

Rheem RTGH-95dvln 9.5 GPM

Top Features

Many water heaters out there have the best water flow rates. However, their accompanying technology cannot compliment this capability. Thus, they may not be what you need because you do not want to have false hopes.

The same applies to those many heaters that deliver good flow but experience lots of temperature fluctuations. This means before you choose a particular heater, you must make sure its technology can complement the high rate.

Besides, the heater should not record temperature fluctuations while it delivers the desired water flow rate.

To ensure you make the right decision, you can make Rheem RTGH-95dvln 9.5 GPM indoor direct vent tankless natural gas water heater your preferred choice.

Rheem RTGH-95dvln 9.5 GPM indoor direct vent tankless natural gas water heater is the best in this area due to the stainless steel heat exchanger that it has.

The feature allows you to connect all the two vents when you have a high demand for hot water. Once you do this, you can draw as much water as you want without having issues to do with temperature fluctuations.

If you are asking how this happens, let us consider the power specifications of this water heater. It consumes up to 199 BTUs when operating at maximum capacity. This exceptional service delivery ability does not mean it wastes energy. This heater has an impressive 0. 94 energy rating.

The RTGH-95DVLN heater also has the capacity to handle extremely low temperatures. If you expose to temperatures as low as -30 F, you can be sure that will not limit its success.

That is to say, you can use it to operate at extremely high elevations. If you are residing in a mountainous area and have been looking for the perfect water heater, this best suits you due to these valuable features.

  • Efficient temperature control
  • Can use either natural or propane gas
  • Easy-to-install instructions
  • Withstand adverse weather conditions
  • Extremely costly

Rinnai RU199 Sensei SE Tankless Hot Water Heater

Best for Large Household that Love Innovative Technology

If your family is large and you love innovative technology, this Rinnai gas hot water system is for you. It will cost you a little more than many other options out there. But if you consider how much it will help you, you will agree that it is incredibly affordable.

rinnai gas hot water system

Top Features

Rinnai RU199 provides a lot of hot water at 11 GPM. If you compare this level of flow with that of Rinnai V75, which is at 7.5 GPM, you can appreciate that it values more. It is also better than Rheem, which provides hot water at 9.5 GPM.

The ThermaCirc360 Technology that Rinnai has used to build this heater enables it to recirculate the water throughout the system. They ensure you get your water within a short time. I hope you can see why this feature is essential to you.

For you to understand this correctly, let us compare it with the old tank water heaters. As you wait for the water flow from your old tanks to the shower, you waste lots of water.

In most cases, people lose as much as 24 16 oz bottles whenever they use their heaters. Families could lose up to 8,700 bottles every year for every person.

The new technology ensures that you save all these resources and get hot water ultra fast. Another vital feature is the WiFi monitoring that enables your service provider to keep an eye on the effectiveness of Rinnai RU199. This way, they can address many issues that may trouble you remotely.

  • Efficient for large households
  • Endless water supply
  • Energy efficient
  • Clear and easy-to-understand instructions
  • May be slow (if you have not installed return line)

Buying Guide

If you are looking for an energy-efficient and cost-effective way to get a continuous supply of hot water, check tankless water heaters. Most of the traditional alternatives are not reliable. For you to get the best tankless gas water heater, however, you need to consider the following.

Cost of Installation

The cost of installation can make a heater you bought at a low price to be too expensive. If you will be hiring an expert to install it, add that cost to the buying price and then decide whether it still makes sense to you. In case it does not, you may consider another better alternative.


Your warranty conditions may also influence whether you can install your heater alone or not. Consider this before you volunteer to do this without the help of an accredited expert.

Besides, you may need to choose a heater that has several years of warranty to guarantee you low maintenance costs and mitigate loss.

Energy Efficiency

Not all tankless gas water heaters are created equal. Despite almost all of them being known to energy efficient, they have different Energy Factors.

The best one should have a high EF rating. When you find yourself in a situation where the energy factor is not desirable, you should consider whether it would give you the best experience as well.

Size and Flow Rate

Let your needs determine whether you will buy a large or small tankless water heater. If you are like most people, you may need to go for a compact size to save a lot of space. Do not forget about the flow rate. The best flow rate should be between 2 and 5 GPM.

Bottom Line

When you want to purchase the best tankless gas water heater, put all your unique needs into consideration. You do not want to get a sub-standard product. Once you know what you want, do some research to understand where option. Remember to exercise due diligence throughout this process.

Do not forget to look at the buying guide because it can help you to choose the best water heater according to your requirements. If you do all these, you will save time, energy, and money but still enjoy your life despite the weather drawbacks or other challenges in your place of residence.