Best Tankless Gas Water Heater Reviews

Looking for the Best Tankless Gas Water Heater on the current market for your or home? then you have come to the right place we check out the top 10 best gas water heaters on the market. We will offer you individual reviews of each of these products to help you get the best one for your needs. Thanks to our buying guide, you will know exactly what to look for before making this purchase! we will offer you a huge wealth of knowledge and tips on selecting the best water heater unit that meets your expectations, and most importantly,  your budget. Water heaters are generally expensive but essential items to maintain an efficient living cost, but buy choosing a gas tankless water heater, it might be worth a while since gas is way cheaper than electricity.

Name and modelHot Water Capacity (Gallons per minute)Main FeaturesAvg.Rating
Eccotemp FVI-12-NGFrom 0.93 to 4.8 GPM
  • Reasonably energy efficient
  • Only use gas when hot water is on
  • Digital display
3.4 Star Rating
Rheem RTG-64DVLN Prestige Low NOxFrom 5.6 to 6.8 GPM
  • Minimum flow rate of .26 GPM
  • Instant hot water
  • Water saving setting
  • Extensive Warranty
4.5 Star Rating
Rheem RTGH-95DVLNFrom 5 to 9.5 GPM
  • One of the most efficient water heaters
  • A built in self-diagnostic system
  • Instant hot water
  • Extensive Warranty
4.3 Star Rating
Rheem RTGH-84DVLNFrom 3.9 to 8.4 GPM
  • High Altitude Capability
  • Easy to install
  • Digital Display
  • Water Saving Features
4.3 Star Rating
Takagi T-K4-IN-LP8.0 GPM
  • 8 GPM max flow rate. Water connection location- bottom
  • 4-Inch category III stainless steel venting required
  • Inlet, outlet thermistors for constant temperature monitoring
  • Energy factor of 0.81-0.83
4 Star Rating
Takagi T-H3-DV-NUp to 10 GPM
  • Max flow rate of 10 gallons per minute
  • Energy factor of 95%
  • Built in diagnostics
  • An internal temperature controller
4 Star Rating
Marey Power GasFrom 2.7 to 3.1 GPM
  • Energy Efficient
  • Compact Design
  • 5 Year Warranty
3.8 Star Rating
bosh thermBosch Therm 520 HNFrom 3.4 to 5.2 GPM
  • A turbine powered ignition
  • Hydro-power ignition requires no electricity
  • Energy factor rating of 80%
  • Light weight and compact design
3.5 Star Rating
Rinnai RL75iNFrom 4.3 to 7.5 GPM
  • Energy factor rating of 82%
  • Temperature settings range from 98°F – 140°F
  • Can be used in a commercial capacity
  • 12 Year Warranty
4.3 Star Rating
Rinnai RL94iNFrom 4.3 to 9.4 GPM
  • Energy factor rating of 83%.
  • Temperature settings range from 98°F – 140°F
  • Can be used in a commercial capacity
  • 12 Year Warranty
3.6 Star Rating

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Top 10 Gas Tankless Water Heaters Reviews

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1. Eccotemp FVI-12-NG High Capacity Gas Tankless Water Heater Review

The Eccotemp FVI-12-NG High Capacity Tankless Gas Water Heater is a decent option for anyone who needs a reliable tankless heater at a modest price. The 4 gallon per minute yield is lower than many other models, but it is ideal for smaller residences or places of business where large amounts of hot water aren’t necessary. With an energy factor of 79%, the FVI-12-NG is a good all around no-frills gas tankless water heater.

Features:

  • The attractive, modern design of the Eccotemp FVI-12-NG makes this a good model for just about any location.
  • Its compact size, Height 24.75” x Width 15.5” x Depth 6” means that it can fit on just about any wall without taking up valuable space.
  • The gas rate ranges between 25,000 and 74,500 BTUs, giving this unit more than enough heating capability for moderate hot water demands.
  • The hot water capacity of this unit ranges from 0.93 to 4.8 GPM.
  • With an energy factor of 79%, the FVI-12-NG proves reasonably energy efficient at its task. Additionally, the unit will only use gas when the hot water is turned on.
  • Separate manual controls provide precision water flow and temperature adjustment.
  • The 4 gallon per minute flow rate offers the perfect amount of piping hot water for moderate demands.
  • An easy to read digital display makes it easy to keep up with the water and gas settings.
  • The electronic ignition system is guaranteed to be both safe and reliable.
  • A 2-year manufacturer’s warranty ensures the quality of this unit.

Contents Include

  • Tankless water heater unit
  • Stainless steel vent kit
  • Power cord for 110 volt power supply

Convenience-

The Eccotemp FVI-12-NG is the essence of convenience. Installation requires nothing more than wall mounting and connecting to a natural gas supply and a 110 volt power supply. The vent kit is a snap to install, with easy to follow instructions included.

Pros of the Eccotemp FVI-12-NG:

  • The compact size of this unit makes it ideal for small locations, such as cabins, office sites and small homes.
  • The FVI-12-NG is very reasonably priced, making this unit a balance of value and simplicity.
  • With a range of 0.93-4.8 GPM, this is an ideal unit for any environment that requires a moderate amount of hot water use.
  • Installation is easy enough for anyone to be able to perform.

Cons of the Eccotemp FVI-12-NG:

  • The maximum hot water capacity of 4.8 GPM restricts this unit to smaller homes and environments requiring modest hot water production. This should not be used for larger homes or any environment which requires large amounts of hot water on a regular basis.

Customer Feedback-

Positive Feedback Includes:

  • The FVI-12-NG is reliable for modest hot water needs.
  • The price is very reasonable, especially compared to professionally installed options.
  • Operating the unit is easy, once you get a feel for how the unit works.
  • Installation was simple and required no additional parts.

Negative Feedback Includes:

  • Some customers found that this unit did not have the hot water capacity necessary for baths or showers.
  • Some customers had issues with the size of the fittings, requiring extra effort when attaching to gas and electric sources.

In Summary-

All in all, the Eccotemp FVI-12-NG seems to a reasonable option for any place that has low to moderate hot water needs. A rating of 3.4 stars out of 5 stars, from 120 customer reviews, shows this unit to be average. Great for office spaces or small vacation style homes, the FVI-12-NG is probably not recommended for anything more demanding.

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2. Rheem RTG-64DVLN  Tankless  Water Heater Review

When you research tankless water heater brands, Rheem comes up as one of the most respected names in the business. Combining reliability, state of the art technology, and simplicity of design, Rheem offers tankless gas water heaters for just about any level of demand. Additionally, Rheem units offer low NOx options in its RTG series, making these models ideal for anyone who is concerned for their impact on the environment. With an energy factor of 82%, the RTG-64DVLN provides plenty of hot water while still being energy efficient. Ideal for moderate hot water demands, this unit can be used in any small to medium size home.

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Features:

  • The Rheem RTG-64DVLN measures in at 26”H x 14”W x 10”D, making it small enough to be able to mount on just about any wall.
  • Electronic controls enable you to increase the safety and efficiency of this unit’s performance.
  • A minimum flow rate of .26 GPM ensures that hot water will be available even for the smallest demand.
  • The hot water capacity ranges from 5.3 gallons per minute at a 45 degree F rise, to 6.8 gallons per minute at a 35 degree F rise.
  • The hot-start program feature enables instant hot water, regardless of downtime.
  • Protected against extreme cold weather, this unit is designed to withstand temperatures as low as -30°F.
  • Low NOx technology makes this unit more environmentally friendly than many other models.
  • The RTG-64DVLN is designed for use in all altitudes, capable of enduring heights of up to 9,840 ft. above sea level.
  • Direct vent system means all the air used in the unit comes from the outside, rather than from inside the home.
  • A water saving setting increases the water efficiency of the unit, saving up to 1,100 gallons per year.
  • A digital remote control is included, providing an extra level of convenience for the user.
  • The built in self-diagnostic system allows the user to keep up with the performance of the unit.
  • A Maintenance Notice Setting informs the user when service to the unit is required.
  • Rheem offers an extensive warranty for its product, including a 5-year parts warranty, a 1-year service warranty and a 12-year heat exchange warranty.

Contents Include:

  • Tankless gas water heater unit
  • Digital remote control
  • 10 ft. of thermostat wire
  • 120 volt electric power cord

Convenience-

Despite its weight (54 pounds), the Rheem RTG-64DVLN is fairly easy to install, even for someone doing it for the first time. The relatively compact size of the unit means that it can be mounted onto just about any wall available. All connections are matched to standard gas and electrical supplies, meaning that no additional adaptors are required. Digital settings and readouts allow for more precise control, allowing the user to get the most from this tankless water heater.

Pros of the Rheem RTG-64DVLN:

  • The advanced technologies in this unit make it very efficient in terms of both water use and energy use.
  • Extreme conditions are no problem for this unit, as it is designed to withstand very cold temperatures and very high altitudes.
  • Hot water is instantly available with the RTG-64DVLN, meaning you don’t go through water temperature fluctuations while the unit heats up.

Cons of the Rheem RTG-64DVLN:

  • Ventilation parts are not included. This won’t be a problem if you already have a vent in place, but it will add expense if you don’t.

Customer Feedback--

Positive Feedback Includes:

  • This unit provides plenty of hot water for the needs of an average size home.
  • Energy and water efficiency showed savings immediately.
  • Customers commented on the quality of the product itself, including the construction and design.
  • Easy enough to install for anyone with basic handyman skills.

Negative Feedback Includes:

  • Extra parts necessary for installation, increasing the cost of the unit.
  • Direct vent design makes the parts needed for ventilation more expensive than other designs.

In Summary-

With a customer rating of 4.5 stars out of 5 stars, from 28 customer reviews, the Rheem RTG-64DVLN has been well received so far. Providing enough hot water for moderate to above moderate hot water demands, this unit is ideal for midsized homes. The energy and water saving technology in this unit’s design makes this tankless gas water heater one that will pay for itself with the savings to your water and energy bills. Additionally, the durability of this unit makes this a good choice for anyone who lives in environments of high altitude or extreme cold weather.

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3. Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater Review

The Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater is receiving top ratings in many tankless gas water heater reviews. Combining the advanced technologies of the Rheem RTG series with a powerful 9.5 gallon per minute capacity, this unit promises to meet virtually any demand. Installation of this unit is relatively easy, requiring little more than basic plumbing and electrical knowledge. Providing a balance of performance and simplicity, the RTGH-95DVLN is a prime choice for any location that requires large quantities of steaming hot water.

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Features:

  • An energy efficiency rating of 96% makes this one of the most efficient tankless gas hot water heaters on the market.
  • Safety and energy efficiency are ensured with highly precise electronic controls.
  • A water saving setting minimizes the water this unit uses, saving up to 1,100 gallons per year.
  • The low flow design ensures that hot water is available in even the smallest quantities.
  • Compatible with a recirculation pump (not included) to provide instant hot water every time.
  • A built in self-diagnostic system allows the user to keep up with the performance of the unit.
  • The Maintenance Notice Setting informs the user when service to the unit is required.
  • A built-in condensate neutralizer makes this unit safer for the environment by reducing the acid levels of the condensate.
  • The PVC 2-pipe direct vent system ensures the unit gets all the air that it needs from outside your home.
  • Hot-start technology reduces water temperature fluctuation due to inactivity or low hot water demand.
  • Easy to read digital display helps to make programming the unit easier and more accurate.
  • Extreme altitude design enables this unit to perform in altitudes of up to 9,840 ft. above sea level.
  • Cold weather design keeps this unit operating in temperatures as low as -30°F.
  • A digital remote control adds a whole new level of convenience for the user.
  • Rheem offers an extensive warranty for its product, including a 5-year parts warranty, a 1-year service warranty and a 12-year heat exchange warranty.

Contents Include:

  • 120 volt electric power cord
  • Tankless gas water heater unit
  • Digital remote control
  • 10 ft. thermostat wire

Convenience-

Like all Rheem RTG models, the RTGH-95DVLN is designed to be as compact as possible. Measuring in at 27.5” x 18.5” x 9.8”, this unit can fit easily onto even the smallest wall space. Mounting will require a little more effort as this model weighs in at an impressive 79 pounds. Even so, installation requires only a basic knowledge of plumbing and electrical work, as the unit is ready-fit to be connected to standard water and gas lines. An easy to read digital display makes programming fast and easy, and the self diagnostic technology in this unit will alert the user to any issues which require attention. All in all, this tankless gas water heater is guaranteed to provide an endless supply of hot water as well as considerable peace of mind.

Pros of the Rheem RTGH-95DVLN:

  • The simple design of the unit makes it fairly easy to install.
  • A high flow rate of 9.5 GPM makes this model capable providing for even the highest of hot water demands.
  • Energy and water saving features make this unit one of the most efficient units available.

Cons of the Rheem RTGH-95DVLN:

  • Additional parts will be needed for the ventilation system installation.
  • The weight of the unit means that extra support will be needed when mounting to the wall.
  • Even though it is reasonably priced, all of the features that come with the RTGH-95DVLN increase the cost of the unit.

Customer Feedback-

Positive Feedback Includes:

  • Customers have reported that the unit is very quiet when in use.
  • The 9.5 GPM water capacity provides enough water for even high hot water demands.
  • Installation was fairly straight forward.

Negative Feedback Includes:

  • Some customers have had issues with the unit failing after a couple of years.

In Summary-

Overall, the Rheem RTGH-95DVLN is a reliable, efficient and durable natural gas tankless water heater. Packed with loads of water and energy saving technology, this model boasts one of the highest energy factors on the market. Additionally, a customer rating of 4.3 stars out of 5 stars, from 85 reviews, demonstrates just how well this unit has been received so far. For reliable hot water in any high demand environment, the RTGH-95DVLN is a unit that is guaranteed to impress!

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4. Rheem RTGH-84DVLN Indoor Direct Vent Natural Gas Condensing Tankless Water Heater Review

The Rheem RTGH-84DVLN is another revolutionary design that has received praise in many hot water heater reviews. This unit provides a flow rate of 8.4 GPM, while offering all of the innovative features you would expect to find in a Rheem product. Furthermore, its EF rating of 82% makes it one of the best gas tankless water heaters in terms of efficiency.

Features:

  • The high-altitude capability of this unit means it can operate at heights of up to 9,840 ft. above sea level.
  • The Rheem RTGH-84DVLN is designed to operate in temperatures as low as -30°F.
  • A digital remote control adds convenience to any user.
  • Standard size connections make this model easy to install.
  • A self-diagnostic system ensures that this unit will perform to optimum levels at all times.
  • In the event of any malfunction, the Maintenance Notice Setting will alert the owner with a warning code identifying the issue.
  • An easy to read digital display enables simple and precise programming.
  • The hot-start design of this model ensures that hot water is available regardless of downtime.
  • A water savings setting reduces water use by up to 1,100 gallons per year.
  • Low flow fixture compatibility provides hot water in even the smallest amounts.

Contents Include:                                                   

  • Tankless gas water heater unit
  • 120 volt power cord
  • Digital remote control
  • 10 ft. thermostat wire

Convenience-

With standard size connections, installing the Rheem RTGH-84DVLN is as straightforward as it gets. All that is needed is a basic knowledge of plumbing and electrics. Once installed, the RTGH-84DVLN is self sufficient, letting you know whenever it requires servicing. All you need to do is enjoy the hot water it provides!

Pros of the Rheem RTGH-84DVLN:

  • The 8.4GPM capacity is enough for any midsize to large size dwelling.
  • The RTGH-84DVLN has all of the innovative technologies offered by Rheem.
  • Installation is relatively straight forward.
  • Measuring in at 9.8 x 18.5 x 27.5 inches, this unit can fit on just about any wall space available.
  • This unit is low NOx rated.

Cons of the Rheem RTGH-84DVLN:

  • Additional parts are required for the ventilation system.

Customer Feedback-

Positive Feedback Includes:

  • Easy to use, and reliable
  • Can be installed anywhere, including the attic
  • Fairly quiet while in use

Negative Feedback Includes:

  • Can take a while to install
  • Extra parts needed increases the cost

In Summary-

With a customer rating of 4.3 stars out of 5 stars, from 21 reviews, this unit has been very well received thus far. Offering a balance of simplicity, efficiency and reliability, this is one of the best tankless gas water heaters on the market.

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5. Takagi Indoor Tankless Water Heater Review

Takagi T-K4-IN-LP is a 6.6 GPM capacity tankless propane water heater that has met with wide acclaim. Numerous tankless propane water heater reviews have placed this model in the ‘must buy’ category for any person with a low to moderate hot water demand. With an abundance of safety features and efficiency ratings, this model does credit to Takagi, the manufacturer of the first tankless water heaters in the US market.

Features:

  • A digital remote control means that you are only a push of a button away from piping hot water.
  • With an energy factor of 82%, this unit is a good balance of performance and efficiency.
  • A built-in self diagnostic system ensures that this unit performs to peak levels at all times.
  • The Takagi T-K4-IN-LP is rated as Ultra-Low NOx yielding.
  • The 8.0 GPM capacity means that this unit can provide the same hot water yield as a 40 gallon traditional water heater.
  • A 15-year limited heat exchanger and 5-year limited parts warranty covers this model.

Contents Include:

  • Tankless propane water heater unit
  • Remote control
  • 120 volt power cord

Convenience-

Measuring at 20.3”H x 13.8” W x 6.7 “D, this unit can fit into even the smallest wall space. The 33 lbs weight means that installation will be easy, even for just one person. Once installed, this unit will provide hot water for 1 or 2 bathrooms without issue.

Pros of the Takagi T-K4-IN-LP:

  • The small size of the unit makes it easy to install just about anywhere.
  • Under normal household use, this unit is expected to last up to 10 years.
  • Altitude adjustment settings enable this unit to be used in any elevation up to 6,000 ft.

Cons of the Takagi T-K4-IN-LP:

  • The warranty requires professional installation, which can be quite costly.
  • The 8.0 GPM capacity makes this unit unsuitable for larger houses or any location with high hot water demands.
  • This unit can only accommodate one high demand hot water function at a time.

Customer Feedback-

Positive Feedback Includes:

  • The small size of this model is a huge plus with customers
  • Many customers have praised the reliability of this model

Negative Feedback Includes:

  • The requirement of professional installation creates a huge increase in cost
  • Ventilation parts are extra

In Summary-

The Takagi T-K4-IN-LP has received a rating of 4.5 stars out of 5 stars, from 180 reviews, making it one of the top rated units in tankless hot water heater reviews. With a compact design and a 8.0 GPM capacity, this model is ideal for any small to midsize residence. Its reliability and durability make this model an all around good pick. The ultra-low NOx rating also makes this a perfect choice tankless propane water heater for anyone concerned about their impact on the environment.

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6. Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater Review

The Takagi T-H3-DV-N boasts an energy factor of 95 %, making it one of the most energy efficient tankless gas water heaters on the market today. This high EF rating is only matched by the high capacity this unit offers. At 10 GPM, the T-H3-DV-N is capable of providing for even the highest hot water demand.

Features:

  • The Takagi T-H3-DV-N has a max flow rate of 10 gallons per minute.
  • This unit is Energy Star compliant, with an energy factor of 95%.
  • The condensing system of this model turns the steam created into water that can be drained rather than vented.
  • This unit boasts one of the highest water temperatures available, maxing out at 185°F.
  • This model utilizes safe electric ignition.
  • Built in diagnostics to keep the unit running in perfect condition at all times.
  • The Freeze Protection System enables this unit to be used in even the coldest climates.
  • Multiple link capability provides for up to 20 units.
  • The T-H3-DV-N has an Ultra-Low NOx emissions rating.
  • An internal temperature controller maintains consistent water temperatures.

Contents Include:

  • Tankless gas water heater unit

Convenience-

With a multi-link capacity capable of servicing 20 separate units, this model can provide one stop shopping for any large residence or commercial location. While professional installation is required for the terms of the warranty, once installed, the T-H3-DV-N will prove completely hassle free. A built-in diagnostic system will ensure that the unit is in peak working condition at all times, while alerting the owner when service is required.

Pros of the Takagi T-H3-DV-N:

  • The 10 GPM capacity is one of the highest you will find in a tankless system.
  • The high capacity of this unit means that it can serve in high demand environments, including large residential and even commercial.
  • A maximum water temperature of 185°F ensures you get better than the lukewarm water provided by many other models.

Cons of the Takagi T-H3-DV-N:

  • The price of this model is not for the faint of heart.
  • Additional parts may be required for installation, increasing the cost.
  • Professional installation is required for the warranty, increasing the cost even further.

Customer Feedback-

Positive Feedback Includes:

  • Hot water temperature is the best of any tankless system
  • This model provides plenty of hot water for multiple hot water tasks
  • The energy efficiency really makes a difference

Negative Feedback Includes:

  • The cost of professional installation is a bit of an issue
  • Some units have struggled with extremely cold temperature environments
  • A few models stopped working after only a couple of years

In Summary-

With a rating of 4.4 stars out of 5 stars, from 48 reviews, this model holds one of the highest scores in tankless water heater reviews. Providing one of the highest EF ratings, along with one of the highest max flow rates, the Takagi T-H3-DV-N is guaranteed to outperform just about any other model. Additionally, the maximum water temperature of 185°F puts most other tankless water heaters to shame. Overall, the T-H3-DV-N is designed to provide the hottest water in the largest capacity. This is by far the best tankless water heater for any large residence or commercial use location.

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7. Marey Power Gas 10L Digital Panel Tankless Water Heater Review

The Marey Power Gas 10L Digital Panel Tankless Water Heater is one of the smallest and cheapest tankless gas water heaters on the market. While its 3.1 GPM yield is insufficient for anything more than the most basic hot water needs, this unit is reliable and efficient in supplying those needs.

Features:

  • This model provides a maximum flow rate of 3.1 gallons per minute.
  • This unit has an energy factor range of 87% to 54% .
  • An easy to read digital display ensures accurate and precise programming.
  • Independent knobs control both the gas pressure and the water flow rate.
  • Energy efficient design means that the unit only uses gas while water is in motion.
  • The system requires no electricity.

Contents Include:

  • Tankless gas water heater unit

Convenience-

The compact design of the Marey Power Gas 10L makes it very handy for small locations, such as office spaces or small cabins. Measuring in at 24″ x 14″ x 7″, this unit can be placed on any wall space available. Additionally, at just 21 lbs, this model can be easily installed by just one person.

Pros of the Marey Power Gas 10L:

  • The low cost of this unit makes it a good choice for anyone who needs a low yielding tankless water heater.
  • The small size of this model makes it easy to install anywhere.

Cons of the Marey Power Gas 10L:

  • The low flow rate of 3.1 GPM means that this unit can only provide enough hot water for low demand tasks.
  • The low flow rate means that only one hot water task can be done at a time.

Customer Feedback-

Positive Feedback Includes:

  • A very inexpensive tankless water heater
  • Easy to install

Negative Feedback Includes:

  • Water flow too low for anything more than washing dishes or other light hot water demand tasks

In Summary-

Having received a rating of 3.8 stars out of 5 stars, from 117 customer reviews, this unit is one of the more averagely ranked models in tankless gas water heaters reviews. That said, it was never designed to provide for more than the most basic hot water needs. For any office space, small cabin or even small apartment, the Marey Power Gas 10L will prove both reliable and very cost effective. Additionally, the energy efficiency of this model makes it very environmentally friendly.

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8. Bosch Therm 520 HN NG (Natural Gas) Whole-House Tankless Gas Water Heater Review

When you think of home appliances, the name Bosch is one of the first that will spring to mind. Renowned for being both reliable and innovative, Bosch units always gain respect and admiration from consumers and industry experts alike. The Bosch Therm 520 HN NG is Bosch’s answer for a standard, no frills, reliable tankless gas water heater.

Features:

  • The flow capacity range for the Bosch Therm 520 HN NG is between 3.4 GPM at 55 deg temp rise and 5.2 GPM at 35 deg temp rise.
  • This unit is capable of performing at altitudes of up to 4,500 ft. above sea level.
  • A turbine powered ignition system eliminates the need for a pilot light or electric ignition system.
  • This model has an energy factor rating of 80%.
  • Bosch covers this model with a 15-year limited warranty for the heat exchanger and a 2-year warranty on other parts and components.
  • This unit weighs 35 lbs and measures H25.75” x W16.73” x D8.66”.

Contents Include:

  • Tankless gas water heater unit

Convenience-

The Bosch Therm 520 HN NG is both light weight and compact, making it easy to install, even for a single person. With no electrical connection needed, it requires little more than some minor plumbing skills to properly hook up.

Pros of the Bosch Therm 520 HN NG:

  • The flow rate is plenty for moderate hot water demands.
  • Not requiring electricity helps make this model more energy efficient.
  • The light weight and compact design of this unit means it can fit anywhere.

Cons of the Bosch Therm 520 HN NG:

  • The capacity of this unit makes it capable of only managing 2 hot water tasks at a time.
  • This unit lacks some of the bells and whistles of other models available.

Customer Feedback-

Positive Feedback Includes:

  • Several customers claim that this model can provide sufficient hot water for regular tasks
  • Installation is straight forward

Negative Feedback Includes:

  • Several reviews claim that this unit struggles to provide a continuous flow of hot water, especially in colder climates
  • This model is not freeze area safe

In Summary-

The Bosch Therm 520 HN NG has struggled a bit in gas tankless water heater reviews. Its 3.5 star out of 5 star rating, from 11 reviews, is surprisingly low for a Bosch item. While the unit is fairly reliable, it is considered very average overall. Unable to endure extreme temperature or elevation levels, this model is best suited to office and moderate commercial use. Not recommended for anything more than the most basic of hot water demands.

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9. Rinnai RL75iN Natural Gas Tankless Water Heater Review

When you browse on demand water heater reviews, Rinnai is the name that seems to always have the highest scores. With a balance of compact design, energy efficiency and high water capacity, the RL75iN is Rinnai’s tankless water heater gas solution to any low to moderate hot water needs.

Features:

  • The RL75iN has a water capacity of up to 7.5 gallons per minute.
  • This unit has an energy factor rating of 82%.
  • The water temperature settings range from 98°F – 140°F residential, climbing to as much as 185°F when used with a commercial settings controller (not included).
  • This unit weighs in at 45 lbs., and measures H23” x W14” x D9.3”.
  • Rinnai covers this tankless gas water heater with a 12-year warranty for the heat exchanger, a 5-year warranty on parts, and a 1 year warranty on labor.
  • This model is Energy Star compliant.

Contents Include:

  • Tankless gas water heater unit

Convenience-

While the hookups are relatively straight forward, the weight of this model makes it a bit more complicated to install. Most people who purchased this unit had it professionally installed. Once installed, however, this unit is very easy to operate. An easy to read digital display makes programming simple and precise, and the self diagnostic system ensures that the unit performs to optimum levels at all times.

Pros of the Rinnai RL75iN:

  • The maximum capacity of 7.5 GPM means this model can provide enough hot water for multiple tasks at once.
  • The EF rating of 82% means this model will be very cost effective regarding energy usage.
  • This unit can be used in a commercial capacity with the purchase of a commercial settings controller.
  • The compact size of this model makes it easy to install anywhere.
  • Direct venting allows this unit to be installed in any room.

Cons of the Rinnai RL75iN:

  • At 45 lbs., this unit is a challenge to install.
  • Extra parts are needed for vent installation.

Customer Feedback-

Positive Feedback Includes:

  • Installation is fairly straight forward
  • Plenty of hot water for showers and other functions to happen at the same time
  • Cheap to run

Negative Feedback Includes:

  • It takes a while to get the hot water flowing
  • Not a good unit for minimum flow usage

In Summary-

With a rating of 4.3 stars out of 5 stars, from 91 customers, this is one of the most highly regarded models found on any instant hot water heater reviews. Providing both a high capacity rate and a strong energy factor, the RL75iN is an all round good choice for just about any low to moderate hot water demands.

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10. Rinnai RL94iN Natural Gas Tankless Water Heater Review

The Rinnai RL94iN is the big brother version of Rinnai’s RL75iN tankless gas water heater. With all of the features and benefits of the RL75iN, this model provides the added benefit of a water capacity rate of 9.4 gallons per minute. This is Rinnai’s answer for any moderate to high hot water demands.

Features:

  • The RL94iN has a water capacity of up to 9.4 gallons per minute.
  • This unit has an energy factor rating of 83%.
  • The water temperature settings of this model range from 98°F – 140°F residential, climbing to as much as 185°F when used with a commercial settings controller (not included).
  • This unit weighs in at 50 lbs., and measures H23” x W14” x D9.3”.
  • Rinnai provides this tankless gas water heater with a 12-year warranty for the heat exchanger, a 5-year warranty on parts, and a 1 year warranty on labor.
  • The RL94iN is Energy Star compliant.

Contents Include:

  • Tankless gas water heater unit

Convenience-

The 50 pound weight of this unit means that it will require more effort for installation. That said, many customers choose to have Rinnai experts install the unit professionally. Not only does this save time and hassle, but it also ensures that the unit will perform to its optimum expectations. Once installed, the RL94iN is virtually carefree. The self diagnostic system will alert the owner to any potential problems. Otherwise, this unit will provide endless amounts of hot water to satisfy even the highest hot water demands.

Pros of the Rinnai RL94iN:

  • Internal sensors help detect and prevent mineral deposits from hard water.
  • Internal diagnostics ensure that the system is in peak performance.
  • The 9.4 GPM capacity allows for multiple hot water functions to be performed simultaneously.
  • This model can be converted to propane.

Cons of the Rinnai RL94iN:

  • The high capacity of this model means that it comes at a higher cost, perhaps beyond many budgets.
  • The weight of this model makes it harder to install.

Customer Feedback-

Positive Feedback Includes:

  • Many customers were impressed that there is no ‘sandwich effect’ when changing the temperature
  • The temperature of the water was higher than many other models
  • This unit provides a reliable flow of hot water

Negative Feedback Includes:

  • Some customers complained about the wait time before the hot water was available
  • Installation was more difficult than other models

In Summary-

With a rating of 3.6 stars out of 5 stars, from 85 customer reviews, this model falls shorter of its 7.5 GPM counterpart. Much of the negative feedback seems to do more with shipping issues and customer service complaints, thus not reflecting the performance of this model. From the positive feedback it seems that the RL94iN performs its task admirably well, maintaining the high expectation of a Rinnai product. All in all, this is a good choice for a reliable tankless gas water heater that can provide for moderate to high hot water demands.

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Our Pick for the Best Gas Tankless Water Heater

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When comparing all of the features and benefits of the gas tankless water heaters available, our overall finding was that the Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater was the best option all round. The fact that it has a water capacity of 9.5 GPM means that it can withstand even the highest of hot water demands. This means you can take your shower while washing dishes and doing laundry, a huge plus for bigger houses with larger families. Additionally, this water flow rate is enough for even commercial hot water demands. The EF rating was a whopping 94%, making this unit one of the most energy efficient models on the market today.

Low NOx emissions, electronic controls, and a digital remote control all round off the already impressive list of bells and whistles offered by this top notch model. Admittedly, this model is pricier than many of its counterparts, but when you consider all of the benefits it offers, then the price seems more reasonable. Finally, this unit received a rating of 4.3 stars out of 5 stars, which is one of the highest scores on tankless water heater reviews. This means that the customers who purchased this unit are very happy with its performance. Therefore, the Rheem RTGH-95DVLN receives our rating as the best natural gas tankless water heater available.

 

Guide to Choosing the Best Gas Tankless Hot Water Heater

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When choosing the best on demand water heater for your needs, there are several variables that you must first consider. Needless to say, not all tankless water heaters are created equal. Some offer little more than the most basic hot water supply, while others provide a significantly greater amount of water at even higher temperatures. In addition, some models have more advanced technologies that can improve energy efficiency and maintain the model’s performance for years of use. Here are some of the main points to consider when choosing the tankless gas water heater for you:

The Advantages of a Tankless Gas Water Heater

Most people who purchase a tankless water heater do so in order to replace their old traditional tank water heater. There are two main reasons why people switch over from a traditional tank model to a tankless version. First, tankless water heaters don’t leak. Many times when a water heater dies, it does so by leaking most or all of its water contents. This can be devastating when you have a unit that holds 40 or more gallons of water! The cost of repairing water damaged carpet, floors and even walls can really add up. Thus, tankless water heaters are seen as a far safer option than their traditional counterparts.

The second thing to consider is energy efficiency. The concept of tank water heaters is that the unit maintains the contents of the tank at a certain temperature. This is like simmering a pot of water on the stove continuously. Needless to say, the energy it takes to heat and maintain a 40 gallon tank of water is nothing to sneeze at. Whether it’s a gas unit or an electric one, any tank water heater will prove costly on anyone’s power bill. By contrast, tankless water heaters only heat the water that passes through them. Thus, until the hot water is turned on, little to no energy is used.

Water Capacity or Flow Rate

As a result of this difference in design, it is critical to know how much hot water you use on a regular basis in order to know which tankless hot water heater will work for you. The water capacity or flow rate of a tankless water heater determines the amount of hot water it can provide. The higher the number, the more hot water is produced. An average unit will have a water flow rate of between 5 and 7 GPM. This means that the unit can produce 5 or 7 gallons of hot water per minute. The average shower uses between 2-3 gallons of hot water per minute, with low-flow showers using as little as 1.5 GPM. As a rule of thumb, the average midsize home can run well with either a 5 or a 7 GPM rated unit.

The Energy Efficiency of a Unit

For those looking to save as much money as possible, the energy efficiency of a model is critical. This is measured by a number called the energy factor, or EF. Most units have EF ratings of 83% or higher, with some coming in at around 94%. This means that the unit transfers between 83% and 94% of the energy it uses into heat, wasting as little as 6% energy. Thus, the higher the EF number, the better the energy efficiency. Units that come below 83%, therefore, are not very energy efficient and should be avoided for regular day to day use.

Customer Feedback

Once you know the details of what you need, the next thing to do is hear what customers have to say about the different units. After all, just because the company promises the best results, that doesn’t necessarily mean the unit will deliver. Therefore, one of the best things to do is to browse tankless gas water heater reviews in order to see which models scored the best. Ones that score low are probably not reliable and should be avoided.

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