Best Tankless Water Heater of 2019: Our 5 Favorite Heaters

    Best Tankless Water Heaters


    Are you looking for the best tankless water heater? Tankless water heaters have gained popularity over the years because they deliver hot water nearly instantaneously.

    Why Choose a Tankless?

    With a considerably longer service life than traditional tank style water heaters, the ability to fit into tight spaces, and their environmental appeal, tankless systems are a smart choice for many homeowners.

    Best Tankless Water Heaters for 2019


    We Did the Research for You

    However, finding the right unit to meet your lifestyle and household hot water needs can be a daunting task. We've taken an in-depth look and selected what we feel are the best of the best brands.

    Save Time: Check Out Our Best Tankless Water Heaters NOW


    Stiebel Eltron 24 Plus Tempra, Tankless Water Heater, White
    EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology
    Takagi T-KJr2-IN-LP Indoor Tankless Water Heater
    Rinnai RL Series HE+ Tankless Hot Water Heater: Indoor Installation
    Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater
    Stiebel Eltron Tempra Plus 24
    EcoSmart ECO27
    Takagi T-KJr2
    Rinnai RL 75iN
    Rheem RTGH-95
    Fuel Source
    Electric
    Electric
    Natural Gas
    Natural Gas
    Natural Gas
    Installation Locaation
    Indoor
    Indoor
    Indoor
    Indoor
    Indoor
    Efficiency
    99%
    99.8%
    82%
    82%
    94%
    Maximum GPM*
    5.0
    6.0
    6.6
    7.5
    9.5
    BTU*
    82,000
    92,000
    140,000
    180,000
    199,900
    Warranty
    7 / 3 years
    Lifetime
    15 / 5 years
    12 / 5 years
    12 / 5 years
    Price
    $624.00
    $431.99
    $669.00
    from $901.80
    $1,227.99
    Stiebel Eltron 24 Plus Tempra, Tankless Water Heater, White
    Stiebel Eltron Tempra Plus 24
    Fuel Source
    Electric
    Installation Locaation
    Indoor
    Efficiency
    99%
    Maximum GPM*
    5.0
    BTU*
    82,000
    Warranty
    7 / 3 years
    Price
    $624.00
    EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology
    EcoSmart ECO27
    Fuel Source
    Electric
    Installation Locaation
    Indoor
    Efficiency
    99.8%
    Maximum GPM*
    6.0
    BTU*
    92,000
    Warranty
    Lifetime
    Price
    $431.99
    Takagi T-KJr2-IN-LP Indoor Tankless Water Heater
    Takagi T-KJr2
    Fuel Source
    Natural Gas
    Installation Locaation
    Indoor
    Efficiency
    82%
    Maximum GPM*
    6.6
    BTU*
    140,000
    Warranty
    15 / 5 years
    Price
    $669.00
    Rinnai RL Series HE+ Tankless Hot Water Heater: Indoor Installation
    Rinnai RL 75iN
    Fuel Source
    Natural Gas
    Installation Locaation
    Indoor
    Efficiency
    82%
    Maximum GPM*
    7.5
    BTU*
    180,000
    Warranty
    12 / 5 years
    Price
    from $901.80
    Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater
    Rheem RTGH-95
    Fuel Source
    Natural Gas
    Installation Locaation
    Indoor
    Efficiency
    94%
    Maximum GPM*
    9.5
    BTU*
    199,900
    Warranty
    12 / 5 years
    Price
    $1,227.99

    BTU - British Thermal Unit is the amount of energy needed to cool or heat 1 pound of water by 1 degree Fahrenheit. Its an excellent metric to use for comparison.

    GPM - Gallons per Minute of hot water a tankless can deliver. Also known as the flow rate.


    Tankless Model Guide

    Our Best Tankless Water Heater list covers a wide range of tankless units. Both electric and gas, non-condensing and condensing, and a variety of flow rates to meet many different household hot water needs. Although, each of the reviewed units are indoor models, all of the gas units are available in outdoor models as well. 

    Keep in mind that there isn't a single "best" choice because every situation is different. However, these are our favorites and we're confident that you can find a water heater on the list that will be a good fit for your home and family.

    Best Tankless Water Heaters: Electric

    Best Electric Tankless Water Heaters

    Electric tankless water heaters have many advantages over their gas fueled cousin. Here's a quick list of a few of their strengths and weaknesses. Read our article on Gas vs Electric water heaters for a more comprehensive comparison.

    Pros of an Electric Tankless Water Heater

    • Less expensive than gas units.
    • Easier to install since ventilation is not necessary. This also allows electric units to fit into tight spaces.
    • Extremely energy efficient. Frequently over 90%.
    • Because of the simplistic design, there's less maintenance required and repairs are easier to make.
    • Environmentally friendly.

    Cons of an Electric Tankless Water Heater

    • Electric tankless water heaters have a lower flow rate than gas units.
    • It may be necessary to upgrade your household electrical supply in order to power the unit. Electric heaters require a substantial amount of electricity to heat water.

    Electric Tankless Water Heater Model Specifications Compared

    Stiebel Eltron 24 Plus Tempra, Tankless Water Heater, White
    EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology
    Stiebel Eltron Tempra Plus 24
    EcoSmart ECO 27
    Efficiency
    99%
    99.8%
    Maximum GPM
    5.0
    6.0
    Minimum Flow Activation*
    .50 GPM
    .30 GPM
    Voltage
    240v
    240v
    Wattage
    24 kW
    27 kW
    Amp Draw
    2 x 50 A
    112.5 A
    Minimum Circuit
    2 x 50 A
    3 x 40 DP
    Maximum BTU
    82,000
    92,000
    Stiebel Eltron 24 Plus Tempra, Tankless Water Heater, White
    Stiebel Eltron Tempra Plus 24
    Efficiency
    99%
    Maximum GPM
    5.0
    Minimum Flow Activation*
    .50 GPM
    Voltage
    240v
    Wattage
    24 kW
    Amp Draw
    2 x 50 A
    Minimum Circuit
    2 x 50 A
    Maximum BTU
    82,000
    EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology
    EcoSmart ECO 27
    Efficiency
    99.8%
    Maximum GPM
    6.0
    Minimum Flow Activation*
    .30 GPM
    Voltage
    240v
    Wattage
    27 kW
    Amp Draw
    112.5 A
    Minimum Circuit
    3 x 40 DP
    Maximum BTU
    92,000

    Minimum Flow Activation - The amount of water flowing into the unit to activate or "fire-up" the tankless water heater.

    Our Picks

    Stiebel Eltron Tempra 24 Plus


    At a Glance


    Fuel: Electric

    Efficiency: 99%

    GPM: 5.0

    Weight: 16.1 lbs

    Venting: None Required

    Made in Germany

    Dimensions: 17-1/2"H x 16-5/8"W x 4-5/8"D


    The Stiebel Eltron Tempra 24 is a high-performing, well designed electric tankless water heater with exceptional technology. With a sleek gray finished case and visible controls this unit showcases over 90 years of superior German technology and delivers impressive energy saving performance.

    Features

    • Advanced Flow Control -  With Advanced Flow Control you won't have any cold water surprises when hot water demand is high. When the hot water demand exceeds the unit's ability to deliver, the Advanced Flow Control will kick in and slightly reduce the flow of water. This means that the Tempra Plus will deliver a little less water, but at the temperature you desire. It's so advanced, you won't even notice it's happening!
    • Smart Microprocessor Technology - The incoming and outgoing water temperature is constantly being monitored and adjusted as several temperature and flow sensors continually send readings into a microprocessor. The Tempra 24 Plus is capable of delivering a steady output temperature regardless if there's an increase or decrease in the flow rate.
    • Electronic Temperature Control - Simply adjust the temperature on the Tempra 24 and the tankless unit will always deliver to that temperature.
    • Voltage Input Options - The Tempra 24 Plus is a 240v unit, but it can be installed to run at 208v
    • Self-Modulating Energy Technology - You'll save both money and energy with self-modulation. The heating elements are engaged in stages so the unit will run as efficiently as possible.
    • Safety Features - Built with safety in mind, the unit has a high-limit safety switch to prevent overheating, and a manual reset button to allow you to get it back up and running again without calling a plumber. And, if for any reason the flow of water is interrupted, you won't need to worry about the unit dry-firing.
    • Quiet Operation - Since there's no mechanical switches the Tempra 24 Plus is virtually silent when it's operating. 
    Stiebel Eltron 24 Plus Tempra, Tankless Water Heater, White

    Warranty

    The limited warranty on these tankless water heater units covers 7 years of leakage and 3 years against defects in workmanship and materials. However, installation must be done by a licensed professional. See the complete warranty.

    The limited warranty is the shortest of all the units on our Best Tankless Water Heaters list, which is surprising for such a well designed, quality product. However, the Tempra 24 Plus is loved by those who own it, and the unit should provide 20+ years of service if properly maintained. 

    Value

    With attention to detail, excellent customer service and pride in workmanship Stiebel Eltron is clearly a leader in the industry.

    The Tempra 24 Plus is on the higher side of the price range, especially for an electric tankless water heater. However, since venting will not be necessary, the installation costs should be substantially lower.

    With the trademarked Advanced Flow Control feature and the self modulating technology, the Tempra 24 is among the best of the best, especially if you are looking for a quality unit with years of experience in the industry.

    We wish the warranty was more competitive, but, those who own this unit rave about it's performance, and it's clearly built to deliver impressive results and stand the test of time.

    One look at the Stiebel Eltron Tempra 24 Plus and it's easy to see why it made our tankless water heater list.

    Stiebel Eltron 24 Plus Tempra, Tankless Water Heater, White

    Performance

    The company expects the Tempra 24 Plus to be able to deliver a flow rate of 8.0 GPM if the temperature rise is 20 degrees Fahrenheit. In colder climates, this unit can deliver an impressive 4.0 GPM if the temperature rise is 40F. 

    Rule of Thumb: A typical shower uses 2.0 to 2.5 gallons of water per minute.

    Stiebel Eltron have a wide variety of units in their Tempra Plus line. We like the 24 because we feel it's a strong performing unit that should be able to meet the average household's hot water needs.

    The trademarked Advanced Flow Control feature adds a level of protection during high hot water demand times, and ensures that no one in the house will find themselves in cold water!

    This unit is designed to deliver, but if your household hot water needs exceed the Tempra 24 Plus model, Stiebel Eltron manufacturers more powerful models.

    If you are looking for a whole-house electric tankless water heater this is an excellent choice and should definitely be on your short list!

    Stiebel Eltron Tempra 24 Plus
    Stiebel Eltron 24 Plus Tempra, Tankless Water Heater, White

    EcoSmart ECO 27


    At a Glance


    Fuel: Electric

    Efficiency: 99.8%

    GPM: 6.0

    Weight: 13.75 lbs

    Venting: None Required

    Made in China

    Dimensions: 17"H x 17"W x 3-3/4"D


    The EcoSmart ECO27 has a sleek, no-nonsense design and an impressive lifetime warranty. As a relatively new company, EcoSmart products are rapidly gaining the reputation of delivering solid performance at a budget price.

    Features

    • Self-Modulating Technology - The Eco 27 will adjust the amount of electricity it draws based on how much hot water it needs to heat. By being able to "gear-up" and "gear-down" to the demand of hot water, you'll know that your tankless is drawing the exact amount of energy it needs to get the job done - saving you energy.
    • Precise Control - You're in control with the outgoing water temperature! Increase or decrease the temperature in 1-degree increments.
    • Digital Temperature Display - As the hot water leaves the Eco 27 you'll be able to monitor the exact temperature. This helps make temperature adjustments even easier.
    • Compact -  The slim and compact size of the EcoSmart 27 allows it to fit into the tightest of places. Or, mount it on a wall in a visible location, it's sleek, no-nonsense look means it's all business.
    EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology

    Warranty

    With the only limited lifetime warranty unit that made our list, EcoSmart clearly has confidence in their products. The exchangers, electronics, and heating elements on the ECO27 are all covered under their warranty. 

    However, for the warranty to be valid, the unit must be installed by a licensed plumber/electrician within 30 days of purchase. Read Ecosmart’s Electric Tankless Water Heater warranty guide

    Value

    The ECO27 is a very reasonably priced electric tankless water heater. For the initial price, on-going energy savings due to the self-modulating technology, and the incredible lifetime warranty this unit is hard to beat.

    One note to keep in mind, if you are buying this unit, or any other electric unit, to replace a tank style water heater, be sure your household has adequate electricity. If you need to upgrade your household electrical supply you will undoubtedly add substantially to the initial cost. 

    The positive customer reviews, lifetime warranty and low entry price helped put the EcoSmart ECO27 on our list.

    EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology

    Performance

    EcoSmart is very upfront about the flow rate expectations of their products. The ECO27 should be able to achieve a 2.7 GPM if the incoming water temperature is 37F. However, if the incoming water temperature is 77F, the unit can deliver it's maximum flow rate of 6.6 GPM. 

    The popularity the EcoSmart tankless water heaters ​have seen over recent years could be largely because they provide a solid product that is reasonably priced and environmentally focused. Combined with the lifetime warranty the ECO27 is an excellent choice and well worth a second look! 

    Out of all of the tankless units on our list, this unit delivers the best bang for the dollar!

    EcoSmart ECO 27
    EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology

    Best Tankless Water Heaters: Gas

    Best Gas Tankless Water Heaters

    Gas tankless water heaters are extremely popular because of their ability to deliver high volumes of hot water. Read our article on Gas vs Electric Tankless Water Heaters for a more in-depth comparison.

    Pros of a Gas Tankless Water Heater

    • Increased efficiency over tank-style water heaters.
    • Natural gas is currently less expensive than electricity as an energy source.
    • Capable of delivering a higher flow rate (GPM) than electric tankless water heaters.

    Cons of a Gas Tankless Water Heater

    • More expensive than electric tankless water heaters.
    • Requires expensive venting for non-condensing units.
    • Requires more maintenance than electric tankless water heaters.
    • Emits green-house gases.

    Gas Tankless Water Heater Model Specifications Compared

    Takagi T-KJr2-IN-LP Indoor Tankless Water Heater
    Rinnai RL Series HE+ Tankless Hot Water Heater: Indoor Installation
    Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater
    Takagi T-KJr2
    Rinnai RL 75iN
    Rheem RTGH-95
    Efficiency
    82%
    82%
    94%
    Maximum GPM*
    6.6
    7.5
    9.5
    Minimum Flow Activation
    40 psi
    .40 GPM
    .40 GPM
    Maximum BTU
    140,000
    180,000
    199,900
    Ventalation
    Power Vent
    Concentric
    Direct Vent
    Ignition
    Direct
    Direct Electronic
    Direct
    Electrical
    120 v
    120 v
    120 v
    Venting
    Non-Condensing
    Non-Condensing
    Condensing
    Takagi T-KJr2-IN-LP Indoor Tankless Water Heater
    Takagi T-KJr2
    Efficiency
    82%
    Maximum GPM*
    6.6
    Minimum Flow Activation
    40 psi
    Maximum BTU
    140,000
    Ventalation
    Power Vent
    Ignition
    Direct
    Electrical
    120 v
    Venting
    Non-Condensing
    Rinnai RL Series HE+ Tankless Hot Water Heater: Indoor Installation
    Rinnai RL 75iN
    Efficiency
    82%
    Maximum GPM*
    7.5
    Minimum Flow Activation
    .40 GPM
    Maximum BTU
    180,000
    Ventalation
    Concentric
    Ignition
    Direct Electronic
    Electrical
    120 v
    Venting
    Non-Condensing
    Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater
    Rheem RTGH-95
    Efficiency
    94%
    Maximum GPM*
    9.5
    Minimum Flow Activation
    .40 GPM
    Maximum BTU
    199,900
    Ventalation
    Direct Vent
    Ignition
    Direct
    Electrical
    120 v
    Venting
    Condensing

    Maximum GPM - The best flow rate the tankless water heater is capable of delivering measured in gallons per minute (GPM).


    Our Picks

    Takagi T-KJr2


    At a Glance


    Fuel: Natural Gas

    Efficiency: 82%

    GPM: 6.6

    Weight: 33 lbs

    Venting: Direct / Non-Condensing

    Dimensions: 20-1/4"H x 13-3/4"W x 7-3/4"D


    The Takagi T-KJr2 is a solid performer with plenty of flexibility since Takagi offers this model in both indoor and outdoor options, as well as natural gas and propane fuel options.

    Features

    • Environmentally Friendly -  The Takagi T-KJr2 is a Low NOx model which helps reduce nitrogen oxide emissions.
    • Remote Control - A remote control is included as a standard feature.
    • AFR Sensor - The ARF sensor monitors and maintains the combustion of the unit by adjusting the internal fan motor speed to ensure that the air and fuel is at the correct mixture ration. With this feature to T-KJr2 is able to minimize it's emissions while maximizing it's efficiency.
    • Safety Controls - Loaded with safety features, the unit is equipped with exhaust and water temperature safety controls. It also has a high-limit shut off to prevent overheating, as well as internal freeze protection, and an overheat cut-off fuse to protect the surface of the heat exchanger.

    Warranty

    The Takagi T-KJr2 Tankless Water Heater offers a  generous 15 year limited warranty on the heat exchanger, 5 years on parts, and 1 year labor. To qualify for the warranty work, the unit must be installed by a licensed plumber, gas installer, or contractor. View the Takagi T-KJr2 Tankless Water Heater warranty details on page 55 of the Owners Manual. 

    Value

    With the option of selecting an indoor or outdoor unit, as well as which fuel (propane or natural gas) best fits your location, the homeowner should be able to find a T-KJr2 model that's a good fit. 

    The Takagi T-KJ2 is a non-condensing tankless, which means that expensive stainless steel venting materials will need to be used to properly vent the unit. If you live in warmer climates, you may want to consider purchasing the outdoor model, as installation expenses will be lower since venting isn't necessary.

    Although this is the smallest unit manufactured by Takagi, the T-KJr2 delivers a solid flow of hot water at a reasonable price within reach for the average homeowner. If your hot water needs are high, and you like what Takagi has to offer, the company does have more powerful models available.

    Performance

    With the water output setting at 120F the T-KJr2 is capable of delivering hot water at a flow rate of 4.6 GPM if the incoming water temperature is 70F. If the incoming water drops down to 40F, the unit's flow rate drops to 2.9 GPM.

    The maximum 6.6 GPM flow rate can be achieved when the incoming water temperature is 70F and the hot water temperature setting is 100F.

    The company promotes the T-K-Jr2 as a great fit for "apartments, one bath homes in cold climates, condos and summer cabins." They state that the unit can handle 2 showers in warmer climates and 1 shower in cooler climates, of course.

    The T-KJr2 delivers a solid flow of hot water and has a nice range of features with a focus on safety and performance. This is a good choice if you are looking for a straight-forward, easy to use machine. If your peak hot water demand is relatively low, this gas tankless water heater would likely meet your needs.

    Takagi T-KJr2
    Takagi T-KJr2-IN-LP Indoor Tankless Water Heater

    Rinnai RL 75iN


    At a Glance


    Fuel: Natural Gas

    Efficiency: 82%

    GPM: 7.5

    Weight: 54 lbs

    Venting: Concentric / Non-Condensing

    Made in Japan

    Dimensions: 31"H x 13"W x 17.5"D



    The Rinnai RL 75iN is made for performance. This gas tankless water heater is part of the Rinnai Award Winning Luxury Series which has proudly earned the Energy Star rating. The RL 75iN is an indoor model, however, Rinnai manufactures the exact same unit for outdoor installation (RL 75eN).

    A quick look at what the RL 75iN unit has to offer and you'll see why this gas tankless water heater is part of Rinnai's Luxury Series. It's packed full of standard and optional features and it not only delivers exceptional performance, but it also provides all the bells and whistles to put the homeowner in control.

    Features

    • High Altitude - Do you live in the mountains? No problem, the RL-75iN works in elevations up to 10,200 feet.
    • Venting Options - Whether you need to vent the RL75-iN through a wall or the roof it won't be a problem. You can run your venting vertically or horizontally.
    • Scale Detection - When the unit needs to be flushed due to scale build-up you'll receive an alert from the RL-75iN.
    • Wi-fi Enabled - The RL-75iN is wi-fi enabled which allows you to tap into features that makes it truly one of the smartest tankless units on the market today.
    • Control-R - Add the optional Control-R to your tankless and you'll be able to adjust and monitor your water heater's every move. Receive alerts, change the temperature, and even troubleshoot a problem all from your smartphone.
    • Remote Monitoring - Even your plumber can monitor your tankless with Control-R. He'll receive automatic maintenance alerts and know exactly where to start troubleshooting before he even opens the panel.
    • Lots of Extras -  There's a temperature lock, plenty of safety features, and even isolation valves to simply maintenance. 
    Rinnai RL Series HE+ Tankless Hot Water Heater: Indoor Installation

    Warranty

    The Rinnai RL 75in Natural Gas Tankless water heater comes with a limited warranty that requires the unit to be installed by a licensed professional who has attended Rinnai Installation Training Classes.

    The heat exchanger is covered for 12-years. Other parts and components for 5-years, and Rinnai will cover 1-year of reasonable labor. Find out about Rinnai’s tankless water heater complete warranty. 

    Value

    This gas tankless water heater isn't for everyone. To start with, many homeowners may not need the amount of hot water this unit can deliver, and if the nifty wi-fi remote monitoring and smart phone temperature adjustments don't appeal to you, there really isn't a reason to purchase a wi-fi enabled tankless. 

    With that said, we think this is a fantastic unit manufactured by a company that's been around for many years. Rinnai stands behind their products with a solid warranty and they are constantly moving their product line to meet the consumer demand for performance, features and technology.

    The RL 75in will provide years of service if properly maintained and it is an excellent choice for large homes. In addition, it is also certified for manufactured (mobile) homes.

    As you might imagine, this is a higher priced tankless water heater. But if your peak hot water needs are high, and the wi-fi technology appeals to you, you really can't go wrong buying  this Rinnai unit.

    Rinnai RL Series HE+ Tankless Hot Water Heater: Indoor Installation

    Performance

    Rinnai promotes the RL 75iN model of being capable of delivering enough hot water to support 3 showers and 1 faucet based on a ground temperature of 70F. 

    The unit can achieve the maximum flow rate of 7.5 GPM​ when the temperature rise is 40F. However, even when the incoming water needs to be heated by 75F, the unit can deliver an impressive 4.0 GPM flow rate!

    This may be a high priced gas tankless water heater​, but it is also loaded with features and upgrades, and it's capable of delivering a seemingly endless supply of hot water. If you're looking for a high-demand gas tankless, this is an excellent pick.

    Rinnai RL 75iN
    Rinnai RL Series HE+ Tankless Hot Water Heater: Indoor Installation

    Rheem RTGH-95


    At a Glance


    Fuel: Natural Gas

    Efficiency: 94%

    GPM: 9.5

    Weight: 79 lbs

    Venting: Direct Vent / Condensing

    Made in Japan

    Dimensions: 18.5" x 9.8" x 27.5"


    Rheem's RTGH-95 is the only condensing tankless water heater that made our list. This powerhouse of a tankless is loaded with safety features and it's designed to not only look good, but to deliver hot water as efficiently as possible. 

    Features

    • Water Savings Setting - This feature allows the homeowner the option of decreasing the flow of water through the pipes until the water reaches the set temperature. This can save up to 1,100-gallons of water each year.
    • Hot-Start Programming - Minimizes the "cold water sandwich" which can sometimes occur during periods of frequent on/off operation.
    • High Altitude - Capable of operating at altitudes up to 8,400 ft.
    • Freeze Protection - Designed to protect itself from freezing in temperatures of -30F.
    • Low Flow Fixture Compatible - Industry first minimum flow rate of .26 GPM and minimum activation flow rate of .40 GPM ensures the user will receive hot water even in low demand situations.
    • Maintenance Alerts - Warning codes will flash and alert the homeowner when service is necessary.

    Warranty

    Rheem backs their RTGH-95 model with an impressive 12-year warranty on the heat exchanger and 5-years on parts and labor. View the terms of the Rheem water heater warranty.

    Although Rheem doesn't invalidate the warranty coverage if the tankless water heater isn't installed professionally, they do strongly recommend that it is "installed by a contractor that is licensed, state qualified and trained on Rheem's tankless products." In other words, the warranty will be void if the unit isn't properly installed.

    Value

    The Rheem RTGH-95 is a powerful tankless water heater. It is also the highest priced unit to make our list. 

    Since this is a condensing unit and expensive stainless steel venting materials are not needed, installation costs should be lower, which will help offset the initial purchase price.

    Overall, we think the Rheem RTGH-95 provides excellent value for large homes with high hot water needs. It's capable of delivering large quantities of hot water in an incredibly efficient manner. If properly maintained it should last 20+ years.

    Performance

    The RTGH-95 unit is the most powerful in Rheem's Prestige line and the company states that it should be able to deliver enough hot water to service 3 bathrooms with a temperature range between 85 - 140F. 

    Recommended Maximum Temperature: The Department of Energy recommends a maximum temperature of 120F.

    With a 35F temperature rise the RTGH-95 can achieve a maximum flow rate of 9.5 GPM. Even if this unit needs to perform a 100F temperature rise, it can still deliver a flow rate of 3.8 GPM! This is very impressive and is a clear display of just how powerful this unit is.

    There's no need to worry about running a dishwasher or a washing machine when household members are showering . . . this tankless was designed to deliver! 

    The Rheem RTGH-95 may not have all the tech bells and whistles of the Rinnai, but if you're looking for high water flow and excellent efficiency from a gas tankless water heater, this unit is superb! It's designed to deliver high volumes of hot water without interruption, and it is a great fit for large homes with multiple bathrooms.

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

    Best Tankless Water Heater

    As we stated in the beginning of our review, when selecting a tankless water heater there are many variables, therefore, there is not a one-size-fits-all. Our Tankless Water Heater List features a wide range of units that fit many different needs and situations. 

    Other Tankless Resources

    Here are some helpful posts that will help you to make an informed buying decision:

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    Last update on 2019-08-16 / Affiliate links / Images from Amazon Product Advertising API