Best Whole house tankless gas water heater in 2022 – Reviews & Buyer Guide

Every home needs a heating appliance, among which water heaters are the most popular and contribute to a large part of the home utility bills. They are loved by a large number of consumers as most showers are taken in the morning or in the night time which are colder periods of the day. Hence you need water heaters to enjoy comfortable showers. However, it doesn’t mean that people will spend so much money so that they can just get a hot shower. A water heater also needs to have additional features. These features can be found in a whole house tankless water heater.

A Whole House Gas Tankless Water Heater is a type of water heater that provides hot water to an entire house. It can be used in homes with multiple bathrooms and at least two showers, so it is not ideal for single-person households, but best suited for larger families or those who take long showers. A whole-house tankless gas water heater uses natural gas or propane combustion as a heat source. Where natural gas is the cheapest fuel source that powers a tankless water heater. There are also some disadvantages to this type of system. However, if you want hot water all over your house with less waiting time than that of a tanked water heater, then consider a gas whole house tankless water heater as your top choice.

The Best Whole house tankless water heaters have a lot to offer. You can enjoy hot water anywhere in your household with limited waiting and no running out of hot water. There is no need for installing several tanks either; you only need a single unit that works efficiently and delivers the desired results. These units are also so energy efficient that you can see your water heater energy bill reducing by more than 40% within the first month. Based on these qualities it can be seen that they are not very expensive.

You can go for a propane or natural gas model, depending on your needs, but the price will always be higher compared to tanked water heaters. The Best Whole House tankless water heaters can be installed anywhere in your home, including the basement or attic depending on the layout of your house and where electricity supplies are easily available.

Quick Shopping Tips for Best Whole house tankless gas water heater

Don’t you like to scroll a vast selection of tankless heaters? Check our quick picks below and have wonderful shopping within less time.

Budget Pick

Takagi T-KJr2 is an inexpensive tankless unit that gives around 7 GPM of hot water and is sufficiently powerful to act as a whole-house tankless water heater for small and medium-sized families. It got a lot of safety mechanisms to deal with various types of climates without running into some problem.

Best pick

Rinnai RUR199IN is the best tankless water heater. It has a huge hot water capacity and supports a wide range of temperature making it. Making it the optimum tankless water heater for a large family’s needs. It also incorporates several advanced features that are not found in another tankless water heater like recirculation capability. While wifi controls give easy adjustment with moving a long distance.

Staff pick

Takagi T-H3DVNG gives the best value to your investment. Its 10 GPM capacity can easily meet the need of a large family. it is an extremely energy-efficient water heater due to its condensing nature. It also comes with many advanced features and various safety mechanisms to ensure a good ROI. While its superior warranty act as support that you can always rely on in times of need.

At a Glance:

Top 7 whole house tankless water heater

The best whole house tankless water heater offers convenience and affordability. There is no need to ration the hot water supply because everyone in your household will get their turn at a comfortable temperature. These units also use very energy-efficient technology, thus making them cheaper over time. They also have an average lifespan of 15 years or more, which means you can go for these even if you intend to stay in the house for a long time.

The tankless water heater is better because it keeps the hot water running at all times without interruption. As soon as you turn on a faucet or open a shower nozzle, hot water immediately flows out. It’s incredibly convenient and saves money in the long run. The downside is that they’re more expensive to buy in the first place and to install. However, one benefit is that they use fewer resources in order to heat up your home’s water supply. Which ends up reducing your energy bills especially in the case of whole house gas tankless water heater as natural gas is the cheapest fuel for a tankless water heater and gives the highest energy savings. Similarly, the gas tankless water heater is certified by energy star and makes you eligible for rebates up to $300.

Not all whole house tankless water may be worthwhile for you. That’s why we have shortlisted a number of tankless water heaters and made a list of the top 7 whole house tankless gas water heaters. We made this list with the hope that they can help you make a more informed decision.

AwardDesignTankless heater reviewsRetailer
Best condensing whole house tankless water heater
1. Noritz NRC66-DV-NG Condensing tankless water heater
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Best whole house tankless water heater natural gas
2. Rinnai RL94EN tankless water heater
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Best whole house tankless water heater indoor
Budget Pick3. Takagi T-KJr2 tankless water heater
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Best whole house tankless hot water heater
Best Pick4. Rinnai RUR199i-N tankless water heater
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Best gas whole house tankless water heater
5. Rheem RTGH-95DVLN tankless water heater
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Best buy whole house tankless water heater
Staff Pick6. Takagi T-H3DVN tankless water heater
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Best whole house tankless water heater outdoor
7. Rinnai RU160EN tankless water heater
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1. Noritz NRC66-DV-NG Condensing tankless water heater

Best condensing whole house tankless water heater

Noritz NRC66DVNG Condensing Tankless Hot Water Heater
Noritz NRC66DVNG Condensing Tankless Hot Water Heater

Noritz NRC66-DV-NG is known as one of the best tankless water heaters available to buy today. This product has a durable heat exchanger, freezing protection, overheating, surge protection, and low NOx emission which makes this product worth buying.

Noritz NRC66-DV-NG Condensing tankless water heater has a competitive edge over all other products available in the market thanks to its superior technology, unique features, and affordable rates. Novitz NRC66 is designed to give 6.6 GPM of hot water capacity while an energy factor of 0.97 makes it the most energy-efficient gas tankless water heater.

FEATURES:

1. Durable Heat Exchanger

Novitz nrc66-DV-ng condensing tankless water heater has a durable heat exchanger made of stainless steel.

2. Freezing protection

Noritz NRC66-DV-NG Condensing Tankless Water Heater comes with freeze protection to make sure it can still work even under extremely low temperatures (down to -40 degrees Celsius). The freeze protection will activate the healing process if the airflow becomes so cold that it may freeze. It is followed by water going out of the unit to protect the inner parts of the tankless water heater from being frozen.

3. Overheating and Surge protection

The NRC66-DV-NG is equipped with a self-diagnostic system that alerts the user when the appliance needs to be serviced. In addition, an airflow sensor detects whether or not air is being drawn into the heat exchanger. If airflow becomes restricted, there could be a hazardous rise in outer surface temperature.

4. Low NOx

The NRC66-DV-NG is equipped with a self-diagnostic system that alerts the user when the appliance needs to be serviced. In addition, an airflow sensor detects whether or not air is being drawn into the heat exchanger. If airflow becomes restricted, there could be a hazardous rise in outer surface temperature.

5. Temperature rise and flow rate

Temperature Rise 30° F 45° F 60° F 70° F 80° F

Flow rate 6.6 GPM 5.3 GPM 3.8 GPM 3.3 GPM 2.9 GPM

Warranty

Heat Exchanger is warranty covered with 12 years, Parts covered by 5 years and lastly, labor is covered by 1 year.

Certifications

Certified by American National Standard (ANSI) and Canadian Standard (CSA), Certified by Energy Star, certified by NSF, Low NOx certified by SCAQMD,

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Activation flow rate @ 0.5 GPM
  • Normal water pressure is 30-150 psi
  • Voltage demand is 120V
  • power demand is 56 Watts
  • Water and connection compatible with ¾ in. NPT
  • Condensate Drain needs to be fitted with ½ in. NPT
  • Venting Requires 3 in. schedule 40 PVC
  • Minimum/Maximum BTUs demand is 15,000/120,000 BTU

Specifications

  • Color: Beige
  • Weight: 39 pounds
  • Dimension: 23.6 in. height, 13.8 in. width, and 6.7 in. depth

Pros

  • Condensing tankless water heater
  • The energy efficiency of 91%
  • Energy Star
  • Low NOx

Cons

  • Not for big families with colder climates

Why you should buy this?

There are many reasons why you should buy this tankless water heater. For one, it is affordably priced. It has good energy efficiency and provides more hot water at a low cost.


2. Rinnai RL94EN tankless water heater

Best whole house tankless water heater natural gas

Rinnai RL94eN Tankless Hot Water Heater
Rinnai RL94eN Tankless Hot Water Heater

Rinnai RL94en tankless water heater is a highly advanced unit among non-condensing tankless water heaters. It can save up to 40% more energy than the traditional storage tank type and its efficiency of 83% is the highest in the industry. This unit has Wi-Fi remote control and a recirculation pump can be installed with this unit. This outdoor unit comes with a space-saver design and it’s ideal for those who need an outdoor unit that does not take up much room. Its high flow rate of 9 GPM is sufficient to support 3-5 showers at the same time in warmer climates. While it can still support 2-3 showers at the same time in colder climates. Just like other tankless water heaters, RL94EN output also depends on the incoming water temperature.

FEATURES:

1. Overheating, freezing, and surge protection

Overheating, freezing, and surge protection is the ability of the heater to shut off if it senses that the heater has overheated the water or detects that there is a power surge. This is a great addition to the tankless water heater as it gives more security to its operation. This unit also comes with frost protection hence this unit can also come up with colder climates without any worry of a tankless water heater facing any danger.

2. Circ logic technology:

Circ logic, also known as cyclical logic is the ability of the water heater to locate the pattern and frequency of different fixtures and decide on a circulation path that gives the best results. This technology works great with a recirculation pump but sadly, this unit doesn’t come with the recirculation pump. You have to purchase the pump separately.

3. Ultra-low NOx

Ultra-low NOx is the lowest amount of nitrogen oxide produced by an appliance. It is a very important feature to have because it means the heater won’t be producing a lot of nitrogen oxide. Which is linked to potential respiratory problems if inhaled in high concentrations.

4. Wi-Fi controllable

Rinnai RL94eN is a Wi-Fi controllable water heater. The heater can be turned on and off from anywhere through an app installed on your smartphone so you don’t have to keep getting up from the couch or bed to turn it on or off.

Warranty:

Heat Exchanger: 12-years

Parts: 5-years

Labor: 1-year

Certified:

SCAQMD Certified, AHRI certified, ANSI certified, CSA Certified.

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Activation flow rate is 0.5 GPM
  • Water pressure compatibility with 30-150 psi
  • Voltage demand is 120V
  • Power demand is 56 Watts
  • Water and gas connection support ¾ in. NPT
  • Condensate Drain needs to be fitted with ½ in. NPT
  • Venting Requires 3 in. schedule 40 PVC
  • Minimum/Maximum BTUs demand is 15,000/120,000 BTU

Specifications

  • Color: white
  • Weight: 39 pounds
  • Dimension: 23.6 in. height, 13.8 in. width, and 6.7 in. depth

Pros

  • Wifi capable
  • Support external recirculation pump
  • Frost, overheating, and surge protection
  • The outdoor unit doesn’t require a vent

Cons

  • Expensive

Why you should buy this?

It is a highly advanced non-condensing tankless water heater that can save up to 40% more energy than traditional storage tank types. Its efficiency is the highest in the industry at 83%. This unit has Wi-Fi remote control and a recirculation pump can be installed with this unit. all this make it an optimum mean of a luxurious experience.


3. Takagi T-KJr2 tankless water heater

Budget Pick

Best whole house tankless water heater indoor

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

Takagi T-KJr2 is a tankless water heater that uses natural gas or propane to heat water. When you have no hot water in your home, the Takagi T-KJr2 is designed to save you time and energy by supplying an endless supply of hot water. This small unit measures 18″H x 11.5″W x 8.75″ D and weighs 50 pounds, making it suitable for any household or office space. It is designed to supply an endless supply of hot water and fits in small spaces without sacrificing features or efficiency.

This tankless water heater comes with a remote control that makes operation easier and gives you more control than manually adjusting the unit. The controller is designed to monitor the temperature and function of the Takagi T-KJr2 for years of dependable use.

The Takagi T-KJr2 has four different features that make it safe, efficient, and convenient for any household or office space.

FEATURES:

1. Troubleshooting Error Codes

This feature troubleshoots errors that may occur with the Takagi T-KJr2. This tankless water heater comes with an Error Code feature designed to tell you what the problem is and how to fix it. The Error Code panel alerts you when the Takagi T-KJr2 has a gas leak, insufficient ventilation, and high pressure or flow problems. If you are not familiar with how to troubleshoot errors, call your installer or customer service number listed in your instruction manual.

2. Modulation Technology

Allows it to monitor and regulate the amount of water flowing through the Takagi T-KJr2 for a consistent hot water supply. This way it saves energy by heating the water as it flows through it making it one of the more efficient units.

3. Freezing, Overheating, and Surge Protection

Takagi T-KJr2 has anti-freezing measures to protect against freezing temperatures that can cause damage to the unit. While it overheating protection ensures that the water temperature doesn’t reach a potentially harmful or scalding level. Lastly, its surge protection protects the unit against irregular electrical current spikes that may damage the tankless unit.

4. Low NOx

Takagi T-KJr2 uses fewer NOx emissions than conventional tankless water heaters since it heats water as it passes through the unit, instead of heating stored water like traditional tanks.

5. GPM and Temperature rise

Temperature Rise 35°F 50°F 60°F 80°F 100°F

Flow rate 6.6 GPM 4.7 GPM 3.7 GPM 3 GPM 2.5 GPM

Warranty

Heat Exchanger: 10 years

Parts: 5 years

Certified

UL certified, Energy Star Certified

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Activation flow rate is 0.50 GPM
  • Water pressure needs to be 30-150 psi
  • stainless-steel direct venting (4 inches)
  • Minimum/Maximum BTU required for this unit is 19500/140000 BTU
  • The voltage needed is 120V
  • Water and gas connections are compatible with ¾ in. NPT

Specifications

  • Color: white
  • Weight: 38 pounds
  • Dimension: 20.3 inches in height, 13.8 inches in width, and 6.7 in depth

Pros

  • Overheating, freeze and surge protection
  • Low NOx
  • Energy Star Certified
  • Troubleshooting Error codes help in problem diagnosis
  • Superior warranty

Cons

  • The energy efficiency of 82%

Why you should buy this?

Takagi T-KJr2 is an efficient tankless water heater with unique features that enable it to save energy and time. The other features such as Troubleshooting Error Codes, Modulation Technology, and Low NOx help in conserving resources while maximizing the efficiency of the unit. all these features make it a convenient water heater for use.


4. Rinnai RUR199i-N tankless water heater

Best Pick

Best whole house tankless hot water heater

Rinnai RU199iN RRU199iN, RU199in-Natural Gas/11 GPM
Rinnai RU199iN RRU199iN, RU199in-Natural Gas/11 GPM

The Rinnai rur199i-N is a condensing tankless water heater. It has become one of the most popular models on the market today. It is often termed as a best value condensing unit. It is also known as the best overall tankless whole house tankless water heater as it covers all the areas of your needs perfectly.

This water heater has five key features including Error Codes, Quiet Operations, ThermaCirc360 Recirculation, Ultra-Low NOx, and Modulation Technology. These various features have made the rur199i-N one of the most popular tankless water heaters on the market today.

FEATURES:

1. Error Codes

The Error Codes are very beneficial when it comes to maintenance. The error codes will let the user know when there is a problem with the unit, and then they can correct any problems because of this. This helps to prevent issues down the road.

2. Quiet Working

Another feature is quiet operation. Because of its 9 decibels lower than other models, it is much quieter than other models. It also has a built-in sound blanket to keep the noise down even more.

3. ThermaCirc360 Recirculation

Next, the ThermaCirc360 Recirculation is designed to reduce standby heat loss by up to 40 percent over traditional tankless water heaters. This water heater has Rinnai’s patented ThermaCirc valve which constantly circulates pre-heated water around the home. This reduces the time it takes for hot water to reach the faucet. Hence you get instant hot water as soon as you open the fixture. This way Rinnai rur199in eliminates one of the biggest drawbacks of a whole house tankless water heater. Which is that it takes more time to provide hot water to the furthest fixture. With thermacirc360 recirculation you can get hot water at the first instant regardless of the distance of the fixture from the tankless unit.

4. Ultra-Low NOx

The Rur199i-N also uses Ultra-Low NOx technology. This technology helps the unit to run cleaner and helps prevent carbon monoxide and other harmful gases. This way it reduces the carbon footprint that a tankless water heater releases while operating.

5. Modulation Technology:

Finally, this water heater has Modulation Technology. This means that this particular model is capable of maintaining an endless supply of hot water and that it can adjust its temperature to meet the demand. This technology helps to reduce energy consumption by up to 40 percent over traditional tankless water heaters.

6.     Temperature rise and Flow rate:

Temperature Rise 40°F 55° F 70° F 85° F 100° F

Flow rate 9.8 GPM 7.0 GPM 5.5 GPM 4.5 GPM 3.8 GPM

Warranty

Heat Exchanger: 12 years

Parts/components: 5 years

Labor: 1 year

Certified

Certified by AHRI, CSA. It is also certified by Energy Star.

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • The minimum activation flow rate is 0.4 GPM
  • The water pressure recommended is 50-150 psi
  • The voltage need is 120V
  • Wattage demands are 84 watts
  • Water and gas connections operate with ¾ in. NPT
  • Condensate Drain support ½ NPT
  • Venting Requires 2 in. nominal PVC or 3 in./5 in. concentric venting
  • Minimum/Maximum BTU requires 15,000/199,000 BTU

Specifications

  • Color: Silver Metallic
  • Weight: 64 pounds
  • Dimension: 31.3 in. height, 18.5 in. width, and 11.5 in. depth

Pros

  • Thermocirc360 recirculation
  • Wifi capable
  • The energy efficiency of 95%
  • Eco-Friendly
  • Energy Star Certified

Cons

  • Expensive

Why you should buy this?

This is an excellent product that you should definitely buy if money isn’t a factor. It is energy-saving, Eco-Friendly, and Energy Star Certified. similarly, it also got tons of advanced features which are not found in The warranty of the unit makes it even better, 12 years on the Heat Exchanger, 5 years on parts/components, and 1 year on labor! This way, you know that your new product is going to last.


5. Rheem RTGH-95DVLN tankless water heater

Best gas whole house tankless water heater

Rheem RTGH-95DVLN Tankless Natural Gas Water Heater
Rheem RTGH-95DVLN Tankless Natural Gas Water Heater

Rheem RTGH-95DVLN is an indoor unit that can modulate its speed in order to maintain optimal comfort while minimizing energy consumption. It comes with a number of different features that make it an ideal choice for your home as it provides safety, luxury, and higher energy efficiency.

FEATURES:

1. Built-in Condensate neutralizer

As it comes with a built-in condensate neutralizer you don’t need to install a new one. A condensate neutralizer neutralizes the acidic and corrosive nature of the exhaust fumes that can damage the drainpipes if not neutralized.

2. Overheating protection

This feature ensures the unit’s safety and prevents it from getting damaged when used in areas with high temperatures or in case water temperature rises above a certain temperature.

3. Self-diagnostic system

The self-diagnostic system helps the homeowners get information about any error that might have occurred due to which the unit is not working properly.

4. Recirculation pump kit-Ready

One can easily install a recirculation pump with this tankless water heater. No additional settings must be done, all you need to do is buy a recirculation pump and connect it with the tankless unit by following a few simple steps.

5. Ultra-low NOx (nitrogen oxide)

This provides a healthy home environment by preventing the emission of nitrogen oxide which otherwise increases respiratory ailments.

6. Temperature rise and flow rate:

Temperature Rise 35° F 45° F 60° F 80° F 100° F

Flow rate 9.5 GPM 8.5 GPM 6.4 GPM 4.8 GPM 3.8 GPM

Warranty

Heat Exchanger: 15-years

All Parts: 5 years

Labor: 1 year

Certifications

UPS, AHRI, and Energy Star Certified

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • The minimum activation flow rate is 0.4 GPM
  • Water pressure compatible with 30-150 psi
  • Voltage demand is 120V
  • Gas and Water connection support ¾ in. NPT
  • Condensate Drain support ½ in. NPT
  • Venting Requires 2 in. /3 in. PVC schedule 40 direct vent
  • Minimum/Maximum BTU required are 11000/199,900 BTU

Specifications

  • Color: Metal Grey
  • Weight: 82 pounds
  • Dimension: 27-½ in. height, 18-½ in. width, and 9-¾ in. depth

Pros

  • High hot water output
  • Condensing tankless water heater
  • Supports external recirculation pumps
  • Wifi connectivity
  • Built-in Condensate neutralizer

Cons

  • Doesn’t come with its own recirculation pump

Why you should buy this?

If you are looking for an efficient tankless water heater that is best in its class, then Rheem RTGH-95DVLN is a perfect choice. This unit provides optimal performance and is energy efficient. It also supports wireless connectivity so you can control the device with your smartphone via the Rheem app.


6. Takagi T-H3DVN tankless water heater

Staff Pick

Best buy whole house tankless water heater

Takagi T-H3-DV-N Condensing Tankless Water Heater
Takagi T-H3-DV-N Condensing Tankless Water Heater

The Takagi T-H3DVN is one of the most energy-efficient condensing tankless water heaters on the market today. It has the best combination of price and value. Takagi T-H3DVN condensing tankless water heater is a high-performance device. The low NOx emissions make for a very low pollution factor. Using modulating technology, the Takagi T-H3DVN is able to adjust its output as needed for maximum efficiency.

Dual copper and stainless steel heat exchangers stand up well against time and ensure efficient heating over a long lifespan. Easy installation with simple blue-light troubleshooting diagnostic codes makes this unit easy to use for even those without previous experience of using a tankless water heater. Despite its smaller size, the Takagi condensing tankless water heater produces a surprisingly large flow rate which ensures that you will always have enough hot water for your needs.

FEATURES:

1. Ultra-low emission:

The T-H3DVN has ultra-low NOx emissions ensuring that you are not inhaling dangerous levels of nitrogen oxide into your lungs.

2. Modulation Technology:

This unit is used Modulation technology, which adjusts the amount of heat supplied to your home’s various water needs or demands. As a result, it saves energy and does not lose any heat.

3. Dual Copper and Heat Exchangers:

Each heat exchanger in this condensing tankless water heater is made of durable copper and stainless steel parts that can easily withstand the might of time for a longer period.

4. Anti-Frost and Overheating protection:

This unit has freeze protection, meaning that the T-H3DVN automatically turns on if it detects temperature drops below 40° F (4° C) creating warm air that prevents freezing up. It also comes with overheating protection, secured by an automatic shut-off sensor that monitors internal temperatures at all times. This sensor shuts off the unit as the water in tankless exceeds a certain temperature.

5. Troubleshooting Diagnostic Codes:

The Takagi T-H3DVN is easy to install and use without previous experience in using this type of device. Because it uses simple blue light diagnostic codes which act as troubleshooting indicators for any problem your tankless water heater may face.

6. Temperature rise and flow rate

Temperature Rise 35° F 50° F 65° F 80° F 100° F

Flow rate 10 GPM 7.5 GPM 5.8 GPM 4.8 GPM 3.8 GPM

Warranty

Heat exchanger: 15-years

All parts: 5-years

Certified

Energy Star Certified, AHRI, and CSA certified.

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Minimum flow rate is 0.40 GPM
  • Water pressure supported between 15-150 psi
  • Voltage demand is 120V
  • Water and Gas connection support ¾ in. NPT
  • Condensate Drain compatible with ½ in. NPT
  • Venting Requires 3-4 in. diameter Schedule 40 PVC

Specifications

  • Color: white
  • Weight: 71 pounds
  • Dimension: 24.88 inches in height, 17.75 inches in width, and 11.25 in-depth

Pros

  • Freezing, overheating and surge protection
  • Energy efficiency of 94%
  • Pleasing design
  • Error codes
  • Durable heat exchangers

Cons

  • Need condensate neutralizer and a condensate drain.

Why you should buy this?

Takagi T-H3DVN tankless water heater is one of the best indoor water heaters. It is energy-efficient, safe for usage, and has an attractive design. The price set by Takagi makes it very affordable whilst providing top quality.


7. Rinnai RU160EN tankless water heater

Best whole house tankless water heater outdoor

Rinnai RU160EN tankless water heater
Rinnai RU160EN tankless water heater

Rinnai RU160EN tankless water heater is a powerful condensing tankless water heater. This model is an outdoor unit and has a space-saver design. As a condensing tankless water heater, it has high efficiency with an energy efficiency of 93%. Rinnai RU160EN comes with a 9 GPM of hot water capacity that is sufficient to support all your needs in both warmer and colder climates. This Whole house tankless water heater is also equipped with Wi-Fi remote control, and a recirculation pump can be installed with this unit.

FEATURES:

1. Modulation technology

Modulation technology is a unique feature in Rinnai RU160EN. It has the ability to control the flow of hot water by either increasing or decreasing the amount of energy being supplied to the unit. This not only saves money but also ensures that you are never caught short with an inadequate supply of heat.

2. Recirculation ready (need to purchase the pump separately)

The Rinnai Ru160en comes with smart technology that can assist a recirculation pump in deciding on the best course of water circulation. However, you need to purchase the recirculation pump separately as it doesn’t come with the tankless unit.

3. Wi-Fi control

Rinnai ru160en has the ability to connect to your home/office Wi-Fi network using its mobile app. you don’t have to go to your tankless water heater whenever you want to change settings. You can remotely adjust it according to your needs.

4. Durable part composition

To ensure that it is as reliable as possible the Modulation technology is a unique feature in Rinnai RU160EN. It has the ability to control the flow of hot water by either increasing or decreasing the amount of energy being supplied to the unit. This not only saves money but also ensures that you are never caught short with an inadequate supply of heat. the tankless water heater is constructed from high-quality stainless steel which is both corrosion resistant and highly durable giving it a lifespan of over 20 years.

5. Temperature rise and flow rate

Temperature Rise 40° F 55° F 70° F 90° F 120° F

Flow rate 8 GPM 5.6 GPM 4.5 GPM 3.3 GPM 2.7 GPM

Warranty

Heat exchanger: 15 years or 12000 operating hours.

All Part: 5 years

Labor: 1 year

Certifications

Complies with SCAQMD guidelines. Energy star, AHRI, ANSI, CSA certified.

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • The minimum activation flow rate is 0.4 GPM
  • The water pressure recommended is 50-150 psi
  • Voltage demand is 120V
  • Wattage demand is 47 W
  • Water and Gas connection: ¾ in. NPT
  • Gas connection: ¾ in. NPT
  • Condensate Drain supports ½ in. NPT
  • Venting Requires twin schedule 40 PVC or Concentric venting
  • Minimum/Maximum BTU required are 15,000/160,000

Specifications

  • Color: Metallic silver
  • Weight: 62 lbs.
  • Dimension: 26.4 in. height, 18.5 in. width, and 11.4 in. depth

Pros

  • Wifi control
  • Recirculation Capable
  • Outdoor unit hence don’t need a vent
  • Superior warranty
  • Great flow rate and temperature rise

Cons

  • Expensive

Why you should buy this?

Rinnai RU160EN is a condensing tankless water heater with a 9 GPM flow rate. It has a space-saver design and an energy-efficient of 93%. In addition, this unit can enable you to control it from anywhere as its equipped with a Wi-Fi connection. However, the only downside is that Rinnai RU160EN is quite expensive.


BUYER GUIDE: Best Whole House Tankless Water Heater

Fuel type (natural gas or propane)

The first thing to check for in a whole house gas tankless water heater is to check the fuel source needed to power the unit. As fuel has a great impact on the cost of the tankless water heater. Regardless of whichever fuel you decide on, both have their own pros and cons. if you have decided on natural gas tankless water heater you need to know that installation of the units costs a lot, however. The operating cost of natural gas tankless water heater is the least and gives the highest savings. While propane fuel tankless water heater is cheaper to install but much more expensive to operate, hence gives smaller energy savings.

Flow rate

All whole house tankless water heaters come with a high flow rate especially is the case with gas-powered tankless water heaters. These high flow rates are capable enough to support multiple fixture use at the same time. However, like other tankless water heaters, the whole house tankless water heater also comes with different flow rates. With smaller units having a flow rate of 6 GPM to the bigger units having a flow rate of 11 GPM.

In Addition, these flow rates are subject to change based on the incoming water temperature. A 6 GPM whole house tankless water heater that works fine in the warmer climate of southern states may not support the whole house in colder climates of northern states.

So in order to get a clear picture of whether a tankless water heater is suitable to meet your needs depends on three things: tankless water heater capacity, the temperature of the incoming water, and your hot water need in peak hours.

Venting

Gas whole house tankless water heaters require proper venting to exhaust the harmful exhaust gases to the outside environment instead of releasing them in your living space.

Both the combustion of natural gas and propane result in the formation of by-products that need to be exhausted outside. That’s why if your whole house tankless water heater is an indoor unit then you need to install a vent to exhaust the harmful gases outside.

As a conclusion to this buyer guide, it is evident that the best whole house tankless gas water heater is based on your personal needs and location. So if you are living in a colder climate then make sure you check whether the tankless water heater you are about to buy is capable of generating enough hot water between peak hours or not. Also depending on the temperature of your incoming water, you may need to buy a higher flow rate unit than what you may actually require. If you live in a warmer climate then go for a smaller capacity and lower price whole house tankless gas water heater that fits your budget.

AwardDesignTankless heater reviewsRetailer
Best condensing whole house tankless water heater
1. Noritz NRC66-DV-NG Condensing tankless water heater
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Best whole house tankless water heater natural gas
2. Rinnai RL94EN tankless water heater
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Best whole house tankless water heater indoor
Budget Pick3. Takagi T-KJr2 tankless water heater
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Best whole house tankless hot water heater
Best Pick4. Rinnai RUR199i-N tankless water heater
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Best gas whole house tankless water heater
5. Rheem RTGH-95DVLN tankless water heater
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Best buy whole house tankless water heater
Staff Pick6. Takagi T-H3DVN tankless water heater
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Best whole house tankless water heater outdoor
7. Rinnai RU160EN tankless water heater
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Recommendation:

Are you looking for a tankless water heater that fits your budget but can meet your extensive hot water needs? All while making sure that it doesn’t break the bank. Then it’s time for you to buy Takagi T-H3-DVNG Condensing Tankless Water Heater. It has all these qualities and many more. With Energy Star qualified, it is the best tankless gas water heater that you can get in the current market.


Conclusion:

At the end of the day, a whole house tankless water heater is a great way to cut your energy bill. A best Whole house tankless gas water heater gives you 40% of your water heater bill as energy savings. With such savings it is safe to say is that installing a whole-house tankless gas water heater makes perfect sense. However, before you do so, be sure to do your own research, understand your needs and check your budget before you go ahead to purchase a whole house tankless water heater.


Frequently Asked Questions

Can a tankless water heater be used for a whole house?

Yes, a tankless water heater can be used for a whole house as long as you do not exceed the tankless water heater flow rate capacity. Conversely, if you have limited hot water needs such that a tankless water heater can fulfill them easily. You can use this tankless water heater for the whole house. Still, you need to be prepared to wait a long time to actually get hot water as tankless water with limited power will take longer to heat the water to your desired temperature.

Are whole-house tankless water heaters worth it?

If you want hot water for all your family needs, you can either go for a whole house tankless water heater or multiple smaller size tankless water heater. There won’t be much difference in the cost of both options. However, a whole-house tankless water heater is higher quality parts and additional features which makes them really worthwhile in the long term.

Which brand of tankless water heaters is best?

The answer to this question is subjective to your needs. Different brands try to pursue at least one unique feature in order to have a competitive advantage over one another. Based upon your need one tankless water heater brand may be more suitable for you than the rest.

Can you run out of hot water with a tankless water heater?

A tankless water heater works on-demand, which means that it heats the water as soon as you open a fixture. This way, a tankless water heater can supply an endless amount of hot water. As long as water from the cold line doesn’t stop running, a tankless water heater will never run out of water.


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Emma Johnson
By Emma Johnson

Hi, This is Emma. Author at “BestHeaterGuide.com”. I am a graduate of Mechanical Engineering. Currently researching on heating technology. However, I have learned many home heating techniques and still learning home heating technology. And I love to share my research and reviews.

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