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The Best Tankless Gas Water Heater Reviews 2018-02-18T21:16:36+00:00

The Best Tankless Gas Water Heater Reviews

Congratulations on making the decision to consider a tankless water heater for your home and welcome to our Best Tankless Gas Water Heater Reviews Guide. Tankless water heaters have been on the market for many years, however, in the United States and along with the rest of the Western world, tankless water heaters are relatively unknown and generally an uncommon sight in a U.S household. On the contrary, on other continents of the world, tankless water heaters are abundant and a dime a dozen in hotels and homes alike. 

Given the many benefits associated with a tankless water heater, it is surprising that traditional hot water tanks are still the norm in the U.S even though the advantages of a tankless far outweigh those of a traditional hot water tank. Spread the news far and wide! Let’s see more U.S homes with tankless water heaters. The energy cost savings and environmental advantages of tankless water heaters are reason enough to begin the research and consideration of a new tankless water heater purchase. Tankless water heaters are the most environmentally friendly and budget friendly option.

So let’s take a look at our Best Tankless Gas Water Heater Reviews Guide (that’s a mouthful!) and if you have any feedback or would like any additional information, please don’t hesitate to contact us!  

Tankless Water Heater Considerations

Incoming Water Temperature

Incoming water temperature is an essential factor when considering a tankless water heater. If you live in the northern states of the U.S, your groundwater temperature is going to be much cooler than the southern states. The average person, however, typically showers with a water temperature of approximately 105°. A tankless water heater will need to heat the incoming water at a greater rate and work harder if you live in northern states because your groundwater temperature will be much lower than the southern states. It’s worth noting that gas tankless water heaters do have a greater heating capacity. For northern state residents, a gas tankless water heater is likely to be a better option for you.

Use the below chart to identify the approximate groundwater temperature in your region.

Incoming Water Temperature
Gallons Per Minute Chart

Fixture Requirements

Your overall water use will depend on how many occupants are living in your household and what appliances may be used at the same time. The volume of water that a tankless water heater is required to heat is measured in gallons per minute (GPM). A one or two person household will need a smaller tankless water heater; whereas a 4 person family household will require a whole house tankless water heater which on average heats 6.5 gallons or more per minute.

Use this chart to identify how many gallons per minute your water appliances will likely use on average.

Utility Services Available

First of all you need to know the available utility services in your area. A tankless propane water heater or natural gas water heater may not be an option for you if gas is not available. If you are limited to only the electric tankless heater variety, click here for our comprehensive electric tankless water heater reviews guide. If gas is an option for your household, continue reading for more information on the best tankless gas water heater.

Gas vs Electric Tankless Water Heater

PROS

  • Higher heating capacity than electric

  • Less expensive than electricity

  • Eliminates the possibility of flooding from ruptured or rusted out water tanks

  • Environmentally friendly; only the amount of water necessary at any particular moment is heated

  • Can be wall mounted, floor mounted, installed under your sink essentially taking up less room than a traditional water tank

  • High efficiency and reduced energy costs with no standby heat loss

  • Many U.S States are offering rebates of up to $200 for natural gas tankless water heaters.

CONS

  • Proper ventilation is required

  • More maintenance required than electric tankless heaters

So if you are considering a gas versus electric tankless water heater, weight up the above options and take all the considerations of both an electric tankless water heater and a gas tankless water heater to decide what the most suitable option is for your circumstances.

Condensing vs Non Condensing Tankless Water Heater

What is the difference between a condensing and non condensing tankless water heater? 

Tankless water heaters create a byproduct in the form of steam which cools and then condenses. The condensation is acidic and causes corrosion (hence the use of stainless steel heat exchangers). Non-condensing units vent the steam through corrosion resistant venting and the energy is essentially wasted. A condensing tankless water heater will recycle the additional heat and vent any remaining water vapour that is unessential for the heating process, making a condensing unit a much more energy efficient product.

Ultimately, you as the consumer need to weigh up your choices to determine what the best tankless water heater for you is; however when you are weighing up a condensing versus non condensing tankless water heater, ensure you consider the efficiency, environmental benefits and value for money that a condensing tankless water heater provides.

Takagi Tankless Water Heater Reviews

The Takagi company was established in the 1950s and have been manufacturing high quality, innovative and eco-friendly tankless water heaters for the residential and commercial market over this time. Takagi manufacture a wide range of gas tankless water heaters that come in a range of sizes from small units with a maximum flow rate of 6.6 gpm to whole house tankless water heaters with a flow rate of 10 gpm. In our best tankless gas water heater guide, we review Takagi’s best condensing tankless gas water heaters in the small, medium and large tankless water heater range.

Heat Exchangers

Takagi incorporate commercial grade heat exchangers in their tankless water heaters for added durability and reliability and are made of heat-resistant copper alloy, which is significantly stronger than the standard copper used in other heat exchangers. Takagi’s heat exchangers are resistant to the effects of erosion that can contribute to maintenance issues such as leakages.

The secondary heat exchanger, which is where the rest of the heat transfer occurs is made of high quality stainless steel. The lower temperature causes acidic condensation to occur and stainless steel is used (rather than copper) in the secondary heat exchanger to avoid any corrosion. Takagi’s condensing water heater design using both copper and stainless steel heat exchangers for optimal efficiency and durability is indicative of Takagi’s innovative and high quality designs.

Safety

Takagi incorporates exceptional safety features into each and every one of their tankless water heaters, providing assurance and peace of mind to Takagi customers. Takagi has developed a unique feature that provides continuous monitoring and maintains proper combustion at all times. The Air-Fuel Ratio (AFR) Sensor, combined with the onboard computer adjusts the fan motor speed to allow for a proper mixture ratio for the air and fuel with the outcome of minimizing emissions and maximizing efficiency.

To prevent any freeze damage that may occur, every Takagi tankless unit includes freeze protection, making a Takagi tankless heater suitable for sub-freezing conditions. The freeze protection system ensures that the water temperature within the heat exchanger does not drop below a certain level.

Takagi have also designed a way to ensure that the water temperature does not exceed unsafe levels. The Hi-Limit Switch activates by disengaging the gas valves and shuts down the tankless heater.

Takagi Tankless Water Heater (T-KJr2-IN-NG)

Specifications:

Water Flow Rate: 2.3 to 6.6gpm

Vent Type: direct vent 4″

Water Connection: 3/4″

Weight: 38lbs

Dimensions: 20 x 13.75 x 7.75

Warranty: 15 yr limited heat exchanger, 5 yr limited parts residential use

NATURAL GAS

First of our Takagi tankless reviews is the Takagi T KJR2 IN NG review.

Amongst the most well known tankless water heater brands, Takagi is a market leader and have been developing innovative and high quality tankless water heaters since 1952. Over half a century of product excellence and innovation has created a brand reputation so valuable that you know that reliability and quality will be a key feature if you purchase a Takagi gas tankless water heater.

The Takagi t kjr 2 is a compact, fully modulating, non-condensing, gas powered tankless water heater suitable for residential purposes. It is powerful enough to heat up to two shower in warmer climates where the incoming water temperature is warmer and one shower in cooler climates.

All Takagi tankless water heaters come with standard superior safety features including an internal freeze protection system (for protection in sub-freezing conditions), air fuel ratio (AFR) sensor to monitor and maintain proper combustion, hi-limit switch to ensure that the water temperature does not exceed safe levels and an overheat cut off fuse to ensure that there are no breaches in the heat exchanger drum.

Takagi T K4-IN

Specifications:

Water Flow Rate: up to 8gpm

Vent Type: direct vent 4″

Water Connection: 3/4″

Weight: 38lbs

Dimensions: 20 x 13.75 x 7.75

Warranty: 15 yr limited heat exchanger, 5 yr limited parts residential use

NATURAL GAS

The Takagi indoor tankless hot water heater is suitable for use as a medium to large sized whole home water heater. This model is one step up (in terms of heating capacity) from the Takagi Tkjr 2 and is capable of providing hot water to 2-3 fixtures simultaneously (3 in warmer climates and 2 in cooler climates).

All Takagi tankless water heaters come with standard superior safety features including an internal freeze protection system (for protection in sub-freezing conditions), air fuel ratio (AFR) sensor to monitor and maintain proper combustion, hi-limit switch to ensure that the water temperature does not exceed safe levels and an overheat cut off fuse to ensure that there are no breaches in the heat exchanger drum.

The Takagi whole house water heater features an ultra-slim, compact and lightweight design.

Takagi TM 50

Specifications:

Temperature range: 65-145°F

Water Flow Rate: 2.3 to 6.6gpm

Vent Type: direct vent 4″

Water Connection: 3/4″

Weight: 38lbs

Dimensions: 20 x 13.75 x 7.75

Warranty: 15 yr limited heat exchanger, 5 yr limited parts residential use

NATURAL GAS

The Takagi t kjr 2 is a compact, fully modulating, non-condensing, gas powered tankless water heater suitable for residential purposes. It is powerful enough to heat up to two shower in warmer climates where the incoming water temperature is warmer and one shower in cooler climates.

All Takagi tankless water heaters come with standard superior safety features including and internal freeze protection system (for protection in sub-freezing conditions), air fuel ration (AFR) sensor to monitor and maintain proper combustion, hi-limit switch to ensure that the water temperature does not exceed safe levels and an overheat cut off fuse to ensure that there are no breaches in the heat exchanger drum.

Rinnai Tankless Water Heater Reviews

Rinnai is a well-known company originating from Japan that has built up a reputation over 45 years of delivering high quality and innovative products. We have reviewed three products from the Rinnai range – the Rinnai rl75in tankless water heater, Rinnai RUR98i and the Rinnai RUC98in. Additionally, we have dedicated an entire page detailing our reviews of the Rinnai Tankless Water Heater that can be found here.

Rinnai RL75iN Natural Gas Tankless Water Heater Review

Specifications:

Temperature Range: 98° – 160°

Water Flow Rate Temperature range: 7.5 gpm

Vent Type: direct vent 3/4″

Weight: 46lbs

Dimensions: 14 x 9.3 x 23″

Warranty: 12 yr limited heat exchanger, 5 yr limited parts, 1 yr labor for residential installations

NATURAL GAS

The Rinnai direct vent heater is a large, powerful unit designed to heat two to three fixtures at once.  This means that you can run two showers and a dishwasher simultaneously.

Innovation is a key feature of the Rinnai water heater and The RL75in has been designed with a sophisticated and advanced temperature controller that not only indicates the outgoing water temperature and flow rate but also alerts the user of errors in the water heater through diagnostic codes. The temperature controller is built into the front panel allowing you to quickly identify the problem and address it.  Problems can include scale build up in the heat exchanger, air supply blockage and an over temperature warning. The installation manual provides a list of the error codes displayed, a description of the error and a solution to the problem.

It is important that you undertake regular maintenance to ensure that you maximize your gas tankless water heater’s lifespan. This requires flushing of the heat exchanger and manual draining of the water heater at least once per year. Check out the you tube videos for further information on the Rinnai Water Heater.

Summary: The Rinnai Water Heater is slightly above average in cost, however you are getting an energy efficient, highly innovative, long-lasting product built by a very reputable brand which will save you money in the long term.  The Rinnai Tankless Water Heater is considered by many one of the best natural gas tankless water heaters on the market. 

Note: if you wish to find out more about propane tankless heaters, click here to see our guide on Rinnai propane tankless water heater reviews

Rinnai RUR98in Review

Specifications:

Temperature Range: 98° – 160°

Water Flow Rate Temperature range: 7.5 gpm

Vent Type: direct vent 3/4″

Weight: 46lbs

Dimensions: 14 x 9.3 x 23″

Warranty: 12 yr limited heat exchanger, 5 yr limited parts, 1 yr labor for residential installations

NATURAL GAS

The Rinnai RUR98in tankless heater is a large, powerful unit designed to heat three fixtures simultaneously with its (maximum) 9.8 gpm flow rate.

Rinnai’s innovative ThermaCirc technology is offered in the RUR models, meaning hot water is delivered rapidly across multiple fixtures. Regardless of whether your home’s existing plumbing system has a dedicated return line, Rinnai’s Therma-Circ technology enables  recirculation to occur without a dedicated return line. This means less water and money down the drain (through easier installation) and saving on natural resources and utility costs for gas and water usage.

The RUR models offer a programmable 24 hr digital controller enables the scheduling of multiple recirculation events throughtout the day to align with usage patterns during your family’s individual peak demand times This provides optimal efficiency and convenience at the control of a button.

Innovation is a key feature of the Rinnai water heater and all of Rinnai’s tankless water heaters have been designed with a sophisticated and advanced temperature controller that not only indicates the outgoing water temperature and flow rate but also alerts the user of errors in the water heater through diagnostic codes. The temperature controller is built into the front panel allowing you to quickly identify the problem and address it.  Problems can include scale build up in the heat exchanger, air supply blockage and an over temperature warning. The installation manual provides a list of the error codes displayed, a description of the error and a solution to the problem.

It is important that you undertake regular maintenance to ensure that you maximize your gas tankless water heater’s lifespan. This requires flushing of the heat exchanger and manual draining of the water heater at least once per year. Check out the you tube videos for further information on the Rinnai Water Heater.

Summary: The Rinnai Water Heater is slightly above average in cost, however you are getting an energy efficient, highly innovative, long-lasting product built by a very reputable brand which will save you money in the long term.  The Rinnai Tankless Water Heater is considered by many one of the best natural gas tankless water heaters on the market. 

Note: if you wish to find out more about propane tankless heaters, click here to see our guide on Rinnai propane tankless water heater reviews

Rinnai ruc98in Review

Specifications:

Temperature Range: 98 to 140 deg

Water Flow Rate Temperature range: 9.5 gpm

Vent Type: direct vent 3/4″

Weight: 82lbs

Dimensions: 10 x 18.5 x 26 inches

Warranty: 12 yr limited heat exchanger, 5 yr limited parts, 1 yr labor for residential installations

NATURAL GAS

The Rinnai RUC98in tankless condensing water heater is ideal for residential and commercial environments and  is suitable for mid- to large-sized homes with enough capacity for hot water to be delivered to three fixtures simultaneously with its (maximum) 9.5gpm output.

The Rinnai RUC98in features circ-logic technology which recirculates the water from the tankless water heater through the dedicated recirculation line and back to the heater. If your home does not have a dedicated line, consider one of the RUR models which incorporates the therma-circ technology enabling the hot water to be recirculated through the line without needing to install a dedicated recirculation line.

Rinnai tankless water heaters include wi-fi technology and you are able to activate recirculation through this technology or via motion sensors that can detect when family members are present. The wi-fi technology also allows you to remotely run diagnostic checks and adjust the temperature of your hot water.

The RUC models are in the Rinnai Super-high efficiency (condensing) range offering you significant energy savings and conserving natural resources through Rinnai’s efficient and compact technology.

Rinnai is the only manufacturer to offer both concentric and twin-pipe PVC venting in the RUC models,  giving you double the flexibility in the venting options on every installation. Watch the below youtube video for more information on the RUC concentric feature.

Navien NPE 240A Tankless Gas Water Heater

Specifications:

Water Flow Rate:  up to 11.2 gpm

Vent Type: Forced Draft Direct Vent

Weight: 82lb

Dimensions: 13.2 x 17.3 x 27.4 “

Warranty: 5-15yr limited heat exchanger, 5 yr limited parts, 1 yr labor for residential installations

Energy: Natural Gas/Propane Gas

BTU: 19,900-199,900

NATURAL OR PROPANE GAS

The Navien NPE 240A brings you the latest in innovative tankless water heater technology and design with advanced condensing efficiency and cutting edge energy efficiency. The Navien Tankless Heater has been constructed with two stainless steel heat exchangers; the benefit of which is the longer life expectancy as stainless steel is far more resistant to corrosion and erosion in comparison to copper heat exchangers.

The Navien Water Heater produces low NOx emissions which is far kinder to the environment and in compliance with SCAQMD 1146.2 – the standard put in place to reduce NOx emissions from natural gas fired water heaters. Additionally, the metal fiber burner is designed to deliver a consistent air/gas mixture to improve combustion efficiency.

The Navien tankless water heater employs superior preheating technology and intelligently recognizes hot water usage patterns to provide hot water when required. The NPE model can also be converted from natural gas to propane.

A stand-out feature of the Navien On Demand Hot Water Heater is the sophisticated Front Panel Command Center. Consisting of a user friendly interface with soft touch pad, it provides self-diagnostics allowing you to swiftly identify any problems and can display the water temperature in either °F  °C.

Summary: What is the best gas tankless water heater? The Navien Tankless Water Heater npe 240a is a superior product with advanced energy efficiency and high quality features.  This gas tankless water heater ranks as one of our best rated gas water heaters available on the market in 2018! 

Rheem RTGH 84dvln Gas Tankless Water Heater

Specifications:

Water Flow Rate:  up to 8.4 gpm

Vent Type: Forced Draft Direct Vent

Weight: 78lb

Dimensions: 9.8 x 18.5 x 27.5”

Warranty: 5yr limited heat exchanger, 5 yr limited parts, 1 yr labor for residential installations

Energy: Natural Gas

BTU: 199, 000 BTU/h

NATURAL  GAS

The Rheem RTG 84DVN tankless water heater is a high performing, innovative unit from the Rheem Prestige Series. The sleek and compact design of the Rheem RTG 84 DVLN is a huge space saver and anaesthetically pleasing on the eye. You needn’t attempt to install your unit inconspicuously as it will complement your surrounding décor.

The Rheem condensing water heater features freeze protection up to -30°F, built-in condensate neutralizer, high altitude capability (up to 8,400ft above sea level) and low flow fixture compatible.

The Rheem 84 tankless water heater is capable of heating up to 3 fixtures simultaneously and is suitable for medium sized households. If one unit is insufficient for your household, Rheem has developed an EZ-Link cable to connect two tankless units together to operate as one to satisfy higher demand applications. However, the Rheem RTGH 84 is not only for residential use, it can be used in settings where multiple units are required such as hotels, restaurants, schools and hospitals. MIC-6 and MIC-185 manifold control boards are available to manifold up to 20 units if required.

The intelligent digital display shows the temperature setting and maintenance codes as part of the self-diagnostic system, alerting you to any errors within the device. A digital remote control and 120volt power cord is included with the unit.

Summary: The Rheem direct vent gas water heater is an exceptional space saver, energy saver and most importantly a fantastic cost saver!

Check out the you tube video below for more information on the Rheem RTG 84DVLN gas tankless water heater.