15 Best Gas Tankless Water Heater Today

In Brief: Best Gas Tankless Water Heater

  1. Takagi T-KJr2-IN-LP 
  2. Rheem RTGH-95DVLN 
  3. Rinnai RUC98iN Ultra Series 
  4. Rinnai V65EN 
  5. Rinnai V75iN 
  6. Takagi T-KJr2-OS-NG 
  7. Eccotemp i12-NG 
  8. Rinnai V65EP 
  9. Takagi T-H3-DV-N 
  10. Rheem RTG-64DVLN Prestige 
  11. Noritz NRC66DVNG 
  12. Camplux 10L 
  13. CAMPLUX ENJOY OUTDOOR 
  14. Eccotemp fvi12-NG FVI-12 
  15. Eccotemp FVI12-LP
How We Decided

41 products considered. 900+ reviews analyzed, 40 research hours spent, 25+ info. sources referred

More about our Methodology

Water heaters are an indispensable household accessory for most people.

Regular hot water supply is needed in countries with a cold climate and there are several companies manufacturing a wide range of products to meet these requirements regardless of the weather conditions.

Gas-based tankless water heaters are frequently used as they are comparatively low cost as compared to electric versions.

They are available to meet a wide variety of purposes like whole-house application, outdoors, portable, indoors, single point, multiple points, etc.

Comparison Table: Top Gas Tankless Water Heaters

ProductFlow Rate (GPM)Weight (lbs)BTU/hourPrice

Takagi T-KJr2-IN-LP

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

6.6 38 140,000 Check Price

Rheem RTGH-95DVLN

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

9.5 79 199,000 Check Price

Rinnai RUC98iN Ultra Series

Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater, Twin Pipe

9.8 82 199,000 Check Price

Rinnai V65EN

Rinnai V Series HE Tankless Hot Water Heater: Outdoor Installation

6.6 47.4 120,000 Check Price

Rinnai V75iN

Rinnai V Series HE Tankless Hot Water Heater: Indoor Installation

7.5 49.6 NOT LISTED Check Price

Takagi T-KJr2-OS-NG

Takagi T-KJr2-OS-NG Outdoor Tankless Water Heater, Natural Gas

6.6 38 140,000 Check Price

Eccotemp i12-NG

Eccotemp i12-NG Tankless Water Heater

3 29 80,000 Check Price

Rinnai V65EP

Rinnai V Series HE Tankless Hot Water Heater: Outdoor Installation

6.6 47.4 NOT LISTED Check Price

Takagi T-H3-DV-N

Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater, 10-Gallon Per Minute

10 59 199,000 Check Price

Rheem RTG-64DVLN Prestige

Rheem RTG-64DVLN Prestige Low NOx Indoor Direct Vent Condensing Tankless Natural Gas Water Heater

6.4 54 150,000 Check Price

Noritz NRC66DVNG

Noritz NRC66DVNG Indoor Condensing Direct Tankless Hot Water Heater, 6.6 GPM - Natural Gas

6.6 39 110,000 Check Price

Camplux 10L Outdoor Gas Tankless Water Heater

Camplux 10L Outdoor 2.64 GPM Digital Display Portable Propane Gas Tankless Water Heater

2.64 18.08 68,000 Check Price

CAMPLUX ENJOY OUTDOOR LIFE

Camplux 5L 1.32 GPM Outdoor Portable Propane Tankless Water Heater

1.58 15.43 41,000 Check Price

Eccotemp fvi12-NG FVI-12

Eccotemp fvi12-NG FVI-12 Natural Gas, 3.5 GPM, High Capacity Tankless Water Heater, White

4 29 74,000 Check Price

Eccotemp FVI12-LP

Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heaters, White

3.6 33 80,000 Check Price

Table of Contents

The following sections of the article help the reader with a brief buying guide and guidance on how to use and maintain gas tankless water heaters.

The article also reviews the top fifteen products in this category and highlights their features to help one decide the best pick for oneself.

Reviews for Best Tankless Gas Water Heater

1.best overall rating

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

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

Takagi is another company whose sole focus is on the development of high quality residential and commercial tankless water heaters.

It was established in 1952 and for over 60 years now, Takagi has been active in developing energy-efficient, eco-friendly products.

The maximum and minimum BTUs supported by this heater are 140,000 and 19,500 respectively. It is equipped with a copper heat exchanger.

The safety features of this water heater include freeze, overheat, surge protection and troubleshooting diagnostic codes. It has a maximum flow rate of 6.6 GPM.

One of the notable features of this tankless water heater is that it can operate on both natural gas or liquid propane, depending upon the user’s preference. It also requires a four-inch category III stainless steel venting.

There are inlet and outlet thermostats for constant temperature monitoring. The unit weighs 38 lbs and the dimensions of the same are 6.7 x 13.8 x 20.3 inches.

The unit has a ten-year warranty on the heat exchanger and a five-year warranty on the parts (in case of residential usage, 3 years in case of commercial usage).

It should be noted that the warranties are valid only if the water heater has been installed by a licensed technician.

Some of the key USPs of this product is listed below :

  • Energy factor of 0.81 – 0.83
  • Perfect for light residential use and radiant heating applications
  • The smallest model in the Takagi lineup
PROS:
  • The model supports natural gas and liquid propane
  • Easy, straightforward installation
  • Can handle multiple points of application with ease
  • Cost-effective
CONS:
  • Heavyweight unit
  • Not compact in size

Check Reviews & Price on Amazon

2.best overall rating

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

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

Rheem Manufacturing Company was founded in 1925 by brothers Richard and Donald Rheem in Emeryville, California. It is one of the oldest companies to exist in the business of water heaters.

However, this is not the sole product that they sell. They are also known for selling air conditions, pool heaters, HVAC systems, and furnaces for residential and commercial purposes.

Currently, they are headquartered at Atlanta, Georgia, United States.

This Rheem tankless water heater provides a 94% energy efficient output. It has a stainless steel condensing heat exchanger.

The electronic controls are designed in a manner to optimize the functions and decrease the fuel consumption of the unit.

This low NOx model goes through a variety of testing procedures internally and by third parties to ensure that it meets all quality standards.

The water heater also boasts of a high altitude capability and can work smoothly at heights up to 9,840 ft. elevation above sea level.

The water heater kit includes a digital remote control and 10 ft of thermostat wire. The freeze protection on this unit is for temperatures as low as -30 ℉.

The unit weighs 79 lbs and the dimensions of the same are 18.5 x 9.8 x 27.5 inches.

Check out the Key features of this water heater at :

 

Some of the key USPs of this water heater is listed below :

  • Self-diagnostic system for easy installation and service
  • Built-in electric blower
  • Guardian overheat film wrap (OFW), EZ-Link cable available
  • AHRI certified model
PROS:
  • A good, reputed brand
  • Good value for money
  • Prompt and friendly customer service
  • Easy to clean
  • Works well in extreme climatic conditions
CONS:
  • Heavyweight unit

Check Reviews & Price on Amazon

3.best overall rating

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater, Twin Pipe

Rinnai Corporation is a Japan-based home appliance company. It was founded way back on 1st September 1920 by Hidejiro Naito and Kanekichi Hayashi and is currently headquartered at Japan.

They are one of the leading manufacturers of gas based residential and commercial water heaters.

Some of the other products that they offer are in the gas home heating space like condensing boilers, direct vent furnaces and vent free convectors.

This tankless water heater is a part of the Sensei series which is known to be a condensing type heater series. The energy efficiency rating for this heater ranges between 0.92 and 0.96.

The space-saving design allows for an indoor installation type. The minimum and maximum showers that this unit can support subject to weather conditions are 3 and 6 respectively.

Fast hot water delivery is supported by recirculation technology. The unit has ultra-low NOx emissions and a maximum BTU of 199,000. It weighs 82 lbs and the dimensions of the same are 10 x 18.5 x 26 inches.

Check out the details of this product at :

 

Some of the key USPs of this water heater is listed below :

  • 12-year warranty on the heat exchanger and 5-year warranty on parts
  • A high flow rate of 9.8 GPM
  • Temperature range of 98° F to 185 ° F for commercial and 98° F to 140° F for residential
PROS:
  • Self-installation was easy
  • Provides hot water at consistent temperatures
  • Good product life
CONS:
  • Heavyweight
  • Temperatures could be hotter

Check Reviews & Price on Amazon

4.best overall rating

Rinnai V65EN 6.6 GPM Outdoor Low NOx Tankless Natural Gas Water Heater

Rinnai V Series HE Tankless Hot Water Heater: Outdoor Installation

This water heater by Rinnai is built only for outdoor installation. It has a flow rate of 6.5 GPM.

There is a mobile application Control-R 2.0 that allows one to schedule timers throughout the day and also allows one to set the water heater to vacation mode remotely.

The temperature range of this water heater is 98 °F – 140 °F. One of the safety features of this device is the integrated error code indicator that helps in pinpointing the exact issue that is faced by the unit in case of any troubleshooting.

The unit is also compatible with the entire line of digital controllers manufactured by Rinnai which increases the convenience of use.

Check out how to properly carry out the maintenance procedure of this tankless water heater at :

 

Some of the key USPs of this water heater is listed below :

  • 10-year warranty on the heat exchanger and 5-year warranty on parts
  • Certified for installation in manufactured or mobile homes (eg. RVs)
  • Energy factor of 0.82 for natural gas and liquid propane
PROS:
  • Easy to install
  • Works well
  • Good performance for multiple points of application
  • Good value for money
  • Water saving efficiency
  • Gets water heated quickly
CONS:

Check Reviews & Price on Amazon

5.best overall rating

Rinnai V75iN Tankless Hot Water Heater

Rinnai V Series HE Tankless Hot Water Heater: Indoor Installation

This gas based tankless water heater by Rinnai can boast of an energy efficiency factor of 0.82. It offers a temperature range from 98 ºF to 140 ºF.

One of the notable features is the leak detection mechanism that automatically shuts off the water supply to the unit to limit the property damage.

The unit comes equipped with enhances scale detection which can alert the user before any irreversible damage can take place. There is also a temperature lock that prevents accidental or unauthorized changes to the temperature.

This water heater has a residential factor warranty of 120 months on the heat exchanger and 60 months for the parts. The unit also has an impressive 7.5 GPM flow rate.

The unit has ultra-low NOx emissions making it environment-friendly. The water heater weighs about 50 lbs and the dimensions of the same are 14 x 9 x 23 inches.

Check out the installation of this water heater here :

 

Some of the key USPs of this water heater is listed below :

  • Satisfies SCAQMD
  • A unique leak detection mechanism
  • Certified for installation in manufactured (mobile) homes
PROS:
  • Works as expected, dependable
  • Quiet, noiseless operations
  • Able to support multiple points of applications easily
  • Space saving design
  • Money-saving efficiency
CONS:
  • Little slow to heat up

Check Reviews & Price on Amazon

6.best overall rating

Takagi T-KJr2-OS-NG Outdoor Tankless Water Heater

Takagi T-KJr2-OS-NG Outdoor Tankless Water Heater, Natural Gas

This unit is specifically built for outdoor installation and comes with internal anti-freeze protection. The BTU range for this water heater is 19,500 – 140,000 BTU/hr. The energy efficiency factor is 0.82.

The flow rate of this water heater is 6.6 GPM.

The heater weighs 38 lbs and the dimensions of the same are 6.7 x 13.8 x 20.5 inches.

Check out the features of this water heater series at :

 

Some of the key USPs of this water heater is listed below :

  • 12-year warranty on the heat exchanger and 5-year warranty on parts
  • Natural gas based tankless water heater
  • Energy Star certified and rated
  • Perfect for light residential and radiant heating applications
PROS:
  • A good temperature control feature
  • Easy to install
  • Great value for money
  • Noiseless operations
  • Highly recommended by users
CONS:
  • Some customers reported leaking

Check Reviews & Price on Amazon

7.best overall rating

Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heaters

Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heaters, White

Eccotemp is a family owned business based out of Charleston, Summerville, South Carolina. It was started in 2004 as a manufacturer of energy efficient products.

Their current range of offerings includes water heaters and parts and accessories for the water heaters. These water heaters are mainly whole house, portable and electric models.

This gas tankless water heater by Ecootemp is a whole house solution that offers a decent 3.6 GPM and allows saving a lot of energy in the process by activating only when in use.

Its compact design allows for installation in tight spaces and can be fit easily into small cabins or apartments provided there is a safe and efficient ventilation system in place.

The heater operates with a minimal noise output and has a digital display on the top that allows one to accurately assess and set the temperature. It has a safe electronic ignition system.

The kit includes a horizontal venting, 2 1/2″ 90-degree Elbow with Backflow Preventer, termination pipe and other installation hardware along with the water heater.

The unit weighs 33 lbs and the dimensions of the same are 29 x 17 x 11 inches.

Some of the key USPs of this water heater is listed below :

  • Can be used with a 20 to 100-pound (lb.) propane tank
  • 2 year limited warranty
  • Temperature range of 80 °F – 140 °F
  • Manual temperature controls
PROS:
  • Pros
  • Tremendous energy saver
  • Easy to install
  • Budget purchase
  • Responsive and quick customer service
CONS:
  • May not perform suitably in extreme climatic conditions

Check Reviews & Price on Amazon

8.best overall rating

Camplux 10L Outdoor 2.64 GPM Digital Display Portable Propane Gas Tankless Water Heater

Camplux 10L Outdoor 2.64 GPM Digital Display Portable Propane Gas Tankless Water Heater

Camplux is a company that manufactures various products for outdoor activities.

Their current product range includes portable & residential tankless water heaters, refurbished models, portable gas stoves, portable gas grills, water pumps, valves, and electric gas heaters.

This Camplux product comes in two versions, eco and full switch that allow one to save more gas when it can be done.

It is specifically designed for outside installation, however, can be installed indoors as well if a flue pipe or duct is installed and there is sufficient ventilation.

The safety features of this unit include anti-freezing protection, overheating protection and flame failure mechanism.

It has a compact, space-saving design which allows for easy installation in tight spaces. The energy savings of this unit are up to 11.5%.

The maximum power output is 68,000 BTU/hour which means an instant endless supply of hot water. The heater comes with CSA approved gas regulators, adaptors and any other equipment needed for installation.

The unit weighs 18.08 lbs and the dimensions of the same are 12.8 X 6.1 X 21.65 inches.

Some of the key USPs of this water heater is listed below:

  • A flow rate of 2.64 GPM
  • Water pressure range of 2.8-110.0 PSI
  • Multiple safety features for outdoor installation
  • Kit components include a showerhead and a hose
PROS:
  • Lightweight
  • Rated high on ease of installation
  • Good value for money
  • Works well in harsh weather conditions
  • The unit heats up quickly
  • Good water pressure
CONS:
  • Doesn’t have on/off switch to regulate water supply

Check Reviews & Price on Amazon

9.best overall rating

Eccotemp fvi12-NG FVI-12 Natural Gas, 3.5 GPM, High Capacity Tankless Water Heater

Eccotemp fvi12-NG FVI-12 Natural Gas, 3.5 GPM, High Capacity Tankless Water Heater, White

As opposed to the other gas-based tankless model of Eccotemp that runs on liquid propane, this tankless water heater model makes use of natural gas.

It is capable of supplying hot water to the entire household at 3.6 GPM and has a super energy saver mechanism in place. The unit shuts off when not in use saving gas.

It is suited for indoor installation provided proper ventilation has been taken care of. There is a digital display on top of the water heater that makes it easy to set and regulate the temperature of the unit.

It is practically noiseless and very compact so it can be installed in tight spaces without any hassles.

The unit weighs 29 lbs and the dimensions of this water heater are 4 x 15 x 24 inches.

Some of the key USPs of this water heater is listed below :

  • Has a safe electronic ignition system
  • 2-year limited manufacturer warranty
  • Comes with ventilation equipment and all installation hardware
PROS:
  • Well made
  • Consistent performance
  • Great value for money
  • Long lasting product
  • The water heats up fast
CONS:
  • Water temperature adjustment knob could use a better description
 

Check Reviews & Price on Amazon

10.best overall rating

CAMPLUX ENJOY OUTDOOR LIFE BD158 1.58GPM Outdoor Propane Tankless Gas Water Heater

Camplux 5L 1.32 GPM Outdoor Portable Propane Tankless Water Heater

This outdoor tankless water heater by Camplux supports a low water pressure ignition and this allows it to function with 2.8 PSI of water pressure.

It has a very compact, space-saving and aesthetically pleasing design with an attached folding handle for added portability.

The hot water output of this unit is 1.58 GPM making it suitable for all of one’s camping trip needs.

At this GPM, the maximum and minimum temperature raises are 114.8 ℉ and 46.4 ℉. Some of the safety features on this unit are oxygen depletion safety shutoff protection, anti-freezing protection, and a flame failure mechanism.

One of the best features of this tankless water heater has to be the powering of the unit supported by two D cell batteries which makes it easy to use when electricity is not readily available.

The unit weighs around 11 lbs and the dimensions are 11.61 X 4.33 X 17.32 inches.

Some of the key USPs of this water heater is listed below :

  • Stainless folding portable handle
  • Aesthetically pleasing, sleek design
  • A battery-based powering mechanism where electricity is not available
PROS:
  • Lightweight
  • Easy to use
  • Ease of installation is high
  • Good quality instructions
  • Gas consumption is low
  • An easy temperature adjustment knob
CONS:
  • The hose that comes in the kit could be of better quality
 

Check Reviews & Price on Amazon

11.best overall rating

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

Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater, 10-Gallon Per Minute

This Takagi tankless water heater has an impressive flow rate at 10 GPM. It is designed to be space saving and energy efficient.

This heater is recommended for use in most residential applications and small commercial applications like beauty salons or restaurants. It complies with the ultra-low NOx regulations set by the state of California.

The heat exchanger tubing is made of commercial grade copper alloy. Copper is advertised to be 25 times better at heat transfer than stainless steel.

This heater is also suitable for heavy residential usages such as recirculation systems or space heating. The unit can handle up to 4 showers simultaneously in warmer climates and three in cold ones.

The water heater weighs 59 lbs and the dimensions of the same are 11.2 x 17.8 x 24.9 inches.

Check out the installation of this water heater at :

 

Some of the key USPs of this water heater is listed below :

  • Satisfies the 2012 SCAQMD Rule 1146.2
  • Energy star certified
  • 15 years and 5 years limited warranty on the heat exchanger and parts respectively, for residential use
  • Temperature range of 100 ºC – 185 ºC.
PROS:
  • Great energy efficiency
  • Performs well under challenging conditions
  • Good aesthetic quality
  • Heats very quickly and to high temperatures
  • Good water flow rates
CONS:
  • Heavy unit

Check Reviews & Price on Amazon

12.best overall rating

Eccotemp i12-NG Tankless Water Heater

Eccotemp i12-NG Tankless Water Heater

This Eccotemp water heater is a whole house, and indoor gas powered model that activates only on demand and doesn’t require a pilot light.

It has a flow rating of 3 GPM and is designed for reduced energy consumption.

This model is notable for its great aesthetic features, mainly the black tempered glass front panel and a sleek, modern design with easy to use LED display controls.

The temperature controls are fully automatic and it comes with a child lock technology. The unit powers on with a safe electronic ignition system and has been tested at elevations up to 5,500 feet.

The kit includes a horizontal vent kit and other installation hardware. This comparatively lightweight unit weighs 29 lbs and the dimensions of the same are 16 x 16 x 11 inches.

Check out the detailing on this water heater at :

 

Some of the key USPs of this water heater is listed below :

  • 2-year limited manufacturer warranty
  • Suitable for vacation cabins, cottages, and smaller homes
  • Gorilla glass casing
PROS:
  • Quick and easy installation
  • Sleek design
  • Automated temperature controls
  • Great aesthetic appeal
  • Works as advertised
CONS:
  • Cannot be used if the water temperature is below freezing

Check Reviews & Price on Amazon

13.best overall rating

Rinnai V65EP 6.6 GPM Outdoor Low NOx Tankless Propane Water Heater

Rinnai V Series HE Tankless Hot Water Heater: Outdoor Installation

This Rinnai water heater is for outdoor installation only. The hot water flow rate of this unit is 6.5 GPM but it varies with the groundwater temperature.

One of the unique features of this tankless water heater unit is the Control-R 2.0 mobile app that features timers and schedules throughout the day. It also enables one to put the heater on vacation mode remotely.

The water heater comes preset at 120 °F and is adjustable to 140 °F by an installer.

It has an integrated error code indicator and is compatible with the full range of Rinnai digital controllers which makes replacement very easy in case of any trouble. The temperature range of the unit is 98 °F to 140 °F.

The water heater weighs around 48 lbs and the dimensions of the same are 9 x 14 x 23 inches.

Check out how to install a Rinnai tankless water heater at :

 

Some of the key USPs of this water heater is listed below :

  • 10-year warranty on the heat exchanger and 5-year warranty on parts
  • Certified for installation in manufactured (mobile) homes
  • Energy factors of 0.82 for both gas types
PROS:
  • Installation was easy
  • Very compact and space saving design
  • Impressive hardware quality
  • Great efficiency and flow rates
  • Quality components
  • Consistent temperature water output
CONS:

Check Reviews & Price on Amazon

14.best overall rating

Rheem RTG-64DVLN Prestige Low NOx Indoor Direct Vent Condensing Tankless Natural Gas Water Heater

Rheem RTG-64DVLN Prestige Low NOx Indoor Direct Vent Condensing Tankless Natural Gas Water Heater

This water heater model by Rheem can be installed indoors with a proper ventilation system in place and is a condensing type model. At a 35 degree rise, the water flow output is 6.4 GPM.

The water heater kit includes a UMC-117 remote controller and a 10 feet long thermostat wire. The water heater weighs 54 lbs and the dimensions of the same are 14 x 10 x 26 inches.

Check out the specifications of Rheem tankless water heaters at :

 

Some of the key USPs of this water heater is listed below :

  • Features a concentric vent system with integrated condensate collector
  • Industry Best, Next Generation Burner Technology
  • EZ-Link cable available for high demand applications
PROS:
  • Reputed brand
  • Easy to reach customer support
  • Can serve multiple points of applications comfortably
  • Adjustable flow rate
  • Cost-effective
  • Gas consumption reduced to half
CONS:
  • Warranty terms and service could be better

Check Reviews & Price on Amazon

15.best overall rating

Noritz NRC66DVNG Indoor Condensing Direct Tankless Hot Water Heater

Noritz NRC66DVNG Indoor Condensing Direct Tankless Hot Water Heater, 6.6 GPM - Natural Gas

Noritz is headquartered at California, USA and is an exclusive manufacturer of residential and commercial tankless water heaters. It has been in this industry for over 60 years.

They were the first ones to introduce a modern tankless water heater that was electronically controlled back in 1981.

This Noritz tankless water heater is a fully condensing model. It boasts of an advanced heat exchanger design and a built-in controller.

With 6.5 GPM, it has one of the highest flow rates. This gas water heater can be vented with a 3″ Schedule 40/80 PVC, PP or CPVC. It comes with a 6 feet long power cord and a remote thermostat.

The self condensing mechanism on this tankless gas water heater eliminates the need for expensive stainless steel venting or a hot exhaust.

The low NOx, high-efficiency water heater weighs 39 lbs and the dimensions of the same are 6.7 x 13.8 x 23.6 inches. There is a 12-year warranty on the heat exchanger and a 5-year warranty on the parts.

Check out the installation of a Noritz tankless water heater at :

 

Some of the key USPs of this water heater is listed below :

  • The unit comes with an atmospheric conversion kit
  • Energy factor of 0.89
  • Temperature settings from 100 ºF to 140 ºF in intervals of 5 ºF
  • AHRI certified
PROS:
  • Easy installation
  • Quiet operation of the heater
  • Consistent supply of hot water
  • Logical and easy to follow instructions
  • Excellent digitally regulated temperature output
  • Doesn’t consume much space
  • Lower than average gas consumption (~10%-20% lower)
CONS:
  • Valve kit required for installation is sold separately
  • Requires a little time for heating water

Check Reviews & Price on Amazon

 

Buying Guide for Tankless Gas Water Heater

Camplux 10L Outdoor 2.64 GPM Digital Display Portable Propane Gas Tankless Water Heater

For someone who is utterly new to the space of water heaters, the following guide gives a brief dive into the type of factors that should be given some thought before making a big purchase like this.

Water heaters typically tend to last for more than a decade when used properly making this a very big and fruitful investment.

Therefore, one should carefully consider the following factors and get acquainted with the basic terminology and requirements when looking at various gas tankless water heaters.

Ventilation space

When one is out to purchase a tankless gas water heater, one of the key factors to keep in mind is whether they are going to install it indoors or outdoors.

There are a few models that are specifically designed for outdoor installation as ventilation is essential for these types of heaters.

For the indoor variety, one should take into consideration how much space is available in their designated area to accommodate the heater as well as the pipes that would be required for suitably venting the unit.

There will also be some costs involved in the rework that should be factored in if one is installing a gas tankless water heater for the first time or switching from electric to gas.

Flow Rates

The gas tankless water heaters can be classified into different segments depending on their flow rates. There are models which offer rates of 2 to 3 GPM whereas some offer flow rates as high as 10 GPM.

These smaller flow rates are suitable for single points of application like one sink or a showerhead, in a salon or restaurants or while camping.

The higher flow rates are well suited to serve multiple faucets which could come handy for a big house.

Intended Application

Looking at a wide range of options becomes overwhelming for someone trying to purchase a gas tankless water heater for the first time.

The primary order of business is to understand the kind of application for which the heater will be used. The heaters are generally segregated for residential and commercial usage.

In case of residential usage, one should figure out if they want to use the same heater for the entire house or if it is to be used for an only one faucet, if it has to be installed close to the point of use or if there is a certain distance between the heater and the faucet. All these factors affect the model of heater to be purchased.

Energy Rating

If one is very cost conscious and would like to purchase a tankless water heater that uses gas in an economical manner, one should carefully consider the energy rating that is given to the heater.

This rating is indicative of how effectively a heater is able to use the gas without wasting it unnecessarily.

A heater with a better rating will use less gas to give a similar output as a heater with less rating. In the long term, these small gas savings add up to a significant amount.

Price

One of the last factors that can affect one’s purchase is the price. There is always a tradeoff between price and performance.

One should keep this in mind that skimping on the initial cost might actually lead to more expenses in the long run, whereas, purchasing an initial model that is slightly expensive but more energy efficient can save costs in the long run.

There can be several other considerations depending on one’s specific requirements, however, these are some general guidelines to start thinking upon for buying a good water heater.

Benefits of Tankless Gas Water Heater over Electric Tankless Water Heater

Camplux 10L Outdoor 2.64 GPM Digital Display Portable Propane Gas Tankless Water Heater The following points highlight the benefits of opting for a gas tankless water heater as opposed to an electric variant.

Higher Efficiency

A gas tankless water heater has more power compared to an electric version of comparable capacity. They are nearly three times more efficient and use up to 90% of the energy available as opposed to 80% in other variants.

It is easily able to support multiple faucets or shower heads in the house. Due to more power and efficiency, it is also more effective in cold weather conditions.

More Environment-Friendly

Since a gas-based tankless water heater makes use of natural gas or liquid propane, it is much more environment-friendly than products using petroleum or other fuels.

The heaters are designed for ultra-low NOx emissions and are strictly regulated by standards of manufacturing laid down for the same. They are also known to have 45% less non-environment friendly carbon footprint.

Reliable

A gas supply is almost never going to falter unless there is some natural calamity which disrupts the supply of the same.

This makes it more reliable than electric water heaters as these might not be able to serve one well in case of power surges or power failures.

Limitations of Tankless Gas Water Heater over Electric Tankless Water Heater

The following points elucidate a few limitations of gas tankless water heaters.

Installation Requirements

Installing a tankless gas water heater requires one to build a proper ventilation system. Therefore, it takes up more space and requires one to invest more for ensuring that the ventilation system is secure.

Emissions

While almost all the models of gas water heaters are advertised as having ultra-low NOx emissions, it is still a factor to be considered. In comparison, electric models do not have any emissions at all.

Expensive

The gas water heaters are sometimes more expensive than the electric water heaters on the get-go. The installation charges are also higher owing to the need for having a proper ventilation system in place.

How a Tankless Gas Water Heater Works and How to Use it

Camplux 10L Outdoor 2.64 GPM Digital Display Portable Propane Gas Tankless Water Heater

A gas tankless water heater comes on when it detects a flow of water through its water pipe. This happens when a connected faucet is turned on somewhere in the house. Once the water flow has been detected, an entire process takes place to heat the water and send it out.

The following few points describe how the gas tankless water heater works.

  • A tankless gas water heater will have a one-inch gas line coming in. If it is not already in place, one will have to call a plumber and get it sorted before installing the unit.
  • After passing through the pipe, the gas goes through a burner assembly or a pilot. It mixes a proper amount of air (coming from the air filter) and gas.
  • Electric ignition is needed to light the pilot. After it is ignited, the mixture will light up and heat up the heat exchanger through which a water pipe passes.
  • The water, in turn, gets heated up and then comes out of the unit through the output pipe.
  • Getting an understanding of how a gas tankless water heater works are essential for any homeowner. Having understood the mechanism, the following points specify how to use the water heater.
  • The heater has a gas valve that should be turned counterclockwise to the ON position.
  • The gas water heaters usually have an electric ignition system. The circuit breaker should be turned on and then the power switch can be turned on.
  • After the heater has been turned on, the digital display can be used to set the temperature of the water heater.
  • Some of the units also offer a remote controller that allows one to set the temperature remotely. The remote controller should be turned on before setting the temperature.

These are the preliminary steps involved in the usage of any gas tankless water heater. Any other specific instructions will be included in the manual that is specific to whatever model is purchased.

Maintenance of Tankless Gas Water Heater

Bosch Electric Tankless Water Heater - Eliminate Time for Hot Water - Easy Installation

The following are a few factors to be kept in mind for proper maintenance of the gas tankless water heater.

Pressure Valve

There is a valve mechanism that allows the built up pressure from the water heater to be released when it goes beyond a certain level.

This is useful to avoid explosions that may occur in instances when too much pressure has built up. There is a pipe that leads the water out of the unit and away from the sensitive equipment.

Anode rod

The water that passes through a water heater can have varying level of hardness. A heater that is subjected to very hard water is prone to collect calcium and chlorine deposits.

The anode rod is specifically placed for attracting these deposits so that it doesn’t damage the other components of the heater.

This rod should be checked annually or more frequently if the usage is higher or if the water heater is subjected to very hard water.

Flushing the Water Heater

The heater should be opened up annually and all the connections should be removed.

A hose should be connected to the water heater and water should be run through the entire system to remove all the sediments and impurities that are built up in the system.

Instead of water, a vinegar solution can also be used for this cleaning purpose.

Air Filter

In all gas tankless water heaters, an air filter is in place to keep the impurities out of the unit and allow fresh air to be passed inside for ignition and heating purpose.

This filter should be cleaned to remove any debris that may have accumulated to allow constant flow to the water heater.

Apart from the points mentioned above, one should also keep an eye out on all electrical connections to ensure that they are tight and correctly connected.

The gas connections should be checked frequently to detect any leakages as early as possible. These small steps ensure the safety of usage and the prolonged life of the product.

FAQs

How long does a Gas Tankless Water Heater take to Heat Water?

The heating time not only depends on the type of heat exchanger that is installed in the gas tankless water heater but also on the distance between the heater and the point of use. The longer the distance, the more time it will take to get hot water. The water also loses heat as it travels further from the heater which is not very energy efficient.

Is the Performance of a Gas Tankless Water Heater affected by Altitude?

The performance of a gas tankless water heater is affected by the altitude, unlike electric water heaters. For every 1000 feet of altitude gained, the efficiency of the gas tankless water heater reduces by 4% after 4,000 feet.

How much Propane does a Tankless Gas Water Heater use?

Different models have varied requirements of liquid propane and the consumption also depends on the energy efficiency of the water heater. But on an average, the consumption stands at 40,000 BTU which is roughly equivalent to 1.5 gallons per day.

What is the life of a Gas Tankless Water Heater?

With proper care and maintenance, a gas tankless water heater can last as long as 20 years.

Which is Cheaper – Natural Gas or Propane?

Natural gas is a mixture of a variety of gases like butane, and propane as well. In terms of cost, natural gas is the cheaper option. They are both environment-friendly.

Summary

A gas tankless water heater can serve a variety of household needs as well as commercial requirements; however, it is essential that one chooses the correct model to do so.

From the vast variety that is available for one to explore, a few brands like Rheem, and Eccotemp seem to be the customer’s favorites.

However, one should carefully consider their specific requirements and then finalize their purchase to get the best out of the product.

Here is the list of our top picks again for you. Check out the specs, customer reviews, price and offers on Amazon –

 

Last update on 2020-01-18 / Affiliate links / Images from Amazon Product Advertising API

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