The Best Japanese Tankless Gas Water Heaters of 2023 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best Japanese Tankless Gas Water Heaters of 2023. Check our ranking below.

2,394 Reviews Scanned

Rank No. #1

Tankless Water Heater, 3.17 GPM Instant Hot Natural Gas Water Heater with Constant Temperature, Indoor (Natural Gas)

【Tankless Instant Hot Water Heater】No need to preheat before using the tankless water heater. As soon as you turn on the tap, the water ﬂows with your desired temperature.The screws for the water pipe joint and gas inlet are G1/2", and we provide a 3/4NPT adapter.
【High Sensitive Touch Led Display】Comes with smart digital LED display high-definition large screen, freely adjustable the temperature between 30℃-65℃.
【Multiple Security Protection】The natural gas water heater is upgraded with 12 protection methods to ensure your safety. Such as dry burning protection, over 65℃(149 °F) protection, leakage protection, etc.Note: When the temperature is below 32 degrees Fahrenheit, please drain the remaining water in the water heater at any time after use to prevent the exchanger or water pipes from freezing and bursting. Please refer to the manual for details.
【Energy and Money Saving】The hot water heater adjusts power input based on flow rate and temp setting in real time. Summer/winter 2 modes to save up to 60% on your natural gas costs.
【Quality Material】Made with brushed stainless steel material, the natural gas water heater has the function of high temperature resistance, corrosion resistance. Built-in oxygen-free copper water tank, long service time.Note: This product must be installed with a ventilation and smoke exhaust pipe for normal use.

Rank No. #2

Rheem Prestige High Efficiency 9.5GPM Indoor Natural Gas Tankless Water Heater

Energy Efficient Continuous Hot Water for the Whole Home
Low operating cost - High energy efficiency and water savings setting
Space Savings - Compact, space-saving design. Perfect for a tank replacement.
Water & Gas Leak Detection will shut down unit and provide an error code
For use indoor only

Rank No. #3

Rheem Prestige Condensing Tankless Gas Indoor Natural Gas Water Heater With Built-in Recirculation 11.0 GPM - RTGH-RH11DVLN

Hot water without the wait - or the waste
Low operating cost - High energy efficiency and water savings setting
Space Savings - Compact, space-saving design. Perfect for a tank replacement.
Water & Gas Leak Detection will shut down unit and provide an error code
Auto-Learn Programming - tracks water usage over a period of time and auto-programs to meet hot water needs at peak times

Rank No. #4

Marey GA5PORT Portable Propane Gas Tankless Water Heater, Small, White

Naturally vented outdoors: you don't need to buy a extra venting
Serves to a variety of applications, since washing your car, windows cleaning, wash your horse or your dog and take a hot shower
Perfect for campsites, cabins, remote areas or just around the house. BTU/h - 35000 BTU/h. Fuel Type - LPG(liquid propane gas). pipe fittings - 1/2 inch NPT, incoming/outgoing water and gas
Provide endless hot water on demand only as needed
No electrical connection is required

Rank No. #5

Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation

Original Design: Tankless hot water heater's Circ-Logic technology offers recirculation patterns that match your habits; For the latest in non-condensing technology that speeds up service and installation, check out our new RE160iN model
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 7.5 GPM (5 fixtures at once)
Smart, Durable Design: Includes 12-, 5-, and 1-year residential guarantee and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

SaleRank No. #6

Rinnai V65iN Tankless Hot Water Heater, 6.5 GPM, Natural Gas, Indoor Installation

Original Design: Tankless hot water heater only heats when necessary to conserve energy; For the latest in non-condensing technology and a cleaner layout that speeds up service and installation, check out our new RE160iN model
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 6.5 GPM (5 fixtures at once)
Smart, Durable Design: Enhanced scale detection helps prevent serious, long-term damage to unit; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

Rank No. #7

Rinnai V65EN Tankless Hot Water Heater, 6.5 GPM, Natural Gas, Outdoor Installation

Original Design: Tankless hot water heater only heats when necessary to conserve energy; For the latest in non-condensing technology and a cleaner layout that speeds up service and installation, check out our new RE160eN model
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 6.5 GPM (5 fixtures at once)
Smart, Durable Design: Enhanced scale detection helps prevent serious, long-term damage to unit; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

Rank No. #8

FOGATTI Natural Gas Tankless Water Heater - Outdoor Installation 6.3 GPM, 145,000 BTU White Instant Hot Water Heater, Instagas Classic 145S Series

【Outdoor installation to save space】The product is installed outdoors and does not occupy the living space. The bottom built-in forced DC fan eliminates the influence of external wind. So as to ensure the stability of combustion, achieve safety, energy saving and no pollution. We recommend that all installations are carried out in accordance with local building and plumbing codes by licensed professionals.
【Endless water supply without preheating】The heat exchanger quickly heats the water to a maximum of 140°F, which is ready for use without waiting for hot water. It can run at approximately 6.3 GPM for 40 minutes, enough to produce almost 250 gallons of hot water. Make a multi-point water supply for the whole house to meet your family's water needs.
【Precise temperature control and stable temperature】Equipped with a wire controller cord length of 164ft, allowing you to control the water temperature indoors. The burner can be burnt in sections to meet the water temperature demand in the four seasons. Benefiting from the calculation and control of the heating power 1000/s by the chip, the temperature difference of the water can be precisely controlled within ±2°F.
【Compact design for easy installation】The tankless design is 1/4 the size of a 50 gallon tank water heater, making it easy to install. The highly integrated components also provide greater safety from water pressure surges without the need to install an expansion tank.
【Excellent quality and service】CSA certification in the USA and Canada. Superior safety and durability using the world's most advanced technology. FOGATTI provides 5 years warranty on the heat exchanger and 2 years warranty on other parts.

SaleRank No. #9

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

Endless On-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature.Amperage Draw : 54 A.Special Features: ‎Energy Efficient
Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use; Dimensions 11.5 x 8 x 3.75 inches
Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that maintains water temperature even when not being used.
EcoSmart ECO 11 Sizing; 13-kilowatt tankless electric water heater ideal for providing hot water for a bathroom, small sink, office breakroom and other point-of-use or low-flow applications; provides between 1.3 and 3.1 gallons-per-minute depending on the inlet water temperature; refer to the sizing guide to select the proper solution

Rank No. #10

TCFUNDY 16L Tankless Water Heater Natural Gas, 4.23 GPM On-Demand Instant Hot Water Heater, Indoor Whole House Gas Water Heater, Digital Display & Touch Screen, Thermostatic & Energy Saving

【16L Tankless Water Heater】TCFUNDY Tankless water heater with compact design saves more space and energy efficient than traditional water heaters. LCE screen with digital temperature display and touch screen control. There are 3 modes you can choose: eco mode, common mode, tub mode.
【On-Demand Instant Water Heater】High efficiency natural Gas tankless water heater delivers 4.23 gallons per minute of on-demand endless hot water. No more waiting for long time, instant hot water for families, homes, cabins or apartments.
【Thermostatic & Energy Saving】Water heater built-in high-precision thermostat ensures constant temperature, high-thermal efficiency up to 90%. The self-modulating temperature technology only heat up water while you are using it to save energy.
【Safety of Use】Premium Oxygen-Free Copper Heat Exchanger to ensure long lifespan, automatic power-off when water is off and over-temperature protection, flame-out protection, anti-freezing protection(manual drainage needed via water relief valve), air flow pressure switch protection to ensure the safety.
【Easy Installation】Comes with 18.9“x2.36" horizontal vent pipe to ensure efficient power ventilation, with showerhead. Minimum activation rate: 0.66 GPM. Min. water pressure: 2.9 PSI, low water pressure to start, users of higher floors can enjoy pleasant experience of shower.

Rank No. #11

Natural Gas Tankless Water Heater, FOGATTI Outdoor 8.1 GPM, 180,000 BTU White Instant Hot Water Heater

We recommend that all installations of units must be done by the local building and plumbing codes of the installation location and installation be done by a licensed professional.
The tankless design means you don't have to wait 30 minutes for preheating and unlimited use of hot water.
180,000 BTU high heating capacity and maximum 8.1 GPM. It is suitable for 3-5 outlet points, which can satisfy whole family. UEF over 0.81, the high energy conversion rate can effectively reduce energy loss.
Excellent quality CSA certified in the United States and Canada. Adopting the world's most advanced technology, superior safety and durability.
Using built in forced exhaust fan at the bottom ensures stable combustion and eliminates the influence of external wind. Compact design for easy installation.

Rank No. #12

EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5

The product is highly durable
The product is easy to use
Manufactured in China
Amperage (amps): 75. Activation flow: 0. 3 GPM. Flow Rate @ 35 F Rise (gallons/min): 3. 51 gal (US)/min
The product works and is compatible with 2 X 40 AMP (DP) breakers and 2 X 8 AWG wire

SaleRank No. #13

Supplying Demand RTG20006DW UMC-117 Wired Main Remote Control for Residential Tankless Gas Water Heaters

Always search using the serial number of your water heater to make sure you select the correct control for your water heater.
Allows for easy temperature adjustment and maintenance information access | Connect up to (3) remote controls to your tankless system | 140°F Maximum | Precise temperature control 2°F increments | This digital display system remote is water resistant, but not water proof | Fits model specific water heaters
Water heater parts and accessories should only be installed by qualified technicians.
Supplying Demand replacement parts are compatible with Major Brands, but you should always verify fitment with your specific application.
SD products come in Supplying Demand packaging.

SaleRank No. #14

Tankless Water Heater 4.21GPM 16L Outdoor Portable GasHot Water Heater Instant Propane Water Heater with Digital Display Multi-Protection for Camping Trips Boat Cabins

【Premiun Water Heater】-Tankless Water Heater with CSA Approved Regulator, with more safety protection such as flame failure device, anti-freezing protection,over heating protection,Just need 3.6PSI of water pressure,4.21 gallons of hot water can be output per minute. The maximum temperature raise is 167 °F,Applicable only Propane（LPG)
【Efficient & Energey Saving】-The Propane Water Heater exchanger and main burner are desinged with advanced combustion technology to decrease gas consumption and burning noise.Maximum power output 68000btu/hour, you will get instant endless hot water easily wherever you are.Compact and lightweight structure with 11.5% energy saving technology,so you can get more hot water for less money.
【Portable Design】-Portable Water Heater size and lightweight make the water heater easy to carry and allow you to enjoy an amazing hot shower after a long day of camping, in your RV, or for giving your pet a bath,Size: 21.65x5.9x13.4 inches,Gas Hot Water Heater is Powered by 2 pcs size "D"cell Batteries.
【Complete Accessories】-This tankless water heater comes with CSA approval 5FT Gas Regulator, 5 Spray Modes high pressure Shower Head with 59in(1.5m) extended Long Stainless Steel Hose and Shower Holder,There are three interface ports under propane water heater. The left one is the Air inlet. The middle one is the shower port,and The right one is the water inlet.
【Wide Usage】- This Camping Heater,Perfect for Outdoor Shower,Which Bringing an Amazing hot Shower for you When you are Camping, Hiking, Fishing, Beaching, Portable Hot Water Sink, RV/SUV/MPV, etc. Besides, you can Also Wash your Pets with this Tankless Water Heater,Always check gas leakage before operation.

SaleRank No. #15

FOGATTI Natural Gas Tankless Water Heater, Indoor 4.0 GPM, 90,000 BTU Instant Hot Water Heater, InstaGas Classic 90

【Smaller size and better performance】It is only 1/4 the size of a 50 gallon tank water heater, yet it produces approximately 4.0 GPM of hot water through 90,000 BTU for both bathroom and kitchen hot water demand. The highly integrated components also provide greater safety from water pressure surges without the need to install an expansion tank.
【Fast and endless supply of hot water】The heat exchanger quickly heats the water to a maximum of 149℉ in a short time, and the hot water is quickly piped through to the shower and tap. No need to wait for the water temperature to heat up slowly like a tank water heater. After that it continues to operate at approximately 4.0 GPM for 40 minutes, which is enough time to produce almost 160 gallons of hot water.
【Stable and comfortable temperature】Benefiting from the calculation and control of the heating power 1000/s by the chip, the temperature difference of the water can be precisely controlled within ±2°F.
【High compatibility and easy installation】Most tank water heaters have exhaust vent, water and gas pipe that can be universally used in tankless, requiring only a simple re-layout. If installing a tankless water heater in a new house, its compact size makes it easy to install. Of course, we recommend that all installations are carried out in accordance with local building and plumbing codes by licensed professionals.
【Excellent quality and service】CSA certification in the USA and Canada. Superior safety and durability using the world's most advanced technology. FOGATTI provide 5 years warranty on heat exchanger and 2 years warranty on other parts.

Rank No. #16

Rinnai RL94IN Tankless Hot Water Heater, 9.8 GPM, Natural Gas, Indoor Installation

Original Design: Tankless hot water heater's Circ-Logic technology offers recirculation patterns that match your habits; For the latest in non-condensing technology that speeds up service and installation, check out our new RE180iN model
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 9.8 GPM (6 fixtures at once)
Smart, Durable Design: Includes 12-, 5-, and 1-year residential guarantee and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

Rank No. #17

Rheem Prestige Condensing Tankless Outdoor Natural Gas Water Heater 9.5 GPM - RTGH-95XLN-2

Energy Efficient Continuous Hot Water for the Whole Home
Low operating cost - High energy efficiency and water savings setting
Space Savings - Compact, space-saving design. Perfect for a tank replacement.
Water & Gas Leak Detection will shut down unit and provide an error code
For use outdoors with freeze protection up to -30 degrees

Rank No. #18

Rinnai V53DeN Tankless Hot Water Heater, 5.3 GPM, Natural Gas, Outdoor Installation

Endless Hot Water: Our tankless hot water heaters let you enjoy unlimited hot water flow throughout the house with a compact and durable design that fits your home and lifestyle
Energy and Space Efficient Tankless Gas Water Heater: This small hot water heater conserves energy, only heating when necessary; Enhanced scale detection lessens possibility of serious, long-term damage to unit
Optimal Water Pressure: This tankless water heater offers a high-performance hot water flow rate up to 5.3 GPM for a powerful, constant stream that serves up to 4 appliances at once
Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
Guaranteed to Last: 10-, 5-, and 1-year residential factory warranty for heat exchanger, labor, and parts, respectively

Rank No. #19

Gooble Tankless Water Heater Outdoors Portable Gas Water Heater Instant Propane Water Heate 16L 4.3GPM 32 KW,Overheating Protection, Easy to Install with

【Super Quality Product 】 : This tankless water heater, to make sure no gas leaks risk when connection ,Featuring overheating and flameout ,and anti-freezing protection to ensure the family safety.the gas supply will shut off automatically under unexpectedly flame out， or high water temperature over 167 °F.Anti-freezing apparatus draining the stock water to avoid damage of freezing under cold areas.which has a very long service life, good durability and corrosion resistance.
【Energy Saving】 :This outdoor water heater adopt compact and light weight structure design with with advanced combustion technology to decrease gas consumption and burning noise.Maximum power output 41,000BTU/Hr,you will get instant endless hot water easily wherever you are.no need to preheat ,making it more efficient and energy saving.
【Easy to Install】:Equipped with BSP pipe fittings and all necessary accesories , There are three interface ports under propane water heater. The left one is the Intake port. the middle one is the shower port,and the right one is the water inlet, which is very convenient for customers to install.The tankless water heater will "caught on fire "with improper operation. Always check gas leakage before operation.
【Widely Application】:Our gas water heater is mainly used for outdoor showering with hot water,provides you a safe and comfortable hot shower at anytime and anywhere, Compact and space-saving design is portable for the outdoors, which bringing an amazing hot shower for you when you are camping, hiking, fishing, beaching, etc. Besides, you can also wash your pets with this tankless water heater.
【Safety in use】 This is a liquid propane tankless water heater, with a detachable drain valve, automatic cut-off function and automatic ignition.Inside is equipped, with automatic water cut-off control, dry combustion protection, and over-pressure protection, allowing you to use It is very safe and reliable.

Rank No. #20

Natural Gas Tankless Water Heater Indoor, Camplux 2.64 GPM On Deamnd Hot Water Heater, CM264-NG, White

2.64 GPM Instant Hot Water -Camplux 2.64 GPM natural gas tankless water heater delivers 2.64 GPM on demand endless hot water ensures instant hot water for any small homes, cabins or apartments. On demand water heater only heats the water when you need it and no waiting for preheat.
6-IN-1 Multiple Protection- Flame-out protection, anti-freezing protection （manual drainage needed）, over-heating protection, air flow pressure switch protection to ensure the safety. Safe electronic ignition system, plugs into standard 120V electrical outlet with UL-listed cord.
Easy Installation -The tankless water heater uses standard 1/2" BSP water fitting and gas inlet. The water heater comes with 1/2 " BSP female to 1/2" NPT male gas connector adapter then you want hook this water heater to natural gas pipe directly.It also comes with 2" horizontal vent pipe,ensures efficient power ventilation. Minimum activation rate: 0.65 GPM; Maximum input rating: 68,000 BTU; Water connection location/size: Bottom/0.5-inch NPT.
Compact Design,Energy saving -The compact size instant hot water heater saves more space than traditional tanks.Trendy and modern design with fahrenheit digital temperature display. Eco and Full gas switch for energy saving and get ideal hot water temperature.
Considerate Customer Service- Here at Camplux, customer service is everything ! We offer 24 shift hours customer service make the customer experience easy and fast through our live chat, phone support & our online helpdesk. Have a question? Give us a call at (844) 538-7475.

Last update on 2023-07-30 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

How Do You Buy The Best Japanese Tankless Gas Water Heaters?

Do you get stressed out thinking about shopping for a great Japanese Tankless Gas Water Heaters? Do doubts keep creeping into your mind? We understand, because we’ve already gone through the whole process of researching Japanese Tankless Gas Water Heaters, which is why we have assembled a comprehensive list of the greatest Japanese Tankless Gas Water Heaters available in the current market. We’ve also come up with a list of questions that you probably have yourself.

We’ve done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Japanese Tankless Gas Water Heaters that you consider buying. Your questions might include the following:

Is it worth buying an Japanese Tankless Gas Water Heaters?
What benefits are there with buying an Japanese Tankless Gas Water Heaters?
What factors deserve consideration when shopping for an effective Japanese Tankless Gas Water Heaters?
Why is it crucial to invest in any Japanese Tankless Gas Water Heaters, much less the best one?
Which Japanese Tankless Gas Water Heaters are good in the current market?
Where can you find information like this about Japanese Tankless Gas Water Heaters?

We’re convinced that you likely have far more questions than just these regarding Japanese Tankless Gas Water Heaters, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Japanese Tankless Gas Water Heaters, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Japanese Tankless Gas Water Heaters. Make sure that you are only using trustworthy and credible websites and sources.

We provide an Japanese Tankless Gas Water Heaters buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Japanese Tankless Gas Water Heaters currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

Brand Value: Every brand of Japanese Tankless Gas Water Heaters has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
Features: What bells and whistles matter for an Japanese Tankless Gas Water Heaters?
Specifications: How powerful they are can be measured.
Product Value: This simply is how much bang for the buck you get from your Japanese Tankless Gas Water Heaters.
Customer Ratings: Number ratings grade Japanese Tankless Gas Water Heaters objectively.
Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Japanese Tankless Gas Water Heaters.
Product Quality: You don’t always get what you pay for with an Japanese Tankless Gas Water Heaters, sometimes less, and sometimes more.
Product Reliability: How sturdy and durable an Japanese Tankless Gas Water Heaters is should be an indication of how long it will work out for you.

We always remember that maintaining Japanese Tankless Gas Water Heaters information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Japanese Tankless Gas Water Heaters is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly! We’re here for you all the time. Contact us here. Or You can read more about us to see our vision.

The Best Japanese Tankless Gas Water Heaters of 2023 – Reviewed and Top Rated

How Do You Buy The Best Japanese Tankless Gas Water Heaters?

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