Top 30 40 Gallon Gas Water Heaters on Amazon (Verified You can Buy)
A.O. Smith GCR-40LP ProMax Plus High Efficiency Liquid Petroleum Gas Water Heater, 40 gal
A. O. Smith
GCR-40LP
22.0 x 22.0 x 58.5 Inches
Ratings for A. O. Smith (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Hajoca Richmond | - | ✅ | ✅ | ✅ |
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
Features
Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
Top 2
Best for Inline
Best for Indoor
Best for Whole House
Best for Residential
Best for High Efficiency
Best Gas Water Heaters
Best for 30 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Tankless
Best for 50 Gallon
Best for 2 GPM
Best for 5 GPM
Best for 7 GPM
ThermoMate CZ422NG Natural Gas Tankless Water Heater, Up to 5 GPM 113,000 BTU, High Efficiency Instant On-Demand Hot Water for Whole House Use, Indoor Residential Water Heater with Multi-Point Heating
thermomate
CZ422NG
13.77 x 13.77 x 21.65 Inches
22.0 Pounds
0.81 UEF
Ratings for thermomate (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| ThermoMate Official | - | ❌ | ❌ | ❌ |
Features
[Max 5 GPM & 113,000 BTU] - The ThermoMate instant hot water heater can supply two showers simultaneously, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. No waiting time, no cold water shocks, perfect for busy households. Adopting advanced water flow sensor, the built-in chip can adjust the heating power 20,000 times per second, ensuring that the hot water within ±1℉ fluctuations for a comfortable shower experience.
[Safety & Reliable] - This gas tankless water heater integrates 8 protections: boil-dry, freeze, flame-out, overheating, over-temperature, pipe blockage, high-temperature lock, and excessive air pressure. Equipped with 4 ceramic heating cores, it auto-activates frost protection when temperatures hit 41°F (5℃). The energy-smart system uses minimal electricity to generate gentle warmth, preventing pipe ice buildup without high energy costs.
Top 3
Best for Rheem
Best for Outdoor
Best for Rheem
Best Gas Water Heaters
Best for 50 Gallon
Best for 60 Gallon
Best for Takagi
Best for Rheem
Best for 2 GPM
Best for 3 GPM
Best for 7 GPM
Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater, 7.0 GPM, Gray
Rheem
RTG-70XLN-3
9.4 x 13.5 x 20.75 inches
39.25 Pounds
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
High-efficiency tankless gas water heater delivers up to 7.0 GPM, perfect for 2–3 bathroom homes with multiple hot water needs like showers and laundry.
Powered by natural gas with 160,000 BTUs, this durable tankless unit ensures fast, reliable hot water—even during peak household demand.
Top 4
Best for Rheem
Best for Gas Powered
Best for Indoor
Best for Residential
Best for High Efficiency
Best for Rheem
Best Gas Water Heaters
Best for 30 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for Tankless
Best for 50 Gallon
Best for Takagi
Best for Noritz
Best for Rheem
Best for Rinnai
Best for 3 GPM
Best for 5 GPM
Best for 7 GPM
Best for 15 GPM
Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater 7.0 GPM, 160,000 BTUs
Rheem
RTG-70DVLN-3
10.27 x 13.5 x 24.2 inches
46.5 pounds
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
High-efficiency tankless gas water heater delivers up to 7.0 GPM, perfect for 2–3 bathroom homes with multiple hot water needs like showers and laundry.
Powered by natural gas with 160,000 BTUs, this durable tankless unit ensures fast, reliable hot water—even during peak household demand.
Top 5
Best for GASLAND
Best for Indoor
Best for Residential
Best Gas Water Heaters
Best for 30 Gallon
Best for 50 Gallon
Best for 75 Gallon
Best for Tankless
Best for Noritz
Best for GASLAND
GASLAND Gasmart E 199,000 BTU Tankless Water Heater, Up to 7.6 GPM, CSA Certified Whole House Natural Gas Indoor Installation Residential On-demand Instant Hot Water Heater, CE686NG
GASLAND
CE686NG
14.25 x 14.25 x 24.69 inches
37.5 pounds
Ratings for GASLAND (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Gasland | - | ❌ | ❌ | ❌ |
Features
Unlimited Hot Water On Demand -- Unlike traditional tank water heaters, our tankless gas water heater provides unlimited hot water whenever you need it. No more waiting for the water to reheat — enjoy continuous hot water for showers, laundry, or washing dishes without interruption.Certified by CSA and equipped with multiple safety features, it meets the highest safety standards for reliable operation.
Energy Efficient & Eco-Friendly -- With an industry-leading UEF of 0.8, our tankless water heater is 34% more energy-efficient than a 50-gallon tank water heater, whose UEF is only 0.6. Save on your energy bill while reducing NOx greenhouse gas emissions by 65% compared to a 50-gallon gas tank. It’s better for the environment and your wallet!
Top 6
Best for Gas Powered
Best for Battery
Best for LP
Best for Propane Liquid
Best for Outdoor
Best for Propane
Best Gas Water Heaters
Best for 30 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for 6 GPM
Outdoor Propane Tankless Water Heater - 6L 1.58 GPM Portable Gas Water Heater with Handle & Overheating Protection, Instant Hot Water for RV Cabin Camping Boat Barn
Amzgachfktch
JSD001-6LW
14.0 x 14.0 x 22.0 Inches
15.5007 pounds
Ratings for Amzgachfktch (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| FanmiTechnology | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
【Ultra Slim Design】 6L portable water heater product size 11.8 (L) x 5.3(W) x 17.3 (H) inches, only weight 12lb. The compact design is suitable for carrying on the go. This outdoor water heater comes with foldable handle, easy to hang and store. Package includes 5 feet premium on/off shower head, 5 feet gas regulator, 1 set US-standard garden hose adapter, and 1 installation hardware pack. It only takes you a few minutes to install it.
【Endless Instant Hot Water】 Maximum power output 40,000BTU/Hr. Get instant endless hot water easily wherever you are. No need to preheat before using tankless water heater. As soon as you turn on the tap, the water flows with your desired temperature. Also, 1.58 gallons of hot water can be produced per minute at the flow rate of 1.58 GPM. Low water pressure start up, just need 2.5 PSI of water pressure to start.
Top 7
Best for Whole House
Best Gas Water Heaters
Best for 30 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for Tankless
Best for 50 Gallon
Best for Takagi
Best for 2 GPM
Best for 4 GPM
MIZUDO Natural Gas Tankless Water Heater, Indoor or Outdoor Convertible Installation, Max 5.1 GPM 120,000 BTU, WiFi&APP Control CSA Certified for Large Families Whole House, GEN 3
MIZUDO
FDG-CS120AW-NG
14.56 x 14.56 x 22.83 inches
Ratings for MIZUDO (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Mizudo Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
[Flexible Indoor&Outdoor Installation Solution]: Mizudo innovative natural gas tankless water heater indoor offers versatile installation options to meet various home configurations. Convert from indoor to outdoor use with accessory kits (Purchase Required), providing homeowners unprecedented flexibility for space utilization
[Smart WiFi and App Control]: Manage your tankless water heater gas remotely through the dedicated mobile application. Adjust temperature settings, monitor energy usage, and receive maintenance notifications from anywhere
Top 8
Best for High Efficiency
Best Gas Water Heaters
Best for 30 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for Tankless
Best for 2 GPM
APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM, Indoor Tankless Water Heater, 95,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display,Space Gray
APUS
AP-AWH-Q13NG
5.9 x 5.9 x 20.55 inches
19.18 pounds
High
Ratings for APUS (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| APUS WATER EQUIPMENT | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Powerful & High-Capacity: This high-performance gas tankless water heater delivers 95,000 BTU heating capacity with 4.42GPM high flow rate, featuring innovative 0.66GPM low-flow start technology. As a versatile natural gas tankless water heater, it meets simultaneous hot water demands for 2 showers plus 1 sink while maintaining stable temperatures even during peak usage.
Precise & Steady: With high-precision sensors and smart CPU technology, this tankless gas water heater maintains water temperature within ±1°F of your desired setting (adjustable from 95°F-140°F). No more sudden hot/cold shocks—just perfectly steady water for showers, washing, and more, even with multiple faucets running. Enjoy worry-free comfort every time!
Vancepic Natural Gas Tankless Water Heater Indoor,4.3 GPM | 3-4 Point Use for Family, 100,000 BTU, on Demand Instant Hot Water Heater with LED Display, Silent operation, Child Lock Design
VancEpic
VH10K-W-NG-U01
14.4 x 14.4 x 24.6 inches
25.1 Pounds
Ratings for VancEpic (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Vancepic WarmHome Mall | - | ❌ | ❌ | ❌ |
Features
𝐀𝐢𝐫𝐁𝐨𝐨𝐬𝐭 𝐂𝐨𝐦𝐛𝐮𝐬𝐭𝐢𝐨𝐧, 𝐏𝐨𝐰𝐞𝐫𝐟𝐮𝐥 𝐇𝐨𝐭 𝐖𝐚𝐭𝐞𝐫: AirBoost preheated air technology enhances combustion efficiency, delivering up to 100,000 BTU and 4.3 GPM continuous hot water. This natural gas tankless water heater easily supports 3-4 water outlets for whole-house hot water needs.
±𝟏°𝐅 𝐏𝐫𝐞𝐜𝐢𝐬𝐞 𝐓𝐞𝐦𝐩𝐞𝐫𝐚𝐭𝐮𝐫𝐞 𝐂𝐨𝐧𝐭𝐫𝐨𝐥: Intelligent gas water and temperature linkage automatically adjusts heating output to maintain water temperature within ±1°F. Enjoy stable, comfortable hot water without sudden temperature fluctuations.
Top 10
Best for Rheem
Best for Outdoor
Best for High Efficiency
Best for Rheem
Best Gas Water Heaters
Best for 50 Gallon
Best for 60 Gallon
Best for 80 Gallon
Best for Tankless
Best for 50 Gallon
Best for Takagi
Best for Rheem
Best for Rinnai
Best for 3 GPM
Best for 10 GPM
Best for 15 GPM
Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater 8.4 GPM, 180,000 BTUs
Rheem
RTG-84XLN-3
9.4 x 13.5 x 20.75 inches
39.25 Pounds
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Columbiatradestock (S/N Info Recorded) | - | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
High-efficiency tankless gas water heater delivers up to 8.4 GPM, perfect for 2–3 bathroom homes with multiple hot water needs like showers and laundry.
Powered by natural gas with 180,000 BTUs, this durable tankless unit ensures fast, reliable hot water—even during peak household demand.
APUS Tankless Water Heater Natural Gas, Up to 3.6 GPM, Indoor Tankless Water Heater, 80,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display,Space Gray
APUS
AP-AWH-Q10NG
19.29 x 19.29 x 27.59 inches
19.18 pounds
High
Ratings for APUS (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| APUS WATER EQUIPMENT | - | ❌ | ❌ | ❌ |
Features
Powerful & High-Capacity: This high-performance gas tankless water heater delivers 80,000 BTU heating capacity with 3.6 GPM high flow rate, featuring innovative 0.53 GPM low-flow start technology. As a versatile natural gas tankless water heater, it meets simultaneous hot water demands for 2 showers plus 1 sink while maintaining stable temperatures even during peak usage.
Precise & Steady: With high-precision sensors and smart CPU technology, this tankless gas water heater maintains water temperature within ±1°F of your desired setting (adjustable from 95°F-140°F). No more sudden hot/cold shocks—just perfectly steady water for showers, washing, and more, even with multiple faucets running. Enjoy worry-free comfort every time!
Top 12
Best for CAMPLUX
Best for Mini
Best for Thermostat
Best for Wall
Best for 120 Volt
Best for 30 Gallon
Camplux ME40 Mini Tank Electric Water Heater 4-Gallon with Cord Plug,120 Volts
CAMPLUX ENJOY OUTDOOR LIFE
ME40
11.75 x 11.75 x 19.25 Inches
18.2 Pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ✅ | ✅ | ✅ |
| Amazon.com | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Saving Energy & Money- Built in insulation foam, reduces heat loss. 4-gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it.
High Quality Built & Elegant Design- Camplux electric water heater has glass-lined tank for long service life and easy to maintain. Elegant streamline design cover, made your kitchen more pretty.
CAMPLUX Climatech 5 Tankless Water Heater Gas Outdoor 6.86 GPM Up to 8.4 GPM,199,000 BTU, CSA Certified On Demand Gas Tankless Hot Water Heater Natural Gas, 3-8 Persons Whole House, WA686
CAMPLUX ENJOY OUTDOOR LIFE
WA686M-NG
6.5 x 6.5 x 22.24 Inches
39.0 pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
𝐔𝐩 𝐭𝐨 𝟖.𝟒 𝐆𝐏𝐌 𝐇𝐨𝐭 𝐖𝐚𝐭𝐞𝐫 𝐇𝐞𝐚𝐭𝐞𝐫: Up to 8.4 GPM, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. Gas tankless water heaters delivers 6.86 GPM instant hot water on demand, ensuring your entire family enjoys the comfort of hot water anytime without waiting. Outdoor installation, can be wire controller control temperature adjustment. Authentic traffic metrics, not fake.
𝐌𝐮𝐥𝐭𝐢-𝐏𝐫𝐨𝐭𝐞𝐜𝐭𝐢𝐨𝐧:CAMPLUX WA686M tankless hot water heaters CSA certified, highlighting its safety and quality standards, it's the perfect upgrade for efficient and reliable hot water in your home. Outdoor gas water heater has six types of protection when energized, Anti-Freezing Protection, Dry Combustion Protection, Overheat Protection, High Water Pressure Protection, Low water flow protection, Flame Failure Protection.
APUS Tankless Water Heater Propane Gas, Up to 4.42 GPM, Indoor Hot Water Heater, 95,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display, Space Gray
APUS
AP-AWH-Q13LPG
5.9 x 5.9 x 20.55 inches
19.18 Pounds
High
Ratings for APUS (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| APUS WATER EQUIPMENT | - | ❌ | ❌ | ❌ |
Features
Powerful & High-Capacity: This high-performance propane tankless water heater delivers 95,000 BTU heating capacity with 4.42GPM high flow rate, featuring innovative 0.66GPM low-flow start technology. As a versatile propane tankless water heater, it meets simultaneous hot water demands for 2 showers plus 1 sink while maintaining stable temperatures even during peak usage
Precise & Steady: With high-precision sensors and smart CPU technology, this tankless propane water heater maintains water temperature within ±1°F of your desired setting (adjustable from 95°F-140°F). No more sudden hot/cold shocks—just perfectly steady water for showers, washing, and more, even with multiple faucets running. Enjoy worry-free comfort every time
Top 15
Best for Inline
Best for Tanked
Best for Gas Powered
Best for NG
Best for Indoor
Best for Whole House
Best for Propane
Best Gas Water Heaters
Best for 30 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Tankless
Best for 40 Gallon
Best for 80 Gallon
Best Tankless Water Heaters
VEVOR Tankless Water Heater Gas, 4.3Gal Instant Water Heater, 100000 BTU, Silver Gray, Smart Temperature Control, Multiple Security Protections, Indoor Use for Whole House
VEVOR
JSQ30-A
13.78 x 13.78 x 21.65 inches
19.75 Pounds
Ratings for VEVOR (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Enjoy Instant Hot Water: This 4.3Gal, 100,000 BTU/h tankless water heater powered by gas, lets you and your family say goodbye to cold water and enjoy constant, comfortable hot water for showers and more
±1℉ Precision Temperature Control: Smart sensors maintain the water temperature within ±1℉ of the set value, avoiding large fluctuations and ensuring a consistent and comfortable water temperature
Natural Gas Tankless Water Heater, 4.74 GPM 18L Indoor,Constant propane water heater,Instant Hot Natural Gas Water Heater with Fahrenheit Digital Display,Multi-Protection
forimo
CT1414-HWRSQ
13.8 x 13.8 x 21.7 Inches
Ratings for forimo (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| forimo | - | ❌ | ❌ | ❌ |
Features
【Tankless Water Heater】- Natural Gas Tankless Water Heater with Steady Temperature Control & Multiple Safety Protections (Flame Failure Device, Overheating Protection). Only 3.6PSI water pressure required, outputs 4.74 gallons of hot water per minute, maximum temperature raise up to 75℃. Applicable exclusively to Natural Gas (LNG).
【Efficient & Energy Saving】- The 4.74 GPM Instant Natural Gas Water Heater features a maximum power output of 81,888 BTU/hour, providing on-demand hot water for 2-3 points of simultaneous water supply to meet bathroom and kitchen hot water demand. This Natural Gas Water Heater’s heat exchanger and main burner are designed with advanced combustion technology, which effectively decreases gas consumption and reduces burning noise.
Top 17
Best for 60 Gallon
CAMPLUX Climatech 7 170,000 BTU(Real Data) Tankless Water Heater Gas, 6.86 GPM(Up to 7.6 GPM), CSA Certified On Demand Tankless Hot Water Heater Natural Gas Indoor for Whole House, 4-6 Outlets
CAMPLUX ENJOY OUTDOOR LIFE
CA686WNG
14.3 x 14.3 x 7.3 Inches
37.5 pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ❌ | ❌ | ❌ |
| Woot | 115 | ❌ | ❌ | ❌ |
Features
𝐖𝐡𝐨𝐥𝐞-𝐇𝐨𝐮𝐬𝐞 𝐆𝐚𝐬 𝐇𝐨𝐭 𝐖𝐚𝐭𝐞𝐫 𝐏𝐨𝐰𝐞𝐫: 170,000 BTU(Real Data, No Exaggeration) natural gas water heater delivers 6.86 GPM - runs 6 points simultaneously. Up to 7.6 GPM, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. Built-in -20°F freeze protection with automatic drain assist. Oxygen-free copper heat exchanger Improved heat transfer efficiency.
𝐈𝐧𝐬𝐭𝐚𝐧𝐭 𝐆𝐚𝐬 𝐇𝐨𝐭 𝐖𝐚𝐭𝐞𝐫 𝐖𝐢𝐭𝐡𝐢𝐧 𝟐 𝐒𝐞𝐜𝐨𝐧𝐝𝐬: With 170,000 BTU output and 4 flame settings, the gas hot water heater adjusts to seasonal needs, preventing overheating in summer while saving energy for a comfortable, eco-friendly shower. On-demand gas water heater eliminates 30-minute tank preheating. 80% faster ignition than standard NG models. Precision flame control prevents temperature fluctuation.
Top 18
Best Gas Water Heaters
Best for 30 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Tankless
Best for Eccotemp
Best for 4 GPM
Tankless Water Heater, Novieex On Demand Water Heater Natural Gas, Up to 4.3 GPM, 100,000 BTU Instant Hot Water Heater with LED Display, Indoor Installation, 2-4 Point Use for Family Bathroom Kitchen
NOVIEEX
RS-16
28.54 x 17.32 x 10.83 Inches
19.84 pounds
Ratings for NOVIEEX (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| NOVIEEX Global | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Woot | 115 | ❌ | ❌ | ❌ |
Features
【Note 】 This is 4.3GPM natural gas model. Gas rated pressure: 8.04" w.c. (2.0 kPa), Gas Inlet & Cold Water Inlet & Hot Water Outlet：NPT 1/2", Power Supply: 110V-120V AC/60Hz, Water Pressure Range: 1.5-116 psi (0.01-0.8MPa)
【Reliable Hot Water on Demand】 With 100,000 BTU power, this on demand water heater delivers up to 4.3 GPM instant hot water. You can comfortably run a shower, kitchen faucet, and bathroom sink simultaneously—all without any noticeable temperature drop.
Top 19
Best for Tankless
SNDOAS Tankless Water Heater Natural Gas, Up to 4.23 GPM 853,00 BTU, ±1°F Precise Temperature, Anti-Freeze Protection, Oxygen-Free Copper Heat Exchanger, Ultra Quiet, Indoor Whole House
SNDOAS
IF.JSQ25-W13NA
13.8 x 13.8 x 21.6 Inches
Ratings for SNDOAS (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| globalelectricaltrading | - | ❌ | ❌ | ❌ |
Features
【High-Efficiency Tankless Hot Water On Demand】Experience instant and endless hot water with our gas tankless water heater, delivering up to 4.23 GPM (16 L/min) flow rate. Perfect for whole-house use, it effortlessly handles multiple showers and appliances simultaneously—no more waiting for water to heat up
【Anti-Freeze Protection & All-Round Safety】Equipped with overheat, dry burn and exhaust blockage protection; powerful fan prevents CO leakage. Built-in anti-freeze device resists -5℃/23°F low temperature.
Ranein Natural Gas Tankless Water Heater, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot Water Heater
Ranein
RH10K
16.9291 x 16.9291 x 25.5906 inches
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Powerful On-Demand Heating: 100,000 BTU & 4.3 GPM for this tankless water heater gas, supports 3-4 water points simultaneously, delivers endless hot water on demand with no waiting.
4 Intelligent Preset Modes: One-click switch for 4-season/Kitchen/Bathtub/Shower modes; 4-season auto-matches temp, kitchen defaults to 100°F, bathtub supports 50-800L volume adjustment.
Top 21
Best for 40 Gallon
Powered Anode Rod for Water Heater, Titanium Electric Anode Rod Replacement, Eliminates Rotten Egg Sulfur Smell in 24H, Protects Tank from Corrosion & Limescale, Fits 40-99 Gallon Water Heaters
Prukbiar
TC-40
1.9685 x 1.9685 x 1.9685 Inches
Ratings for Prukbiar (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Chanchuang | - | ❌ | ❌ | ❌ |
Features
【Eliminate Rotten Egg & Sulfur Smell】 This powered anode rod helps remove unpleasant rotten egg and sulfur odors from hot water within 24 hours, providing cleaner, fresher water for daily use.
【Advanced Tank Corrosion Protection】 Designed to help protect your water heater tank from rust, corrosion, and sediment buildup, improving heating efficiency and extending the life of your water heater.
Bradford White BWC RE340T6-1NCWW 40GAL 240V, 20 x 20 x 62 inches
Bradford White
RE340T6-1NCWW
20.0 x 20.0 x 62.0 inches
150.0 pounds
Ratings for Bradford White (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| ✅ HomePlumbing ✅ | 3,966 | ✅ | ✅ | ✅ |
| Data Alchemy | - | ✅ | ✅ | ✅ |
| Tropical Supply | - | ❌ | ❌ | ❌ |
| Fanatical Trading | - | ❌ | ❌ | ❌ |
| Voomi Supply | - | ❌ | ❌ | ❌ |
Features
Includes 4500 watt elements
Non-simultaneous
Top 23
Best for Tanked
Best for Electric
Best for Battery
Best for NG
Best for Compact
Best for Thermostat
Best for Timer
Best for Waterproof
Best for Residential
Best for 120 Volt
Best for Boiler
Best for 10 Gallon
Best for 20 Gallon
Best for 30 Gallon
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 100 Gallon
VEVOR Electric Water Heater, 18 Gallon Tank Instant Hot Water Heater, 1.6KW Tankless Water Heater with Knob Control, IPX4 Waterproof Side Connection On Demand Heaters for Shower, Bath
VEVOR
FJI-POR-70S2
16.1417 x 16.1417 x 30.7087 inches
53.0 pounds
Ratings for VEVOR (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Suplander | - | ❌ | ❌ | ❌ |
| VEMIXO | - | ❌ | ❌ | ❌ |
Features
18-Gallon Water Capacity: With a 18-gallon/70L storage capacity, this heater provides ample hot water for family needs, including dishwashing and laundry. Its 1600W high-power heating reduces wait time for hot water at the faucet.
Immersion Heating Element: The extended immersion heating element ensures continuous hot water delivery for 24 hours. It heats water up to 167℉ / 75℃ and features an LED heating display and rotary temperature control, adjustable from 30℃ to 75℃ / 86℉ to 167℉.
Top 24
Best for GASLAND
Best for Indoor
Best for Residential
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 50 Gallon
Best for GASLAND
GASLAND Gasmart E Natural Gas Tankless Water Heater Indoor, Up to 5.8 GPM 150,000 BTU, CSA Certified Whole House Installation Residential On-demand Instant Hot Water Heater, CE528NG
GASLAND
CE528NG
14.25 x 14.25 x 24.69 inches
33.1 pounds
Ratings for GASLAND (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Gasland | - | ❌ | ❌ | ❌ |
Features
Unlimited Hot Water On Demand -- Unlike traditional tank water heaters, our tankless gas water heater provides unlimited hot water whenever you need it. No more waiting for the water to reheat — enjoy continuous hot water for showers, laundry, or washing dishes without interruption.Certified by CSA and equipped with multiple safety features, it meets the highest safety standards for reliable operation.
Energy Efficient & Eco-Friendly -- With an industry-leading UEF of 0.8, our tankless water heater is 34% more energy-efficient than a 50-gallon tank water heater, whose UEF is only 0.6. Save on your energy bill while reducing NOx greenhouse gas emissions by 65% compared to a 50-gallon gas tank. It’s better for the environment and your wallet!
Top 25
Best for Propane
Best Gas Water Heaters
Best for 50 Gallon
Best for 60 Gallon
Best for Tankless
Novieex Propane Gas Tankless Water Heater Up to 4.3 GPM 100,000 BTU, Indoor
NOVIEEX
RS-16
13.78 x 13.78 x 23.23 inches
19.84 Pounds
Ratings for NOVIEEX (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| NOVIEEX Global | - | ❌ | ❌ | ❌ |
| Woot | 115 | ❌ | ❌ | ❌ |
Features
【Note 】 This 4.3GPM propane gas model. Gas rated pressure: 11.24" w.c. (2.8 kPa), Gas Inlet & Cold Water Inlet & Hot Water Outlet：NPT 1/2", Power Supply: 110V-120V AC/60Hz, Water Pressure Range: 1.5-116 psi (0.01-0.8MPa)
【Reliable Hot Water on Demand】 With 100,000 BTU power, this on demand water heater delivers up to 4.3 GPM instant hot water. You can comfortably run a shower, kitchen faucet, and bathroom sink simultaneously—all without any noticeable temperature drop.
Top 26
Best for 30 Gallon
Ranein Propane Gas Tankless Water Heater, 8.5 GPM, 190,000 BTU, Outdoor
Ranein
RHO19K-LPG
15.08 x 15.08 x 24.25 Inches
44.0 pounds
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
Features
Fans Placed Underneath: It will be more secure in terms of safety, and no smoke backflow will occur. The blower has large power and can automatically adjust the rotating speed according to the change of external wind pressure and the change of water temperature to provide sufficient oxygen for gas combustion, ensuring full combustion and safer use. Low noise and longer service life.
No Waiting Required: Unlike traditional tank water heaters, tankless water heaters eliminate the need for a 30-minute preheating wait time, allowing you to have unlimited hot water on demand.
Top 27
Best for 80 Gallon
Ranein Natural Gas Tankless Water Heater, Outdoor Max 8.5 GPM, 190,000 BTU Instant Hot Water Heater
Ranein
RHO19K-NG
15.08 x 15.08 x 24.25 Inches
44.0 Pounds
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
Features
Fans Placed Underneath: It will be more secure in terms of safety, and no smoke backflow will occur. The blower has large power and can automatically adjust the rotating speed according to the change of external wind pressure and the change of water temperature to provide sufficient oxygen for gas combustion, ensuring full combustion and safer use. Low noise and longer service life.
No Waiting Required: Unlike traditional tank water heaters, tankless water heaters eliminate the need for a 30-minute preheating wait time, allowing you to have unlimited hot water on demand.
Top 28
Best Gas Water Heaters
Best for 30 Gallon
Best for 50 Gallon
Best for 80 Gallon
Best for Tankless
Best for 6 GPM
APUS Natural Gas Tankless Water Heater 140,000 BTU Indoor Installation Up to 6.8 GPM, Zero Cold Water for Technology Instant Hot Water on Demand, Smart Wi-Fi App Control
APUS
AP-AWH-Q20NG
7.09 x 7.09 x 21.26 inches
26.9 Pounds
High
Ratings for APUS (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| APUS WATER EQUIPMENT | - | ❌ | ❌ | ❌ |
Features
Instant Hot Water: This upgraded smart natural gas tankless water heater delivers consistent performance with its 140,000 BTU burner and durable oxygen-free copper heat exchanger. With the latest intelligent heating technology, it provides hot water in just 1 second, giving you instant comfort without the wait.
Zero Cold Water Tech - Instant Hot Water：Our tankless water heater gas system features APUS exclusive single-circulation technology that eliminates cold water wait time. This on demand water heater delivers instant hot water while its 24/7 ECO smart cycle saves 40% more energy than conventional hot water heaters.
Top 29
Best for Tanked
Best for Mini
Best for Timer
Best for Under Sink
Best for 120 Volt
Best for 30 Gallon
KENUOS 4 Gallon Water Heater Under Sink Instant Hot Water Heaters 1500W 110V 120V Mini Tank,Under Counter Water Heater with Safety Vavle 1/2" NPT for Kitchen,Bathroom,Camper,RV,White
KENUOS
SY-15
13.5 x 13.5 x 13.8 inches
10.0 pounds
Ratings for KENUOS (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon Resale | - | ❌ | ❌ | ❌ |
| KENUOS-US | - | ❌ | ❌ | ❌ |
Features
Rapid Hot Water Supply and Recovery-Kenuos 4 gallon water heater features a 1500W heating power and an upgraded L-shaped 316 stainless steel heating tube, enabling rapid heat conduction with a thermal efficiency of up to 98%. which makes our mini tank water heater can provide hot water in as little as 8 minutes,meeting your demand for a fast water heating solution
Customer Friendly 4 Gallon Water Heater-Our under sink water heater comes equipped with a 3-way diverter valve that splits the water flow into two, meeting multi-point water supply needs.It also includes two 24 inch 3/4" ID to 1/2" ID adapter hoses, solving the problem of pipe compatibility with different regional specifications.Additionally,a temperature and pressure relief valve and mounting kit are provided, eliminating the need for you to purchase any extra accessories
Natural Gas Tankless Water Heater Indoor,HeatRova 4.3 GPM 102,000 BTU,Instant Hot Water,Constant Temperature,Pure Copper Heat Exchanger,3/4" NPT Connector,Energy-Saving,On-Demand for 3–4 Fixtures
Heatrova
TGHT002
13.7 x 13.7 x 13.7 Inches
Ratings for Heatrova (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| TOPGRIL LLIMITED | - | ❌ | ❌ | ❌ |
Features
INSTANT HOT WATER FOR LARGER HOMES:This indoor natural gas tankless water heater delivers instant hot water on demand with a powerful 4.3 GPM flow rate and 102,000 BTU heating capacity, providing endless hot water for 3–4 fixtures simultaneously. Ideal for showers, kitchens, and bathrooms in larger residential homes.
INTELLIGENT CONSTANT TEMPERATURE CONTROL:Equipped with advanced intelligent temperature regulation and Constant Temperature PLUS technology, this natural gas tankless water heater automatically adjusts the air-fuel ratio to maintain stable water temperature within ±1℉, even when multiple outlets are used at the same time, helping prevent sudden temperature fluctuations and scalding.
Top 10 40 Gallon Gas Water Heaters - Verified to Buy (October 2026)
- 1. A.O. Smith GCR-40LP ProMax Plus High Efficiency Liquid Petroleum Gas...
- 2. ThermoMate CZ422NG Natural Gas Tankless Water Heater, Up to 5...
- 3. Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water...
- 4. Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water...
- 5. GASLAND Gasmart E 199,000 BTU Tankless Water Heater, Up to...
- 6. Outdoor Propane Tankless Water Heater - 6L 1.58 GPM Portable...
- 7. MIZUDO Natural Gas Tankless Water Heater, Indoor or Outdoor Convertible...
- 8. APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM,...
- 9. Vancepic Natural Gas Tankless Water Heater Indoor,4.3 GPM | 3-4...
- 10. Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water...
Top 10 40 Gallon Gas Water Heaters Brands on Amazon
Here is the list of top-rated brands that were evaluated by CherryPicks.
- A. O. Smith
- thermomate
- Rheem
- GASLAND
- Amzgachfktch
- MIZUDO
- APUS
- VancEpic
- CAMPLUX ENJOY OUTDOOR LIFE
- VEVOR
Related 40 Gallon Gas Water Heaters Guides
For more personalized 40 Gallon Gas Water Heaters guides, Check those pages,
Capacity
Top 10 40 Gallon Gas Water Heaters Sellers: CPR Seller Rank List
CPR sellers rank is based on CherryPicks-AI bestselling ranking system that helps us analyze each seller's sales trends. The List of top seller ranks is our in-house data, essential for our product ranking to help you make the right shopping choice.
- 1. Woot : 266,742 Yearly Feedback , Avg. Ratings 4.8
- 2. ✅ HomePlumbing ✅ : 16,291 Yearly Feedback , Avg. Ratings 4.8
- 3. eFaucets : 7,127 Yearly Feedback , Avg. Ratings 4.4
- 4. VEMIXO : 3,756 Yearly Feedback , Avg. Ratings 4.1
- 5. Suplander : 3,147 Yearly Feedback , Avg. Ratings 4.0
- 6. Camplux : 2,742 Yearly Feedback , Avg. Ratings 4.7
- 7. Hajoca Richmond : 2,501 Yearly Feedback , Avg. Ratings 4.7
- 8. Voomi Supply : 2,310 Yearly Feedback , Avg. Ratings 4.1
- 9. Gasland : 1,802 Yearly Feedback , Avg. Ratings 4.6
- 10. Data Alchemy : 1,652 Yearly Feedback , Avg. Ratings 3.6
| Rank | Name | Yearly Feedbacks | Avg. Ratings |
|---|---|---|---|
| 🥇 | Woot | 266,742 | 4.8 |
| 🥈 | ✅ HomePlumbing ✅ | 16,291 | 4.8 |
| 🥉 | eFaucets | 7,127 | 4.4 |
| 4 | VEMIXO | 3,756 | 4.1 |
| 5 | Suplander | 3,147 | 4.0 |
| 6 | Camplux | 2,742 | 4.7 |
| 7 | Hajoca Richmond | 2,501 | 4.7 |
| 8 | Voomi Supply | 2,310 | 4.1 |
| 9 | Gasland | 1,802 | 4.6 |
| 10 | Data Alchemy | 1,652 | 3.6 |
[Get] 40 Gallon Gas Water Heaters Deals (✅Exclusively for Prime)
What does "Amazon Fulfilled" Mean?
Amazon Fulfilled refers to products handled by Amazon's logistics, which indicates that the product is stored, packed, and shipped by Amazon from one of its fulfillment centers.
When you order a product that is "Amazon Fulfilled," Amazon takes care of the storage, packing, shipping, and customer service for that product. This often ensures quicker delivery and better customer service compared to products that are not fulfilled by Amazon. It also means that the product is eligible for Amazon's return policy.
What does "Prime" Mean?
"Prime" refers to Amazon Prime Member (Join Amazon Prime Now), which indicates eligibility for Prime benefits. When you see "Prime" next to a product on Amazon, This generally means that if you are an Amazon Prime member, you can get free two-day shipping on that product, and sometimes even same-day or one-day shipping depending on your location.
Prime members also have access to other benefits, including 2-Day Shipping, Exclusive Member Deals, Prime Video, Buy With Prime, Amazon Music, Prime Gaming, and more.
Shop Prime 40 Gallon Gas Water Heaters Deals
What does "Free Shipping" Mean?
"Free Shipping" means that you will not be charged additional fees for the shipping of that product. However, unlike "Prime," which usually guarantees fast two-day shipping, "Free Shipping" doesn't necessarily mean fast shipping.
Sometimes there might be a minimum purchase requirement to qualify for free shipping if you are not a Prime member. For Prime members, the "Free Shipping" usually refers to the free two-day shipping that is one of the benefits of the Prime membership.
Why Should You Trust Us?
Now hundreds and thousands of Rough Plumbing supplies are available on Amazon, Picking the right one is not easy, and that may take a lot of your time, Right? and What is the best 40 Gallon Gas Water Heaters to buy for new October 2026?
CherryPicks’s Methodology for Evaluating 40 Gallon Gas Water Heaters
We developed the CherryRatings-AI system to identify and score reviews and the CherryPicks-AI ranking system that uses TensorFlow framework to generate the best list, It will help us evaluate Rough Plumbing items that sell on Amazon. The score of items is based on over ten parameters such as analyzing customer review content, product reviewing rating statistics, brand reputation evaluation, comparing product price with features, etc, You can visit How We Rank to learn more in detail.
We collected and analyzed 104 of 40 Gallon Gas Water Heaters reviews based on our selection criteria. It helped us shortlist the top qualified and rated 40 Gallon Gas Water Heaters for Rough Plumbing, We found that most customers choose 40 Gallon Gas Water Heaters with an average price of $487.44, and the top brands are VEVOR, CAMPLUX ENJOY OUTDOOR LIFE, GASLAND, Rheem, thermomate, SNDOAS, forimo, A. O. Smith And Bradford White.
Then our expert-level editors reviewed all those quality items and selected the top 30 40 Gallon Gas Water Heaters for you, We have researched hundreds of sellers and picked the top sellers for Rough Plumbing, including Amazon Resale, Woot, ✅ HomePlumbing ✅, eFaucets, VEMIXO, Suplander, Camplux, Hajoca Richmond, Voomi Supply, Gasland, Data Alchemy And forimo. The A.O. Smith GCR-40LP ProMax Plus High Efficiency... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 6 consumers with an average rating of 4.8.
We've helped a lot of satisfied users get the right Tools & Home Improvement product based on their needs, and save lots of time for them to pick 40 Gallon Gas Water Heaters to buy.
Aidan Binnie is a realtor with expertise in home improvement. He is also a writer who lives in Texas with his wife and dogs which he prefers to call members of his family. Aidan would be sharing his knowledge with us on home improvement and tools for that.