Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
Advertising Disclosure
9 Best tankless gas water heaters of 2025
Save up to 23% off
Best Choice1
Clicked 1,148 times in the last monthRinnaiNEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU
Key specs-
special features:Indoor/outdoor install
-
maximum flow rate:11.1 GPM
-
maximum temperature:N/A
-
voltage:N/A
-
heat output:N/A
9.9Exceptional
Our Rating
-
-
Powerful technology We scan thousands of products and stores, analyzing reviews to find what matters most to users like you
Careful review Our team ensures quality, value, and fit based on real user feedback
Trusted insights AI and human analysis guide your decisions, reflecting real user prioritiesReal users impact
Thousands of users trust our site daily
- Based on millions of stores and reviews
- Shoppers influence our rankings
Analyzing top stores
Value for Money2
RheemRheem RTGH-95DVLN-3 RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
Key specs-
special features:Electric ignition
-
maximum flow rate:0.4 - 9.5 GPM
-
maximum temperature:140F
-
voltage:N/A
-
heat output:N/A
9.8Exceptional
Our Rating
-
3
CAMPLUX ENJOY OUTDOOR LIFECAMPLUX Climatech 7 Tankless Water Heater Gas Indoor 6.86 GPM, 170,000 BTU On Demand Instant Tankless Hot Water Heater Natural Gas, Indoor Installation, White, CA686W, Real Parameters, No False
Key specs-
special features:Dry Combustion Protection
-
maximum flow rate:6.86 GPM
-
maximum temperature:149 Degrees Fahrenheit
-
voltage:120 Volts
-
heat output:170000 BTU
9.6Exceptional
-
4
forimoTankless Water Heater Natural Gas,4.74GPM 18L Indoor,Instant Hot Gas Water Heater,Constant Natural Water Heater with Fahrenheit Digital Display,Multi-Protection (Black)
Key specs-
special features:Steady Temperature Control
-
maximum flow rate:4.74 GPM
-
maximum temperature:167 F
-
voltage:N/A
-
heat output:68000 BTU/hour
9.3Excellent
Our Rating
-
5
RaneinRanein Natural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
Key specs-
special features:Dry Combustion Protection, Flame Failure Protection
-
maximum flow rate:3.6 Gallons Per Minute
-
maximum temperature:149 Degrees Fahrenheit
-
voltage:120 Volts AC
-
heat output:80,000 BTU
9.2Excellent
-
-
See Today’s Deals & Prices
6
RheemRheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater, 9.5 GPM
23% OffKey specs-
special features:Leak Detection & Prevention
-
maximum flow rate:9.5 Gallons Per Minute
-
maximum temperature:140 Degrees Fahrenheit
-
voltage:N/A
-
heat output:N/A
9.1Excellent
Our Rating
-
7
RheemRheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater, 7.0 GPM, Gray
Key specs-
special features:Continuous Hot Water
-
maximum flow rate:7 Gallons Per Minute
-
maximum temperature:140 Degrees Fahrenheit
-
voltage:N/A
-
heat output:N/A
9.0Excellent
-
8
FOGATTIFOGATTI Natural Gas Tankless Water Heater Indoor - Up to 5.1 GPM 120,000 BTU Instant Hot CSA Certified Compact Design Tankless Water Heater for 2-4 Outlet Points - Instagas Comfort 120S Series
15% OffKey specs-
special features:Multi-Point Hot Water Supply
-
maximum flow rate:5.1 GPM
-
maximum temperature:N/A
-
voltage:120 Volts AC
-
heat output:N/A
8.9Very Good
-
9
OrbekNatural Gas Tankless Water Heater - ORBEK 100,000 BTU Up to 4.3 GPM Indoor Installation - CSA Certified On-Demand Instant Hot Water Heater 3/4" NPT Connector Size
Key specs-
special features:Anti-scalding, anti-freeze protection
-
maximum flow rate:N/A
-
maximum temperature:N/A
-
voltage:120 Volts AC
-
heat output:N/A
8.7Very Good
Our Rating
-
