Top 30 Tankless Gas Water Heaters on Amazon (Verified You can Buy)
Top 1
Best for Indoor
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for GASLAND
Best for 3 GPM
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 | 118 | ❌ | ❌ | ❌ |
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 2
APUS Tankless Water Heater Natural Gas, Up to 5.43 GPM, Indoor Tankless Water Heater, 120,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display,Space Gray
APUS
AP-AWH-Q16NG
19.29 x 19.29 x 27.59 inches
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 120,000 BTU heating capacity with 5.43 GPM 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!
Top 3
Best for Indoor
Best for High Efficiency
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Takagi
Best for 2 GPM
Best for 5 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
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 4
Best for Rheem
Best for Outdoor
Best for Whole House
Best for Residential
Best for High Efficiency
Best for Rheem
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
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 | - | ❌ | ❌ | ❌ |
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.
Top 5
Best Gas Water Heaters
Best for Rinnai
Best for Noritz
Best for Rinnai
Best for 9 GPM
Best for 11 GPM
NEW 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
Rinnai
RX199iN
30.11 x 18.5 x 30.11 Inches
55.0 Pounds
High (UEF .98)
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,630 | ❌ | ❌ | ❌ |
| EXPRESS DISTRIBUTION | - | ❌ | ❌ | ❌ |
| Voomi Supply | - | ❌ | ❌ | ❌ |
Features
One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 11.1 GPM (7 fixtures at once)
Top 6
Best for LP
Best for Digital
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
Portable Water Heater Propane Tankless - 6L 1.58GPM RV on demand Hot Gas Outdoor Digital Display Water Heater for Camping,Boat,Cabins
RUINOPAR
JSN-F01
11.78 x 6.09 x 11.3 Inches
11.0011 pounds
Ratings for RUINOPAR (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| JAYICHENG | - | ✅ | ✅ | ✅ |
| RUINOPAR | - | ❌ | ❌ | ❌ |
Features
【On Demand Hot Water】Maximum power output 42,000btu/hour, 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. Low water pressure start up, just need 2.5 PSI of water pressure. 1.58 gallons per minute of on-demand hot water. Fully adjustable heat and water flow.
【CSA Approved Safety 】RUINOPAR Tankless Water Heater with CSA Approved Regulator, safe as per Canadian and US Standard.Automatically decrease water pressure between 2.5-145PSI. The anti-freezing drain plug can discharge the residual water to avoid freezing in cold areas or in case of long time no use. High water temperature protection over 167°F. Shut off gas supply automatically under unexpectable flameout.
Top 7
Best Water Heaters
Best for NG
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for 3 GPM
Best for 4 GPM
Best for 5 GPM
Westinghouse Smart Tankless Water Heater Gas Indoor, 7.9 GPM 180,000 BTU Whole Home Natural Gas Heater, WiFi App Control, ±1°F Temperature Stability, Non-Condensing for 3-5 Fixtures
Westinghouse
HW180A0G-NG
17.1 x 17.1 x 26.2 inches
Ratings for Westinghouse (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
【Endless Hot Water for the Whole Home】Enjoy continuous instant hot water for showers, laundry, dishwashing, and daily household use. Delivering up to 7.9 GPM and 180,000 BTU, this whole house tankless water heater comfortably supports 3–5 fixtures simultaneously without sacrificing comfort or water pressure.
【Smart WiFi App Control】Control your indoor tankless water heater anytime through the smartphone app or LED display panel. Easily adjust water temperature, monitor operating status, and enjoy a smarter, more convenient hot water experience for your home.
Top 8
Best Gas Water Heaters
Best for Fogatti
Best for 30 Gallon
Best for 40 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Takagi
Best for FOGATTI
Best for AO Smith
Best for 7 GPM
FOGATTI Natural Gas Tankless Water Heater Indoor - Max 7.5 GPM 170,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 170S Series
FOGATTI
InstaGas Comfort
17.1 x 17.1 x 26.2 inches
Ratings for FOGATTI (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Powerhouse Performance: The FOGATTI tankless water heater takes up a third of the space of traditional tank heaters but delivers 5 times the performance. With a high heating power of 170,000 BTU and a flow rate of 7.5 GPM, it provides endless hot water on demand, perfect for multitasking households
Instant Heating: Unlike traditional tank heaters, this tankless water heater gas delivers instant and endless hot water as water flows through. Whether it’s for showers, sinks, or appliances, even for 3-5 outlet points, it ensures uninterrupted hot water whenever you need it
Top 9
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for 7 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
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.
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 11
Best for Gas Powered
Best for 40 Gallon
Best for 50 Gallon
Best Tankless Water Heaters
Best for Noritz
Best for 7 GPM
Best for 10 GPM
Best for 11 GPM
MIZUDO Natural Gas Tankless Water Heater, 199,000 BTU, Indoor Installation, Max 10.3 GPM, WiFi&APP Control, Non Condensing, High Efficiency for Large Families Residential Whole House
MIZUDO
WCIU-HW199A1G-NG-M0
15.9 x 15.9 x 24.8 inches
55.5 pounds
Ratings for MIZUDO (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Mizudo Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
[Professional 199k BTU Tankless Water Heater]: Experience uninterrupted hot water delivery with 10.3 GPM flow capacity, designed to support large households with 5-7 fixtures simultaneously, providing hot water only when needed, making it an economically smart choice
[Smart WiFi Connectivity for Remote Management]: Control and monitor your gas tankless water heater from anywhere using the dedicated mobile application. Adjust temperature settings, create custom schedules, receive maintenance alerts, and track energy usage through your smartphone
Top 12
Best for Rheem
Best for High Efficiency
Best for Rheem
Best Gas Water Heaters
Best for 50 Gallon
Best for 75 Gallon
Best for 50 Gallon
Best for Takagi
Best for Noritz
Best for Rheem
Best for Rinnai
Rheem RRTGH84DVLN3701171 Rheem RTGH Series 8.4 GPM 157,000 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
Rheem
RTGH-84DVLN-3
9.8 x 17.7 x 23.7 inches
59.88 Pounds
Super High Efficiency
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| MTL Retailers | - | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
Flow rate of 0.4 - 8.4 GPM
Available temperature settings range from 100 to 140F (default setting of 120F)
Top 13
Best for Fogatti
Best for 40 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Takagi
Best for Rinnai
Best for FOGATTI
Best for 4 GPM
Best for 5 GPM
Best for 8 GPM
FOGATTI Natural Gas Tankless Water Heater Outdoor - Max 8.1 GPM 180,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 180S Series, New Upgraded
FOGATTI
FOG-PM18OS
17.1 x 17.1 x 26.2 inches
43.2 pounds
Ratings for FOGATTI (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
Instant Hot Water: Say goodbye to preheating delays! FOGATTI tankless water heater delivers continuous hot water instantly, powered by 180,000 BTU and up to 8.1 GPM flow rate. Whether it’s for showers, sinks, or appliances, even for 3-5 outlet points, it ensures uninterrupted hot water
Built for Outdoor Durability: Designed specifically for outdoor installation, this tankless water heater gas features a remote control panel for convenient indoor operation. The bottom-mounted fan enhances safety, durability, and lifespan by preventing smoke backflow and ensuring stable combustion, making it reliable in all seasons
Top 14
Best for Gas Powered
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
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!
Top 15
Best for Propane Liquid
Best Gas Water Heaters
Best for 30 Gallon
Best for 75 Gallon
Best for Eccotemp
Propane Tankless Water Heater, 4.21GPM 16L Indoor, Constant propane water heater,Instant Hot Propane Gas Water Heater with Multi-Protection
VELPAX
HWRSQ-001
13.8 x 13.8 x 21.7 inches
22.9501 pounds
Ratings for VELPAX (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| DIVACEN | - | ❌ | ❌ | ❌ |
Features
【Tankless Water Heater】– This propane tankless water heater features steady temperature control and multiple safety protections, including a flame failure device, anti-freeze protection, and overheating protection. It operates with just 3.6 PSI of water pressure, with a working pressure range of 3.6 PSI – 116 PSI, delivering up to 4.21 gallons of hot water per minute. With a maximum temperature rise of 65°C(149°F), this unit is designed exclusively for use with propane (LPG).
【Efficient & Energy-Saving】– With a high-performance output of 68,000 BTU per hour, this 4.21 GPM instant propane water heater provides on-demand hot water for 2–3 points of use simultaneously, making it ideal for bathrooms and kitchens. The advanced combustion technology minimizes gas consumption and reduces operational noise for a more efficient and quieter experience.
Top 16
Best for NG
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 | 118 | ❌ | ❌ | ❌ |
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 17
Best Water Heaters
Best for Gas Powered
Best for LP
Best for Indoor
Best for Propane
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Rinnai
Best for Eccotemp
Ranein Propane Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
Ranein
RH8K-LPG-FC-RATING
13.8 x 13.8 x 21.7 inches
18.0 Pounds
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Powerful On-Demand Heating: 80,000 BTU & 3.6 GPM for this tankless water heater propane, supports 2-3 water points simultaneously, delivers endless propane hot water on demand with no waiting.
Precision Temp Control: Gas-water-temperature intelligent dynamic linkage, 95°F-149°F adjustable range, eliminates hot/cold spikes, safe for kids and elders.
Top 18
Best for Rheem
Best for Propane Liquid
Best for Outdoor
Best for Rheem
Best Gas Water Heaters
Best for 50 Gallon
Best for 50 Gallon
Best Tankless Water Heaters
Best for Takagi
Best for Rheem
Best for Rinnai
Best for 3 GPM
Best for 7 GPM
Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater 7.0 GPM, 160,000 BTUs
Rheem
RTG-70XLP-3
9.4 x 13.5 x 20.75 inches
39.25 Pounds
high
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 liquid propane with 160,000 BTUs, this durable tankless unit ensures fast, reliable hot water—even during peak household demand.
Rinnai RXP199iN Condensing Smart Sense Tankless Water Heater
Rinnai
RXP199iN
19.0 x 19.0 x 31.0 inches
58.0 Pounds
High
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| The Portland Group | - | ❌ | ❌ | ❌ |
| eFaucets | 9,630 | ❌ | ❌ | ❌ |
Features
One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 11.1 GPM (7 fixtures at once)
Ranein Natural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
Ranein
RH8K-NG
13.8 x 13.8 x 21.7 inches
18.0 pounds
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
| Woot | 118 | ❌ | ❌ | ❌ |
Features
Powerful On-Demand Heating: 80,000 BTU & 3.6 GPM for this tankless water heater natural gas, supports 2-3 water points simultaneously, delivers endless natural gas hot water on demand with no waiting.
Precision Temp Control: Gas-water-temperature intelligent dynamic linkage, 95°F-149°F adjustable range, eliminates hot/cold spikes, safe for kids and elders.
APUS 190,000 BTU Outdoor Tankless Water Heater, 8.1 GPM Natural Gas Instant Hot Water Heater with WiFi & Remote Control, High Efficiency for Supports 5 Outlets
APUS
AP-AWH-W26NG
6.54 x 6.54 x 22.48 Inches
42.5 pounds
High
Ratings for APUS (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| APUS WATER EQUIPMENT | - | ❌ | ❌ | ❌ |
Features
Whole-Home Hot Water: This high-efficiency gas tankless water heater delivers 190,000 BTU and 8.1 gallons per minute of instant hot water, making it the perfect on demand water heater for whole-house use. Our advanced tankless water heater gas system effortlessly supplies 3 showers + 2 faucets simultaneously, while the ultra-low 0.79 GPM minimum flow ensures this hot water heater performs reliably even with weak water pressure
Smart Temperature Control: Remotely adjust your tankless hot water heater via App (Works with Tuya APP) or wired controller (95°F–149°F). Enjoy precise on-demand heating with a stable ±1°F temperature accuracy
Natural Gas Tankless Water Heater,4.21GPM 16L Indoor,Instant Hot Gas water heater,Constant Natural Water Heater with Multi-Protection
VELPAX
HWRSQ-002
13.8 x 13.8 x 21.7 Inches
Ratings for VELPAX (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| DIVACEN | - | ❌ | ❌ | ❌ |
Features
【Tankless Water Heater】– This natural gas tankless water heater features steady temperature control and multiple safety protections, including a flame failure device, anti-freeze protection, and overheating protection. It operates with just 3.6 PSI of water pressure, delivering up to 4.21 gallons of hot water per minute. With a maximum temperature rise of 65°C(149°F), this unit is designed exclusively for use with Natural Gas（LNG).
【Efficient & Energy-Saving】– With a high-performance output of 68,000 BTU per hour, this 4.21 GPM instant natural gas water heater provides on-demand hot water for 2–3 points of use simultaneously, making it ideal for bathrooms and kitchens. The advanced combustion technology reduces operational noise for a more efficient and quieter experience.
Top 23
Best for Rinnai
Best for Inline
Best for Rinnai
Best Tankless Water Heaters
Best for Rinnai
Best for 9 GPM
Best for 10 GPM
NEW Rinnai RX160iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 9 GPM, 160,000 BTU
Rinnai
RX160iN
19.0 x 19.0 x 31.0 Inches
54.0 Pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,630 | ❌ | ❌ | ❌ |
| Standard Plumbing Supply | - | ❌ | ❌ | ❌ |
Features
One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 9 GPM (6 fixtures at once)
Top 24
Best for Gas Powered
Best for Wall
Best for 60 Gallon
Best for Eccotemp
Best for 4 GPM
Best for 9 GPM
Best for 11 GPM
Propane Gas Tankless Water Heater, Indoor Max 4.3 GPM, 100,000 BTU On Demand Instant Hot Water Heater Propane Gas with LED Temperature Control Panel, 1/2" NPT Connector Size, Gray
LiberLive
HKRV-HR2110
14.2 x 14.2 x 22.1 Inches
Ratings for LiberLive (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Woot | 118 | ❌ | ❌ | ❌ |
Features
Powerful On-Demand Heating – This tankless water heater gas delivers 100,000 BTU & 4.3 GPM, supporting 3–4 water points simultaneously (shower + kitchen sink + bar sink + more). Enjoy endless tankless hot water heater performance with no waiting – perfect for daily household use
Precision Temperature Stability – Unlike conventional gas water heater units, our propane water heater eliminates sudden hot/cold spikes. Adjustable range (95°F–149°F) ensures consistent warmth, safe for infants, kids, and elders – no more unexpected cold blasts
SNDOAS Tankless Hot Water Heater Natural Gas, 4.23 GPM 16L Tankless Water Heater Indoor Use,85,300 BTU Forced Exhaust Instant Hot Water Heater,LED Display,Whole House, Multi-Protection,Black
SNDOAS
IF.JSQ25-B13NA
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
【Safe Forced Exhaust & Reliable Natural Gas Operation】Designed with a forced exhaust system, this indoor tankless gas water heater safely vents combustion gases outside, preventing CO buildup. It runs on natural gas only, ensuring consistent performance and peace of mind for your family
Ranein Natural Gas Tankless Water Heater, Indoor Max 8.5 GPM, 190,000 BTU Instant Hot Water Heater
Ranein
RH19K-NG
15.08 x 15.08 x 24.25 inches
42.0 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 Tanked
Best for Gas Powered
Best for Indoor
Best for Whole House
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
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 | - | ❌ | ❌ | ❌ |
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
CAMPLUX Climatech 7 Indoor Natural Gas Tankless Water Heater 4.22 GPM (Up to 5 GPM) 102,000 BTU(Real Data No Exaggeration), CSA Certified Gas Tankless Water Heater Indoor for Whole House, 2–4 Outlets
CAMPLUX ENJOY OUTDOOR LIFE
CA422WNG
6.9 x 6.9 x 24.2 Inches
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
This natural gas tankless water heater indoor delivers up to 5 GPM and 102,000 BTU as a tankless gas hot water heater for 2–4 fixtures(Mobile Home, Tiny House, Apartment, Cabin). ±1°F control with flow sensor adjusting 20,000 times per second.
Unique Tempered Glass Smart diagnostic LED touchscreen in this gas tankless water heater indoor shows real-time flow, fan, and flame status for easy troubleshooting.
Propane Tankless Water Heater, 4.21GPM 16L Indoor,Constant propane water heater,Instant Hot Propane Gas Water Heater with Fahrenheit Digital Display,Multi-Protection
forimo
CT1412-HWRSQ
13.8 x 13.8 x 21.7 inches
21.87 Pounds
Ratings for forimo (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| forimo | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
【Tankless Water Heater】- Propane Tankless Water Heater with Steady Temperature Control & Multiple Safety Protections (Flame Failure Device, Overheating Protection). Only 3.6PSI water pressure required, outputs 4.21 gallons of hot water per minute, maximum temperature raise up to 75℃. Applicable exclusively to Propane (LPG).
【Efficient & Energy Saving】- The 4.21 GPM Instant Propane 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 Propane Water Heater’s heat exchanger and main burner are designed with advanced combustion technology, which effectively decreases gas consumption and reduces burning noise.
Top 30
Best Water Heaters
Best Gas Water Heaters
Best for 30 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Aokawa Portable Propane Tankless Water Heater, 1.78 GPM On-Demand Hot Water Heater with Shower Head, Outdoor Camping RV Cabin Use, Propane Gas Instant Hot Water, Overheat & Anti-Freeze Protection
Aokawa
AP-6L-US01
11.8 x 11.8 x 15.75 Inches
Ratings for Aokawa (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Aokawa US | - | ❌ | ❌ | ❌ |
Features
Instant & Endless Hot Water: Enjoy instant, continuous hot water with 1.78 GPM . Designed for on-demand heating, perfect for camping, RV travel, cabins, pet showers, tiny homes, and outdoor use. Never wait for hot water again.
Safe & Reliable Propane Heating System: Built with multiple protection systems: overheat protection, anti-freeze drain plug, flame-out protection, and low water pressure activation—ensuring safe use in outdoor environments.
Top 10 Tankless Gas Water Heaters - Verified to Buy (September 2026)
- 1. Tankless Water Heater, Novieex On Demand Water Heater Natural Gas,...
- 2. APUS Tankless Water Heater Natural Gas, Up to 5.43 GPM,...
- 3. ThermoMate CZ422NG Natural Gas Tankless Water Heater, Up to 5...
- 4. Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water...
- 5. NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane...
- 6. Portable Water Heater Propane Tankless - 6L 1.58GPM RV on...
- 7. Westinghouse Smart Tankless Water Heater Gas Indoor, 7.9 GPM 180,000...
- 8. FOGATTI Natural Gas Tankless Water Heater Indoor - Max 7.5...
- 9. APUS Natural Gas Tankless Water Heater 140,000 BTU Indoor Installation...
- 10. Ranein Natural Gas Tankless Water Heater, Indoor Max 4.3 GPM,...
Top 10 Tankless Gas Water Heaters Brands on Amazon
Here is the list of top-rated brands that were evaluated by CherryPicks.
- NOVIEEX
- APUS
- thermomate
- Rheem
- Rinnai
- RUINOPAR
- Westinghouse
- FOGATTI
- Ranein
- MIZUDO
Related Tankless Gas Water Heaters Guides
For more personalized Tankless Gas Water Heaters guides, Check those pages,
Feature Topics
Top 10 Tankless 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 : 264,925 Yearly Feedback , Avg. Ratings 4.8
- 2. eFaucets : 7,050 Yearly Feedback , Avg. Ratings 4.4
- 3. Camplux : 2,734 Yearly Feedback , Avg. Ratings 4.7
- 4. Voomi Supply : 2,260 Yearly Feedback , Avg. Ratings 4.1
- 5. The Portland Group : 951 Yearly Feedback , Avg. Ratings 4.9
- 6. forimo : 927 Yearly Feedback , Avg. Ratings 4.4
- 7. MTL Retailers : 498 Yearly Feedback , Avg. Ratings 4.1
- 8. Standard Plumbing Supply : 415 Yearly Feedback , Avg. Ratings 3.6
- 9. Mizudo Home Comfort Direct : 401 Yearly Feedback , Avg. Ratings 4.7
- 10. Amazon.com : 386 Yearly Feedback , Avg. Ratings 4.7
| Rank | Name | Yearly Feedbacks | Avg. Ratings |
|---|---|---|---|
| 🥇 | Woot | 264,925 | 4.8 |
| 🥈 | eFaucets | 7,050 | 4.4 |
| 🥉 | Camplux | 2,734 | 4.7 |
| 4 | Voomi Supply | 2,260 | 4.1 |
| 5 | The Portland Group | 951 | 4.9 |
| 6 | forimo | 927 | 4.4 |
| 7 | MTL Retailers | 498 | 4.1 |
| 8 | Standard Plumbing Supply | 415 | 3.6 |
| 9 | Mizudo Home Comfort Direct | 401 | 4.7 |
| 10 | Amazon.com | 386 | 4.7 |
[Get] Tankless 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 Tankless 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 Tankless Gas Water Heaters to buy for new September 2026?
CherryPicks’s Methodology for Evaluating Tankless 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 306 of Tankless Gas Water Heaters reviews based on our selection criteria. It helped us shortlist the top qualified and rated Tankless Gas Water Heaters for Rough Plumbing, We found that most customers choose Tankless Gas Water Heaters with an average price of $620.98, and the top brands are VEVOR, Westinghouse, CAMPLUX ENJOY OUTDOOR LIFE, Rheem, thermomate, SNDOAS, forimo, Rinnai And FOGATTI.
Then our expert-level editors reviewed all those quality items and selected the top 30 Tankless Gas Water Heaters for you, We have researched hundreds of sellers and picked the top sellers for Rough Plumbing, including Amazon Resale, Woot, eFaucets, Camplux, Voomi Supply, The Portland Group, forimo, MTL Retailers, Standard Plumbing Supply, Mizudo Home Comfort Direct, Amazon.com And ThermoMate Official. The Tankless Water Heater, Novieex On Demand Water ... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 63 consumers with an average rating of 4.0.
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 Tankless Gas Water Heaters to buy.
Donald K. Bradley, Dokey for short has over 10 years of experience in the art sector teaching and setting standards for others in his local art community. He also doubles as a writer and using these two skills, he would be guiding you on the best tools for the job.