10 Best natural gas tankless water heaters of 2025

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Rheem
Rheem RTGH-95DVLN-3 RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
Main highlights

High Flow Rate and Temperature Control
Offers 0.4 - 9.5 GPM with adjustable temperatures from 100 to 140F.

Ideal for Cold Climates
Performs efficiently even when inlet water temperature is low.

Energy Efficiency Praised by Users
Customers report significant gas bill savings and quick heating performance.
9.8

Exceptional

Our Rating

9.3
Temperature control

8.9
Easy installation

8.0
Tech Support
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Value for Money

2

Rinnai
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
Main highlights

Versatile Installation
Install indoors or outdoors with Smart Sense gas control.

Ideal for Large Households
Supports up to 7 fixtures simultaneously with 11.1 GPM.

Endless Hot Water
Customers praise its ability to provide continuous hot water.
9.7

Exceptional

Our Rating

8.0
Easy installation

8.0
Temperature control
3

Ranein
Ranein Natural Gas Tankless Water Heater with Vent Pipe, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot Water Heater
Main highlights

Continuous_Hot_Water_Availability
Provides up to 3.6 GPM, supporting multiple outlets simultaneously.

Ideal_for_Multi-Point_Households
Perfect for homes needing hot water in bathrooms, kitchens, and bars.

Ease_of_Installation_Praised
Customers love the straightforward installation and setup process.
9.6

Exceptional

Our Rating

9.5
worth the money

9.1
Easy installation

8.7
Long life
4

forimo
Tankless Water Heater Natural Gas,4.74GPM 18L Indoor,Instant Hot Gas Water Heater,Constant Natural Water Heater with Fahrenheit Digital Display,Multi-Protection (Black)
Main highlights

Instant Hot Water Supply
Provides 4.74 gallons per minute with steady temperature control.

Versatile Indoor Use
Ideal for homes, small cabins, and remote apartments.

Highly Rated Performance
Customers praise its instant heating and reliability.
9.3

Excellent

Our Rating

9.7
Easy installation

8.9
worth the money

8.9
Temperature control
5

Orbek
Natural 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
Main highlights

Continuous Hot Water Supply
Tankless design ensures uninterrupted hot water on demand, eliminating wait times and energy wastage.

Space-Saving Solution
Ideal for small homes or off-grid situations, maximizing space efficiency.

Highly Praised Safety Features
Customers appreciate its anti-scalding and leak protection, enhancing user confidence.
9.1

Excellent

Our Rating

8.2
Tech Support

8.0
Easy installation

8.0
worth the money
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6

Rinnai
Rinnai RUCS65IN Tankless Hot Water Heater, 6.5 GPM, Natural Gas, Indoor Installation
Main highlights

Unlimited Hot Water Flow
Enjoy endless hot water with a compact, durable design.

Ideal for Multiple Appliances
Serves up to 5 appliances simultaneously with 6.5 GPM flow.

Ease of Maintenance
Easy part replacement and maintenance praised by customers.
8.8

Very Good

Our Rating

9.3
Efficient Energy Use

8.7
worth the money

8.0
Temperature control
7

thermomate

ThermoMate 102,000 BTU 4.7 GPM Natural Gas Tankless Water Heater, High Efficiency Instant On-Demand Hot Water for Whole House Use, Indoor Residential Water Heater with Multi-Point Simultaneous Heating
8.7

Very Good

Our Rating
8

Rinnai
Rinnai V75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation

21% Off
Main highlights

Key Features
Unlimited hot water with up to 7.5 GPM flow rate, energy and space-efficient design, enhanced scale detection for durability.

Ideal Use Cases
Perfect for homes with high hot water demand, serving up to 5 appliances simultaneously without compromising water pressure.

Customer Praise
Most reviews highlight the heater`s reliability, consistent hot water delivery, and energy savings as top benefits.
8.6

Very Good

Our Rating

8.7
Temperature control

8.7
Tech Support

8.7
Remote Control
9

FOGATTI
FOGATTI Natural Gas Tankless Water Heater - Outdoor Installation Up to 8.1 GPM, Gray Instant Hot Water Heater - Instagas Comfort 180S Series
Main highlights

Unlimited Hot Water
The tankless design offers endless hot water without preheating.

Whole Family Use
Ideal for homes with 3-5 outlets, ensuring ample supply.

Excellent Customer Service
Praised for quick, effective support and problem resolution.
8.5

Good

Our Rating

8.4
Temperature control

8.2
Easy installation

8.0
Tech Support
10

Rheem
Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater, 7.0 GPM
Main highlights

Continuous Hot Water
Provides enough hot water for your entire house, even with multiple applications like a shower and dishwasher.

Ideal for Large Households
Perfect for families needing simultaneous hot water access without interruption.

Energy Efficiency Praised
High efficiency only runs when needed, saving energy and costs.
8.4

Good

Our Rating

8.0
Temperature control

8.0
Tech Support

8.0
Easy installation

10 Best natural gas tankless water heaters of 2025

1

Rheem RTGH-95DVLN-3 RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel

9.3

8.9

8.0

2

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

8.0

8.0

3

Ranein Natural Gas Tankless Water Heater with Vent Pipe, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot Water Heater

9.5

9.1

8.7

4

Tankless Water Heater Natural Gas,4.74GPM 18L Indoor,Instant Hot Gas Water Heater,Constant Natural Water Heater with Fahrenheit Digital Display,Multi-Protection (Black)

9.7

8.9

8.9

5

Natural 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

8.2

8.0

8.0

6

Rinnai RUCS65IN Tankless Hot Water Heater, 6.5 GPM, Natural Gas, Indoor Installation

9.3

8.7

8.0

7

ThermoMate 102,000 BTU 4.7 GPM Natural Gas Tankless Water Heater, High Efficiency Instant On-Demand Hot Water for Whole House Use, Indoor Residential Water Heater with Multi-Point Simultaneous Heating

8

Rinnai V75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation

8.7

8.7

8.7

9

FOGATTI Natural Gas Tankless Water Heater - Outdoor Installation Up to 8.1 GPM, Gray Instant Hot Water Heater - Instagas Comfort 180S Series

8.4

8.2

8.0

10

Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater, 7.0 GPM

8.0

8.0

8.0

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