10 Best Water Gas Heater In The Us

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Last Updated - November 24, 2024

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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

8.0 Easy installation

8.0 Temperature control
Main highlights

Smart, Efficient Design: This water heater's modern design includes an easy-to-use interface, Quick Flush feature for simplified flushing, as well as a super-high energy efficiency factor of UEF .98; See Controlr module for WiFi control (not included)
Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to find a qualified technician to install your tankless water heater, and use the Rinnai Central App for help with setup, service & troubleshooting; We do not recommend installing a water heater without a technician
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)
Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater size for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region
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9.9

Exceptional

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Value for Money

2

Rheem
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 Temperature control

8.9 Easy installation

8.0 Tech Support

Why we love it

Endless hot water

Lower energy costs

Saves water
Main highlights

Key Features
Versatile flow rate (0.4-9.5 GPM), adjustable temperature (100-140F), and electric ignition. Includes robust warranties: 1-year labor, 15-year heat exchanger, 5-year parts.

Ideal Use Cases
Perfect for homes needing consistent hot water supply at variable rates, from low-flow sinks to high-demand showers, with energy-efficient temperature control.

Customer Praise
Most reviews highlight its reliability and efficiency in providing consistent hot water, with special appreciation for the comprehensive warranty coverage.
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9.8

Exceptional

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3

FOGATTI
FOGATTI Natural Gas Tankless Water Heater, Indoor 5.1 GPM, 120,000 BTU Instant Hot Water Heater, InstaGas Classic 120 Series

9.9 worth the money

8.9 Easy installation

8.7 materials Quality

Why we love it

Compact size yet delivers high performance.

Fast and endless hot water supply.

Stable and precise temperature control.
Main highlights

Stable Temperature Control: The built-in chip adjusts heating power 1,000 times per second, maintaining water temperature within ±2°F for a consistently comfortable experience
Safety & Durability: FOGATTI natural gas tankless water heater has been CSA certified with advanced safety features, including dry combustion protection, overheat protection, Anti-Freeze protection, flame failure protection, and high water pressure protection for peace of mind
Energy Efficient: Featuring a copper heat exchanger and micro-flame technology with negative pressure design, this unit reduces gas consumption and noise, saving you on energy bills while ensuring quiet operation
Endless Hot Water: FOGATTI tankless water heater gas delivers a high flow rate of 5.1GPM with 120,000 BTU heating power, providing reliable hot water for 3-4 locations simultaneously
Easy Installation: With a 3-inch OD and 3/4" NPT, the venting and piping dimensions for FOGATTI gas tankless water heater are compatible with most households. Professional installation is recommended for best performance
Compact Design: Measuring 22.76” H x 14.57” W x 7.0” D, it saves over 50% more space compared to traditional tank heaters. you can install it in most corners of your home
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9.7

Exceptional

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4

MIZUDO
Natural Gas Tankless Water Heater MIZUDO 5.1 GPM, 120,000 BTU, Outdoor Installation Only, Instant Hot Water Heater, CSA Certified

9.5 Easy installation

9.1 Temperature control

8.2 Tech Support
Main highlights

Precise Water Temperature Control: With the cooperation of chips, water flow sensors, and gas valve components, the water flow and temperature are intelligently adjusted, and the water temperature is controlled to fluctuate stably within ±1℉.
Multi-Point Water Supply: If you want multiple points of water supply in your home, a 120,000BTU instant water heater can easily achieve this. It is not limited to water supply in a single scene, but can simultaneously meet the water needs of bathrooms, kitchens, and laundry rooms in multiple scenes.
Easy to Install: The product installation interface is a universal 3/4’’ NPT, which adapts to the standard interface size of most households. It can be installed without additional adapters, which is worry-free and convenient.
Designed for Outdoor Use: Mizudo outdoor gas water heater has a wind pressure resistance of 260PA, has IPX4 waterproof protection on the surface, and can operate at low temperatures. It has the ability to adapt to extreme outdoor weather in many aspects.
Continous Hot Water: Unlike tank water heaters, tankless water heaters do not need to wait for energy to be restored. They only need to flow through the heat exchanger to achieve endless hot water. Allow you and your family to enjoy a comfortable bath at any time.
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9.6

Exceptional

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5

CAMPLUX ENJOY OUTDOOR LIFE
CAMPLUX 4.22 GPM Tankless Water Heater Gas, 102,000 BTU Propane Tankless Water Heaters, On Demand Propane Hot Water Heater Indoor, CX422, White

14% Off
Main highlights

【Temperature Control】The CAMPLUX indoor tankless water heater has sophisticated water flow sensors and a smart chip with 1,000s calculation, which ensures consistent hot waterwith variations of only ±1℉, making bathing enjoyable
【Easy Installation】CAMPLUX CX422 propane water heater complies with national standard and has a UL-approved plug and 1/2 NPT interfaces for both gas and water. Additonal purchase with standard gas regulator and 1/2" NPT Female to 3/8" Male adaptor to connects 20 lb propane tank directly. Fits with standard stainless steel 3" vent pipe
【Compact Design】 When compared to tank water heaters, the CX422 gas tankless water heater conserves almost 200% of the available area
【Anti-Freeze Protection】With 4 heating modules rated at 100W total, the CAMPLUX has an【Compact Design】 When compared to tank water heaters, the CX422 gas tankless water heater conserves almost 200% of the available area anti-freeze feature that kicks in at 39°F in order to prevent the heat exchanger from freezing
【4.22 GPM Gas Water Heater】It is ideal for compact houses, mobile homes, and apartments. These gas tankless water heaters produce 4.22 GPM of endless hot water on demand for 2-3 water points
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9.3

Excellent

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6

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

8.0 Temperature control

8.0 Tech Support

8.0 Easy installation
Main highlights

Save on Energy Costs – High Efficient Water Heater only runs when needed
Save Water– Water Saving Setting saves up to 1,100 gallons of water per year
Leak Protection – LeakGuard Leak Detection & Prevention protects your home from water damage that detects any internal leak, both large or small
Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
Continuous Hot Water & Comfort When Needed – Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
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9.2

Excellent

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7

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

9.5 worth the money

9.1 Easy installation

8.7 Long life
Main highlights

Upgrade features: Four Seasons Function: Automatically adjust the water temperature output based on the seasonal water temperature changes. Kitchen Function: Default water output temperature is 100°F, suitable for kitchen use. Bathtub Function: Adjustable water output quantity with a reminder when the set output quantity is reached, catering to various environmental needs.
Save Money: The kit already includes the exhaust pipe, so you don't need to spend extra money on purchasing it separately. With an oxygen-free copper water tank, it reduces heat loss and lowers energy consumption. Applied with standard 1/2" NPT water fitting and gas inlet.
Recommendation: We strongly advise that all installations of the device adhere to local building and plumbing regulations at the installation location, and should be carried out by licensed professionals. Not recommended for areas over 2,000 feet.
Performance: The on-demand tankless water heater boasts a heating capacity of 100,000 BTU and a hot water flow rate of 4.3 gallons per minute (GPM). It can provide continuous hot water for 2-3 water supply points, making it sufficient to meet the hot water needs of a household's bathroom, kitchen, and bar area.
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.
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9.1

Excellent

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8

MAREY
Marey Tankless Water Heater Gas, 7.5 GPM, 170,000 BTU, Natural Gas, CSA Certified, Indoor

19% Off

8.0 Easy installation

8.0 Temperature control

8.0 Tech Support

Why we love it

CSA certified for safety

LED touch screen for ease of use

Oxygen free copper heat exchanger for efficiency
Main highlights

Why Choose Marey: Marey offers water heating solutions for every budget and lifestyle. Since 1955, we’ve been providing exceptional and innovative tankless water heaters, meeting your every need.
We recommend installation be performed by a professional for safety and compliance.
This natural gas tankless water heater comes with a 5 years limited warranty by manufacturer.
The 24CSA tankless water heater maintains a 82% energy efficiency level.
Save Space and Installation-time: Free up storage space with a compact wall- mounted design. Simplify installation with its standard 3” size exhaust venting. (Note: Not recommended for elevations above 2,000 ft.)
Full-house Endless Hot Water: Enjoy unlimited hot water with up to 3-4 use points running simultaneously, fulfilling all household or light-commercial needs.
Efficient Performance, Smart Design: Our advanced technology ensures high efficiency and long-lasting durability, boasting a powerful 170,000 BTU capacity. Its user-friendly display allows for dynamic power adjustment tailored to your specific needs.
Certified Quality: CSA certified in the USA and Canada, guaranteeing top safety, quality, and durability standards. Multiple security layers, including overheat, flame failure, and anti-freezing features, ensure worry-free operation.
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9.0

Excellent

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9

Rheem
Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater, 7.0 GPM, Gray
Main highlights

Save on Energy Costs – High Efficient Water Heater only runs when needed
Save Water– Water Saving Setting saves up to 1,100 gallons of water per year
Save Space - New smaller size, 19%, and reduced weight by 22% compared to the previous model for easy installation and space savings
Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
Continuous Hot Water & Comfort When Needed – Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
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8.9

Very Good

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10

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

9.3 Efficient Energy Use

8.7 worth the money

8.0 Temperature control

Why we love it

Endless hot water for multiple appliances simultaneously.

Energy-efficient, only heats water when needed.

Compact design saves space in your home.
Main highlights

Endless Hot Water Availability
Our tankless hot water heaters offer unlimited hot water flow with a compact, durable design that fits your home and lifestyle.

Ideal for Energy and Space Efficiency
This tankless gas water heater is perfect for conserving energy and space, with flexible placement options using multiple venting configurations.

High Performance and Reliability
Customers frequently praise the high-performance flow rate and reliability, providing a constant stream of hot water to multiple appliances simultaneously.
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8.6

Very Good

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10 Best Water Gas Heater In The Us

1

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

2

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

Why we love it

3

FOGATTI Natural Gas Tankless Water Heater, Indoor 5.1 GPM, 120,000 BTU Instant Hot Water Heater, InstaGas Classic 120 Series

Why we love it

4

Natural Gas Tankless Water Heater MIZUDO 5.1 GPM, 120,000 BTU, Outdoor Installation Only, Instant Hot Water Heater, CSA Certified

5

CAMPLUX 4.22 GPM Tankless Water Heater Gas, 102,000 BTU Propane Tankless Water Heaters, On Demand Propane Hot Water Heater Indoor, CX422, White

6

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

7

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

8

Marey Tankless Water Heater Gas, 7.5 GPM, 170,000 BTU, Natural Gas, CSA Certified, Indoor

Why we love it

9

Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater, 7.0 GPM, Gray

10

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

Why we love it

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