November 3, 2025

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10 Best rinnai tankless water heaters of 2025

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1

Clicked 417 times in the last month

Rinnai
Rinnai CX199iN Condensing Smart Sense Commercial Natural Gas or Propane Tankless Water Heater, 199,000 BTU, 11.1 GPM
Main highlights

Super High Efficiency 96
Achieve significant energy savings with a 96% efficiency rating, perfect for eco-conscious households.

Indoor Outdoor Versatility
Ideal for both indoor and outdoor installations, offering flexible placement options.

Smart Connect App Praise
Highly praised for its user-friendly app, simplifying setup and troubleshooting.
9.8

Exceptional

Our Rating
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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.
Key specs
- special features:Indoor/outdoor install
- maximum flow rate:11.1 GPM
- heat output:N/A
- wattage:N/A
- maximum temperature:N/A
9.7

Exceptional

Our Rating

8.0
Easy installation

8.0
Temperature control
3

Rinnai
Rinnai V53DeP Propane Tankless Water Heater, 5.3 GPM, Outdoor Installation

40% Off
Main highlights

Unlimited Hot Water Supply
Enjoy endless hot water with a compact, durable design, ideal for any home.

Ideal for Multi-Appliance Homes
Perfect for homes needing simultaneous hot water for up to four appliances.

Highly Efficient Energy Use
Praised for energy efficiency, only heating water as needed to conserve energy.
Key specs
- special features:Endless Hot Water
- maximum flow rate:5.3 GPM
- heat output:81 Kilowatts
- wattage:N/A
- maximum temperature:N/A
9.5

Excellent

Our Rating

9.1
worth the money

8.7
Easy installation

8.2
Temperature control
4

Rinnai
Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation
Main highlights

Compact and Powerful Design
The Rinnai RL75IN delivers up to 7.5 GPM, providing endless hot water in a compact size suitable for various spaces.

Ideal for Multi-Fixture Use
Perfect for homes needing simultaneous hot water for multiple showers, laundry, and dishwashing with its high flow rate.

Highly Reliable Performance
Customers praise its reliability and efficiency, noting significant energy savings and consistent hot water supply.
9.4

Excellent

Our Rating

8.7
lasts a long time

8.7
Tech Support

8.4
worth the money
5

Rinnai

Rinnai RE199eP Non-Condensing Propane Tankless Water Heater, Up to 9.8 GPM, Outdoor Installation, 199,000 BTU
9.2

Excellent

Our Rating

9.5
Thermal power

8.9
lasts a long time

8.7
Easy installation
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6

Rinnai
Rinnai RE140iP Non-Condensing Propane Tankless Water Heater, Up to 5.3 GPM, Indoor Installation, 140,000 BTU
Main highlights

Energy Efficient Design
Improved tankless hot water heater only heats when necessary, conserving energy. LED screen provides service reminders and error codes.

Compact and Powerful
Ideal for homes needing up to 5 fixtures at once. Compact size fits various spaces, providing up to 5.3 GPM.

Ease of Installation
Customers appreciate the easy installation process, especially when following the manual and using recommended Rinnai exhaust pipes.
Key specs
- special features:LED Display
- maximum flow rate:5.3 GPM
- heat output:N/A
- wattage:140000 watts
- maximum temperature:N/A
8.9

Very Good

Our Rating

9.3
Efficient Energy Use

9.1
Easy installation

9.1
worth the money
7

Rinnai
Rinnai RUCS75iN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation

22% Off
Main highlights

Endless Hot Water Flow
Our tankless hot water heaters let you enjoy unlimited hot water flow throughout the house with a compact and durable design.

Ideal for Large Families
Capable of serving up to 6 appliances at once, making it perfect for households with high hot water demands.

Consistent Hot Water Supply
Customers consistently praise the unit for providing endless hot water, even when multiple showers and appliances are running simultaneously.
Key specs
- special features:Endless Hot Water
- maximum flow rate:7.5 Gallons Per Minute
- heat output:N/A
- wattage:N/A
- maximum temperature:N/A
8.6

Very Good

Our Rating

9.9
worth the money

8.9
Efficient Energy Use

8.7
Easy installation
8

Rheem
Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater, 9.5 GPM

25% Off
Main highlights

Continuous Hot Water Supply
Provides enough hot water for your entire house, even with multiple applications running.

Ideal for Large Families
Perfect for homes needing simultaneous hot water for showers and dishwashers.

Energy Efficiency Praised
Highly efficient, only runs when needed, saving on energy costs.
Key specs
- special features:Leak Detection & Prevention
- maximum flow rate:9.5 Gallons Per Minute
- heat output:N/A
- wattage:N/A
- maximum temperature:140 Degrees Fahrenheit
8.5

Good

Our Rating

8.0
Temperature control

8.0
Tech Support

8.0
Easy installation
9

Rinnai
Rinnai REP199iN Smart-Circ Non-Condensing Natural Gas Tankless Water Heater with Built-In Recirculation Pump, Up to 7.9 GPM, Indoor Installation, 199,000 BTU
Main highlights

Smart-Circ Energy Efficiency
The Smart-Circ Intelligent Recirculation technology learns your water use patterns and schedules pump and recirculation for optimal energy efficiency and convenience.

Compact Yet Powerful
Ideal for homes needing a compact solution, this tankless gas water heater can provide up to 7.6 GPM, supporting 6 fixtures simultaneously.

Easy DIY Installation
Customers frequently praise the ease of self-installation, especially for those replacing an older unit, with recommendations to follow the installation manual closely.
Key specs
- heat output:199000 BTU
- maximum flow rate:7.9 GPM
- wattage:19000 watts
- product dimensions:14.05W x 27.24H
- style:REP199iN Natural Gas
8.4

Good

Our Rating

9.3
Thermal power

9.1
Easy installation

9.1
Efficient Energy Use
10

HYDRO MASTER
HYDRO MASTER Tankless Water Heater Service Valve Kit with Pressure Relief Valve 3/4-Inch IPS Isolator Clean Brass
Main highlights

Key Features and Benefits
Lead-free brass, 3/4-Inch IPS, easy identification colored handles, includes pressure relief valve, CSA certified, easy installation.

Ideal Use Cases
Perfect for tankless water heater installations requiring safe, lead-free components and effective system isolation for maintenance.

Customer Reviews Summary
Highly praised for its straightforward installation process and the reliable, easy-to-use color-coded valve handles.
8.3

Good

Our Rating

9.1
Easy installation

8.9
Simple to use

8.4
worth the money

10 Best rinnai tankless water heaters of 2025

1

Rinnai CX199iN Condensing Smart Sense Commercial Natural Gas or Propane Tankless Water Heater, 199,000 BTU, 11.1 GPM

How do we rank?

How do we rank?

Analyzing top stores

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

Rinnai V53DeP Propane Tankless Water Heater, 5.3 GPM, Outdoor Installation

9.1

8.7

8.2

4

Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation

8.7

8.7

8.4

5

Rinnai RE199eP Non-Condensing Propane Tankless Water Heater, Up to 9.8 GPM, Outdoor Installation, 199,000 BTU

9.5

8.9

8.7

6

Rinnai RE140iP Non-Condensing Propane Tankless Water Heater, Up to 5.3 GPM, Indoor Installation, 140,000 BTU

9.3

9.1

9.1

7

Rinnai RUCS75iN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation

9.9

8.9

8.7

8

Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater, 9.5 GPM

8.0

8.0

8.0

9

Rinnai REP199iN Smart-Circ Non-Condensing Natural Gas Tankless Water Heater with Built-In Recirculation Pump, Up to 7.9 GPM, Indoor Installation, 199,000 BTU

9.3

9.1

9.1

10

HYDRO MASTER Tankless Water Heater Service Valve Kit with Pressure Relief Valve 3/4-Inch IPS Isolator Clean Brass

9.1

8.9

8.4

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