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10 Best Propane Tankless Water Heaters 2025 in the United States
#1
Winner
NEW Rinnai RXP199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU
The Rinnai RXP199iN is a robust propane tankless water heater that promises to cater to a wide range of hot water needs, making it ideal for larger households or properties with multiple fixtures operating simultaneously. With a flow rate of up to 11.1 gallons per minute (GPM) and a powerful BTU rating of 199,000, this unit can deliver a consistent supply of hot water without the risk of running out, which is a major plus for busy homes.
Rating
9.9
Chosen by1,322
Flow Rate (GPM)
Energy Efficiency
Size and Installation
Most important from
192 reviews
#2
Ranein Propane Gas Tankless Water Heater with Vent Pipe, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot Water Heater
The Ranein Propane Gas Tankless Water Heater is designed to efficiently provide hot water on demand, making it a solid choice for households needing consistent hot water across multiple points. Its maximum flow rate of 4.3 GPM and a powerful 100,000 BTU rating allow it to serve kitchens and bathrooms effectively, ensuring you won’t have to wait for hot water to arrive. One of its standout features is the 'Four Seasons Function,' which automatically adjusts the water temperature based on seasonal changes, along with specific settings for kitchen and bathtub use, enhancing user convenience.
Rating
9.8
Flow Rate (GPM)
Energy Efficiency
Temperature Rise
Most important from
713 reviews
#3
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
The Rinnai RX199iN Condensing Smart Sense Water Heater is a strong contender in the propane tankless water heater category. With a commendable flow rate of up to 11.1 gallons per minute (GPM), it can support multiple fixtures simultaneously, making it ideal for larger households or busy environments. Its impressive BTU rating of 199,000 ensures quick heating, allowing you to enjoy hot water without interruptions.
Rating
9.6
Flow Rate (GPM)
Size and Installation
Most important from
192 reviews
Top 10 Best Propane Tankless Water Heaters 2025 in the United States
#1
Winner
9.9 score
NEW Rinnai RXP199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU
NEW Rinnai RXP199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU
Flow Rate (GPM): 11.1
BTU Rating: 199000
Energy Efficiency: 0.98 UEF
Size and Installation: 19"W x 31"H, Wall Mount
Chosen by 1322 this week
Ranein Propane Gas Tankless Water Heater with Vent Pipe, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot Water Heater
Ranein Propane Gas Tankless Water Heater with Vent Pipe, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot Water Heater
Flow Rate (GPM): 4.3
BTU Rating: 100,000
Energy Efficiency: oxygen-free copper water tank
Venting Requirements: exhaust pipe included
Size and Installation: 18.89"W x 8.85"H, 28 pounds
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
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
Flow Rate (GPM): 11.1 GPM
BTU Rating: 199,000
Energy Efficiency: .98 UEF
Venting Requirements: Versa Vent
Size and Installation: 18.5"W x 30.11"H, Wall Mount
Ranein Propane Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
Ranein Propane Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
Flow Rate (GPM): 3.6
BTU Rating: 80,000
Energy Efficiency: reduces heat loss and consumption
Venting Requirements: exhaust pipe included
Size and Installation: 19.09"W x 7.67"H, wall-mount
Rinnai RE199eP Non-Condensing Propane Tankless Water Heater, Up to 9.8 GPM, Outdoor Installation, 199,000 BTU
Rinnai RE199eP Non-Condensing Propane Tankless Water Heater, Up to 9.8 GPM, Outdoor Installation, 199,000 BTU
Flow Rate (GPM): 7.6
BTU Rating: 199000
Energy Efficiency: heats water when necessary
Size and Installation: 14.05"W x 27.34"H, 52.7 pounds
Related Products
Rinnai V53DeP Propane Tankless Water Heater, 5.3 GPM, Outdoor Installation
Rinnai V53DeP Propane Tankless Water Heater, 5.3 GPM, Outdoor Installation
Flow Rate (GPM): 5.3
Energy Efficiency: High-Efficiency
Venting Requirements: Outdoor installation
Size and Installation: 13"W x 30"H, 33 pounds
65,000 BTU RV Tankless Water Heater without Door, KINGRVER, Propane Gas, DC 12V, 3 Optional Door Sizes 15"x15", 15"x18" and 18"x18" for Refitment, Compatible with All RVs, High Altitude
65,000 BTU RV Tankless Water Heater without Door, KINGRVER, Propane Gas, DC 12V, 3 Optional Door Sizes 15"x15", 15"x18" and 18"x18" for Refitment, Compatible with All RVs, High Altitude
Flow Rate (GPM): 0.5 GPM
BTU Rating: 65000 British Thermal Units
Energy Efficiency: High Efficiency
Venting Requirements: Proper venting critical for safety
Size and Installation: 12.7"W x 12.7"H, internal mount
Rheem RTGH-84DVLP-3 RTGH Series 8.4 GPM Indoor Liquid Propane Tankless Water Heater
Rheem RTGH-84DVLP-3 RTGH Series 8.4 GPM Indoor Liquid Propane Tankless Water Heater
Flow Rate (GPM): 8.4
Energy Efficiency: 0.93 UEF
Temperature Rise: 100 to 140F
Size and Installation: 17.7"W x 23.7"H
#10
7.9 score
Rheem RTG-84DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater, 8.4 GPM
Rheem RTG-84DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater, 8.4 GPM
Flow Rate (GPM): 8.4
Energy Efficiency: Operates when needed
Size and Installation: 13.5"W x 24.2"H, Wall, Indoor
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Buying Guide for the Best Propane Tankless Water Heaters
Choosing the right propane tankless water heater can significantly improve your home's energy efficiency and ensure you have a reliable supply of hot water. Unlike traditional water heaters, tankless models heat water on demand, which means they can save you money on energy bills and provide an endless supply of hot water. However, selecting the right model involves understanding several key specifications and how they align with your needs. Here’s a guide to help you navigate through the essential specs and make an informed decision.Flow Rate (GPM)Flow rate, measured in gallons per minute (GPM), indicates how much hot water the unit can produce at a given time. This is crucial because it determines whether the heater can meet your household's hot water demands. For instance, a flow rate of 3-4 GPM might be sufficient for a small household with one or two simultaneous hot water needs, like a shower and a sink. Larger households or those with higher hot water demands might require a flow rate of 7-10 GPM to ensure multiple showers, appliances, and faucets can run simultaneously without a drop in performance. Assess your household's peak hot water usage to determine the appropriate flow rate.
BTU RatingBTU (British Thermal Unit) rating measures the heater's heating capacity. A higher BTU rating means the unit can heat water more quickly and handle higher flow rates. For smaller homes or less demanding hot water needs, a unit with a lower BTU rating (around 100,000-150,000 BTUs) may be sufficient. Larger homes or those with higher hot water demands should consider units with higher BTU ratings (up to 200,000 BTUs or more). Consider your household size and hot water usage patterns to choose a unit with an appropriate BTU rating.
Energy EfficiencyEnergy efficiency is indicated by the unit's Energy Factor (EF) or Uniform Energy Factor (UEF). These ratings reflect how efficiently the heater converts fuel into hot water. Higher ratings mean better efficiency and lower operating costs. Look for units with an EF or UEF of 0.8 or higher for good efficiency. If you prioritize energy savings and environmental impact, opt for models with higher efficiency ratings. Consider your long-term energy costs and environmental goals when evaluating this spec.
Venting RequirementsPropane tankless water heaters require proper venting to safely expel combustion gases. There are two main types: direct vent and power vent. Direct vent units draw air from outside and are generally more flexible in installation but may require more complex venting setups. Power vent units use indoor air and typically need only one vent pipe, making them easier to install but potentially less efficient. Assess your installation space and preferences to determine which venting type suits your needs.
Temperature RiseTemperature rise refers to the increase in water temperature the unit can achieve. This is important because it affects how hot the water will be when it reaches your taps. If you live in a colder climate where incoming water temperatures are low, you'll need a unit with a higher temperature rise capability. For warmer climates, a lower temperature rise may be sufficient. Consider the incoming water temperature in your area and your desired hot water temperature to choose a unit with the appropriate temperature rise.
Size and InstallationThe physical size of the unit and its installation requirements are important to consider, especially if you have limited space. Tankless water heaters are generally more compact than traditional tanks, but they still need adequate space for installation and maintenance. Ensure you have enough room for the unit and any necessary venting or piping. If space is tight, look for more compact models or consult with a professional to determine the best installation options for your home.