Best tankless gas water heaters

Our top 3 picks

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  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 Tankless Water Heater offers versatile installation options, supporting both indoor and outdoor setups. With a compact design comparable to a small suitcase, it efficiently delivers up to 11.1 gallons per minute, making it ideal for large households with multiple simultaneous users. Powered by either natural gas or propane, it features Smart Sense gas control for seamless operation. Customers appreciate its reliable performance, particularly its ability to provide endless hot water, which is invaluable for families. While the electronic adjustments are simple to use, some users noted difficulties with the app functionality. For optimal maintenance, especially in hard water areas, additional valves for recirculating cleaning solutions are recommended. Overall, this tankless water heater combines efficiency with convenience, ensuring you never run out of hot water.
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  Rheem RRTGH84DVLN3701171 Rheem RTGH Series 8.4 GPM 157,000 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel

  The Rheem RRTGH84DVLN3701171 is a high-efficiency, tankless water heater designed for residential indoor use. With a flow rate ranging from 0.4 to 8.4 GPM and temperature settings adjustable from 100 to 140°F, it offers versatile and efficient hot water delivery. The electric ignition and compact design make it a convenient choice for modern homes, while the stainless steel construction ensures durability. Ideal for areas with cold inlet water temperatures, this unit heats water quickly, as confirmed by customer reviews. Users have noted a significant reduction in gas bills, highlighting its energy efficiency. Despite occasional humming noises, the overall performance and cost savings make it a highly recommended choice for homeowners seeking a reliable and efficient water heating solution.
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  Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater 8.4 GPM, 180,000 BTUs

  The Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater is an excellent choice for households with 2–3 bathrooms. With a capacity of 8.4 GPM and powered by 180,000 BTUs, it ensures a steady supply of hot water even during peak times. Designed for outdoor installation, this unit saves indoor space and is equipped with hot-start programming to prevent cold water bursts, making it perfect for consecutive showers. Built with a durable metal cabinet, it promises longevity and reliability. Ideal for homes with multiple hot water demands, this tankless water heater offers both efficiency and performance, ensuring comfort and convenience for everyday use.