10 Best Water Heaters of 2025

Our top 3 picks

• #1

  

  

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  Airthereal Electric Tankless Water Heater, 27kW, 240Volts - Endless On-Demand Hot Water - Self Modulates to Save Energy Use - Small Enough to Install Anywhere - for 3 Showers, Evening Tide series

  The Airthereal Electric Tankless Water Heater EVT-27K offers an innovative solution for those seeking endless hot water without the bulk of traditional tanks. This unit provides on-demand hot water, ensuring you never face cold showers again. Its compact, wall-mounted design saves up to 90% of space compared to traditional water heaters, making it ideal for homes with limited space. The self-modulating technology only heats water when needed, significantly reducing energy usage and cutting down on utility bills by up to 50%. Customers have praised its consistent performance, even when supplying multiple showers or appliances simultaneously. While installation may require professional help due to specific electrical requirements, the long-term benefits of energy efficiency and space-saving make it a worthy investment for modern households. Whether for everyday use or as a backup solution, this water heater meets diverse needs effectively.
• #2

  

  

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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.
• #3

  

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  Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2

  The Stiebel Eltron Tempra 24 Plus Electric Tankless Water Heater is a top-tier choice for those seeking a reliable and energy-efficient hot water solution. Its advanced Continuous Flow Technology ensures uninterrupted hot water by automatically adjusting flow to meet demand. This compact, sleek unit is perfect for whole-house use, saving space and energy with its eco-friendly design. Customers consistently praise its reliability, quiet operation, and the convenience of its precise temperature control. Ideal for homes where space is at a premium, this water heater provides an endless supply of hot water, making it a smart, modern alternative to traditional tank systems. Whether you're upgrading for efficiency or looking to maximize space, the Tempra 24 Plus delivers outstanding performance and satisfaction.