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10 Best Tankless Water Heaters 2025 in the United States
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Buying Guide for the Best Tankless Water Heaters
Choosing the right tankless water heater can significantly improve your home's energy efficiency and ensure you have a reliable supply of hot water. Tankless water heaters, also known as on-demand water heaters, heat water directly without the use of a storage tank. When a hot water tap is turned on, cold water travels through a pipe into the unit and is heated either by a gas burner or an electric element. This means you get a constant supply of hot water. To find the best fit for your needs, consider the following key specifications and how they align with your household's requirements.Flow RateFlow rate, measured in gallons per minute (GPM), indicates how much hot water the unit can produce at a time. This is crucial because it determines whether the heater can meet your household's hot water demands. For example, a shower typically requires 2-3 GPM, while a dishwasher might need 1-2 GPM. If you have a large family or multiple hot water needs simultaneously, you'll need a higher flow rate. Conversely, for smaller households or less simultaneous usage, a lower flow rate will suffice. Assess your peak hot water usage to determine the appropriate flow rate for your home.
Energy EfficiencyEnergy efficiency is measured by the unit's Energy Factor (EF), which indicates how efficiently the water heater converts energy into hot water. A higher EF means better efficiency and lower energy costs. Tankless water heaters generally have higher EF ratings compared to traditional tank heaters. Look for units with an EF of 0.8 or higher for optimal efficiency. If reducing energy consumption and saving on utility bills is a priority for you, choose a model with a high EF rating.
Fuel TypeTankless water heaters can be powered by electricity, natural gas, or propane. The choice of fuel type affects installation costs, operating costs, and efficiency. Electric models are typically easier to install and maintain but may have higher operating costs depending on your local electricity rates. Gas models, while often more efficient and cheaper to operate, require proper venting and may have higher installation costs. Consider the availability and cost of fuel in your area, as well as your home's existing infrastructure, when choosing the fuel type.
Size and InstallationThe physical size of the tankless water heater and its installation requirements are important factors. Tankless units are generally more compact than traditional tank heaters, but you still need to ensure you have enough space for installation. Additionally, gas models require venting, which can add to the installation complexity. Electric models are usually easier to install but may require an upgrade to your electrical system. Evaluate the available space and the complexity of installation in your home to choose a unit that fits well and can be installed without significant modifications.
Temperature RiseTemperature rise refers to the difference between the incoming water temperature and the desired output temperature. This is important because it affects the heater's ability to provide hot water at the desired temperature. For instance, if your incoming water temperature is 50°F and you want it heated to 120°F, the unit needs to handle a 70°F temperature rise. Higher temperature rise requirements may reduce the flow rate. Consider the climate in your area and the typical temperature of your incoming water to ensure the unit can meet your hot water needs.
Warranty and SupportA good warranty and reliable customer support are essential for peace of mind and long-term satisfaction with your tankless water heater. Warranties can vary significantly between manufacturers, covering different components for different lengths of time. Look for a unit with a comprehensive warranty that covers both parts and labor for an extended period. Additionally, consider the reputation of the manufacturer and the availability of customer support. A strong warranty and good support can save you money and hassle in the long run.