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10 Best Electric Tankless Hot Water Heater 2025 in the United States
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Buying Guide for the Best Electric Tankless Hot Water Heater
Choosing the right electric tankless hot water heater can significantly impact your comfort and energy efficiency at home. Unlike traditional water heaters, tankless models heat water on demand, which means they can provide a continuous supply of hot water without the need for a storage tank. To make an informed decision, it's important to understand the key specifications and how they relate to your specific needs.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 flow rate of 2-3 GPM is suitable for small households or single-point applications like a shower, while 4-6 GPM is better for larger households with multiple simultaneous hot water needs. Assess your household's peak hot water usage to choose the right flow rate.
Temperature RiseTemperature rise refers to how much the unit can increase the incoming water temperature. This is important because it affects how hot the water will be when it reaches your tap. For instance, if the incoming water is 50°F and you need it to be 120°F, the heater must provide a 70°F temperature rise. Higher temperature rise capabilities are necessary in colder climates where incoming water is colder. Consider your local water temperature and desired output temperature to determine the appropriate temperature rise.
Power RequirementsElectric tankless water heaters require a certain amount of electrical power to operate, typically measured in kilowatts (kW). This is important because it affects both the installation process and the unit's performance. Lower power units (around 10-15 kW) are suitable for smaller applications, while higher power units (20-30 kW or more) are needed for whole-house use. Ensure your home's electrical system can support the required power and consult an electrician if necessary.
Energy EfficiencyEnergy efficiency, often expressed as a percentage, indicates how effectively the unit converts electrical energy into hot water. Higher efficiency means lower energy consumption and reduced utility bills. Look for units with an efficiency rating of 90% or higher for the best performance. Consider your long-term energy savings when evaluating efficiency ratings.
Size and InstallationThe physical size of the unit and its installation requirements are important for ensuring it fits in your designated space and can be installed properly. Compact units are ideal for small spaces or point-of-use applications, while larger units may be necessary for whole-house systems. Check the dimensions and installation guidelines to ensure compatibility with your space and plumbing setup.
Warranty and SupportA good warranty and reliable customer support can provide peace of mind and protect your investment. Warranties typically cover parts and labor for a certain period, often ranging from 5 to 10 years. Consider the length and terms of the warranty, as well as the manufacturer's reputation for customer service, when making your decision.