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ENERGY STAR Certified
Water Heaters

Visit the  Water Heaters page for usage tips and buying guidelines.
Efficiency and performance for ENERGY STAR certified water heaters may be evaluated using two different methods. The results of testing from these methods are not directly comparable. Solar water heater products have requirements for Solar Energy Factor (SEF), not Uniform Energy Factor (UEF).

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1465 Records Found

compare 2-4 products
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Gas Tankless - Propane
Uniform Energy Factor (UEF):
Energy Factor:
0.94
Thermal Efficiency (TE):
Gas Tankless - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.95
Thermal Efficiency (TE):
Gas Tankless - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.95
Thermal Efficiency (TE):
Gas Tankless - Propane
Uniform Energy Factor (UEF):
Energy Factor:
0.94
Thermal Efficiency (TE):
Gas Tankless - Propane
Uniform Energy Factor (UEF):
Energy Factor:
0.95
Thermal Efficiency (TE):
Gas Storage - Propane
Uniform Energy Factor (UEF):
Energy Factor:
0.67
Thermal Efficiency (TE):
Gas Storage - Propane
Uniform Energy Factor (UEF):
Energy Factor:
0.7
Thermal Efficiency (TE):
Gas Storage - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.71
Thermal Efficiency (TE):
Gas Storage - Propane
Uniform Energy Factor (UEF):
Energy Factor:
0.7
Thermal Efficiency (TE):
Gas Storage - Propane
Uniform Energy Factor (UEF):
Energy Factor:
0.7
Thermal Efficiency (TE):
Gas Storage - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.7
Thermal Efficiency (TE):
Gas Storage - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.7
Thermal Efficiency (TE):
Gas Storage - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.7
Thermal Efficiency (TE):
Gas Storage - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.7
Thermal Efficiency (TE):
Gas Storage - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.71
Thermal Efficiency (TE):
Gas Tankless - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.95
Thermal Efficiency (TE):
Gas Storage - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.67
Thermal Efficiency (TE):
Gas Storage - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.7
Thermal Efficiency (TE):
Gas Storage - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.7
Thermal Efficiency (TE):
Gas Storage - Natural Gas
Uniform Energy Factor (UEF):
Energy Factor:
0.7
Thermal Efficiency (TE):