What is the Energy Factor on the Hot Water Tank screen?

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A water heater's energy efficiency is determined by the energy factor. The energy factor (EF) indicates a water heater's overall energy efficiency based on the amount of hot water produced per unit of fuel consumed over a typical day.

The higher the energy factor, the more efficient the water heater. Product literature from a manufacturer usually provides a water heater model's energy factor.

 

Below are some example energy factors:

 

Water Heater Type

 

 

Efficiency Factor

 

 

Approximate Annual Cost

 

 

Estimated Lifetime Savings

 

GAS      
Standard Tank
.58 – .60
$250
n/a
Energy Star Tank
.67 – .70
$225
$250-$300
Non-Condensing Tankless
.82 – .85
$175
$1,150-$1,500
Condensing Tankless
.92 – .94
$150
$1,500-$2,000
Hybrid Condensing Tankless
.92 – .96
$130
$1,800-$2,400
ELECTRIC      
Standard Tank
.90 – .93
$500
n/a
High-Efficiency Tank
.94 – .95
$485
$150
Hybrid Heat Pump
2.0
$250
$2,500+
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