UEF Efficiency Rating Calculator
UEF Efficiency Rating Calculator
Compare Uniform Energy Factors (UEF) to see real utility savings.
Table of Contents
Settings
Gas: 0.5-0.9, Electric standard: 0.9-0.95, Hybrid: 2.0-3.8+
Performance
Efficiency Class Rating
Standard Electric
$0 / year
Annual Savings vs Baseline (0.60 Gas / 0.90 Electric)
$0
What is UEF? Uniform Energy Factor is the federally mandated metric for measuring residential water heater efficiency. The higher the number, the more efficiently fuel is converted to hot water.
Uniform Energy Factor (UEF) Savings
UEF is the government standard measuring water heater efficiency. Higher UEF values mean more of the fuel input is converted directly into hot water, leaving less to waste.
Formula Used
Annual Energy Savings = Hot Water Demand / Baseline UEF - Hot Water Demand / New UEF
Reference Quick Chart
| UEF Rating Range | Technology Type | Efficiency Efficiency Profile |
|---|---|---|
| 0.58 - 0.65 UEF | Older Gas Tank Heaters | Low Efficiency (35-40% Fuel loss) |
| 0.91 - 0.95 UEF | Standard Electric / Gas Tankless | Highly Efficient |
| 2.50 - 4.00+ UEF | Hybrid Heat Pump Heaters | Ultra-High Efficiency (Extremely Low bills) |
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