Water heater specs, efficiency comparisons, and sizing by household

1,101 ENERGY STAR certified water heaters across 61 brands — heat pump, gas tankless and gas storage, every spec traced to its EPA record.

Source
U.S. EPA ENERGY STAR certified water heater datasets
Coverage
1101 models · 61 brands
Data snapshot

Methodology — every formula, and what this data cannot tell you.

What will it cost to run?

Enter your electricity and gas rates and the operating-cost tool converts each unit's certified UEF into an annual bill you can compare directly — the difference between two units over ten years is usually larger than the difference in purchase price.

Also: heat pump vs gas

Compare running costs

Efficiency (UEF), first-hour rating, flow rate and annual energy use — plus the running-cost math done for you at your own fuel prices, and sizing from your real peak hour rather than the number on the tank.

Browse water heaters

More ways to narrow

Highest certified efficiency

Uniform Energy Factor as certified under the DOE test procedure — the energy delivered as hot water per unit of energy consumed.

# Model UEF Type First-hour rating
1 GE Profile Heat Pump 50-Gallon (PH50S10BNY01) 4.5 Heat pump 75 gal
2 GE Profile Heat Pump 80-Gallon (PH80S10BNY01) 4.5 Heat pump 101 gal
3 GE Profile Heat Pump 80-Gallon (PH80S10BPY01) 4.4 Heat pump 101 gal
4 GE Profile Heat Pump 50-Gallon (PH50S10BPY01) 4.3 Heat pump 77 gal
5 GE Profile Heat Pump 65-Gallon (PH65S10BNY01) 4.3 Heat pump 86 gal
6 GE Profile Heat Pump 65-Gallon (PH65S10BPY01) 4.3 Heat pump 87 gal
7 Eco-Logical OMNI-50HP2-1A 50-Gallon 4.23 Heat pump 57 gal
8 Bradford White RE2HP65-1NCTT 65-Gallon 4.2 Heat pump 82 gal

Read with care UEF is not comparable across fuel types: heat pumps move heat rather than making it, so they score above 1.0 while efficient gas units sit below it. Compare within a type, or compare running cost instead.

Sized for your household

Sized from your peak hour — first-hour rating for tanks, winter flow rate at a real temperature rise for tankless — not from the sticker on the tank.

Frequently compared

Buying and installation guides

Guides are written and checked by a person against the dataset or manufacturer documentation — see the editorial policy. Everything above them on this page is generated from the dataset.

New to water heaters? Start with the glossary — UEF, first-hour rating, and temperature rise in plain English.