CO₂ (R-744) heat pump water heaters on file
Heat pump models whose ENERGY STAR filing names R-744 (carbon dioxide) as the refrigerant, a global warming potential of 1.
42 registered models are CO₂ (R-744) heat pump water heaters. Their filed UEF runs from 3.52 to 3.8 across 2 draw patterns. Each is listed below with its yearly energy, and compared only with others of the same draw pattern.
Other collections
Medium draw pattern
a typical three- or four-person household, about 55 gallons on a busy morning — 22 models, lowest yearly energy first.
-
A. O. SMITH HPACO-45 1**+AXST-50LBTTP 1**
-
AMERICAN HPACO-45 1**+AXST-50LBTTP 1**
-
GIANT HPACO-45 1**+AXST-50LBTTP 1**
-
GSW WATER HEATERS HPACO-45 1**+AXST-50LBTTP 1**
-
JOHN WOOD HPACO-45 1**+AXST-50LBTTP 1**
-
LOCHINVAR HPACO-45 1**+AXST-50LBTTP 1**
-
RELIANCE WATER HEATERS HPACO-45 1**+AXST-50LBTTP 1**
-
STATE HPACO-45 1**+AXST-50LBTTP 1**
-
A. O. SMITH HPACO-45 1**+AXST-50S 1**
-
A. O. SMITH HPACO-45 1**+AXST-50T 1**
-
AMERICAN HPACO-45 1**+AXST-50S 1**
-
AMERICAN HPACO-45 1**+AXST-50T 1**
-
GIANT HPACO-45 1**+AXST-50S 1**
-
GSW WATER HEATERS HPACO-45 1**+AXST-50S 1**
-
JOHN WOOD HPACO-45 1**+AXST-50S 1**
-
JOHN WOOD HPACO-45 1**+AXST-50T 1**
-
LOCHINVAR HPACO-45 1**+AXST-50S 1**
-
LOCHINVAR HPACO-45 1**+AXST-50T 1**
-
RELIANCE WATER HEATERS HPACO-45 1**+AXST-50S 1**
-
RELIANCE WATER HEATERS HPACO-45 1**+AXST-50T 1**
-
STATE HPACO-45 1**+AXST-50S 1**
-
STATE HPACO-45 1**+AXST-50T 1**
High draw pattern
a larger household, or one where showers and laundry overlap — 20 models, lowest yearly energy first.
-
A. O. SMITH HPACO-45 1**+AXST-80 1**
-
AMERICAN HPACO-45 1**+AXST-80 1**
-
GIANT HPACO-45 1**+AXST-80 1**
-
GSW WATER HEATERS HPACO-45 1**+AXST-80 1**
-
JOHN WOOD HPACO-45 1**+AXST-80 1**
-
LOCHINVAR HPACO-45 1**+AXST-80 1**
-
Reclaim Energy MP80F-RC
-
RELIANCE WATER HEATERS HPACO-45 1**+AXST-80 1**
-
STATE HPACO-45 1**+AXST-80 1**
-
VAUGHN THERMAL MP80F-RC
-
Reclaim Energy MP120F-RC
-
VAUGHN THERMAL MP120F-RC
-
A. O. SMITH HPACO-45 1**+AXST-66 1**
-
AMERICAN HPACO-45 1**+AXST-66 1**
-
GIANT HPACO-45 1**+AXST-66 1**
-
GSW WATER HEATERS HPACO-45 1**+AXST-66 1**
-
JOHN WOOD HPACO-45 1**+AXST-66 1**
-
LOCHINVAR HPACO-45 1**+AXST-66 1**
-
RELIANCE WATER HEATERS HPACO-45 1**+AXST-66 1**
-
STATE HPACO-45 1**+AXST-66 1**
Related pages
-
Find what replaces your water heater
Enter the model number off your old unit and see what is on file today, with the yearly cost difference.
-
Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
-
What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
-
Water heaters
Every model on file with the Department of Energy, by heater type.
-
Water heater recalls on file
Every CPSC recall since 2015 and the models on file it names.
-
Heat pump water heater rebates by state
Which programs pay today, whether their funding is open, and which models qualify.
-
How the numbers are calculated
The formula, the tariff rule and where published costs disagree.
-
What is a good first hour rating for a water heater?
The first hour rating every storage model on file actually lists, by tank size, next to the DOE method for checking it against your own household.