ENERGY STAR® Certified Water Heaters


Sponsored by the U. S. Environmental Protection Agency and the Department of Energy, the ENERGY STAR® program promotes environmentally conscious products, which often can translate into savings for homeowners. We are pleased to announce that the following A. O. Smith high-efficiency water heaters have been recognized as ENERGY STAR® water heaters. These are ideal hot water solutions for the homeowner looking to go green and save green.

A. O. Smith Corporation certifies the following information related to tax credits provided under the Taxpayer Certainty and Disaster Tax Relief Act of 2019.

Each A. O. Smith water heater model listed is a natural gas, propane, or oil water heater that has a Uniform Energy Factor of at least 0.82 or has a thermal efficiency of at least 90%. Accordingly, each is Qualified Energy Property and, when placed into service on or after January 1, 2017 and on or before December 31, 2021, each qualifies for the $300 tax credit allowed under Section 25C of the Internal Revenue Code. If you have claimed previous tax credits in excess of $500, you cannot claim any credit for improvements installed in 2017 or after.

2021 Manufacturer's Certification Statement

High Efficiency Water Heater Models



ENERGY STAR® certified High Efficiency Water Heaters

Residential Water Heaters
Model Number Series Gallons
?Nominal Capacity is a representative number provided by a manufacturer for comparison purposes. The actual rated storage volume of our water heaters may be found on the product details page on our website.
 UEF Recovery Rise 90oF GPH Vent Connection (Inches) Input BTU/HR Height* Diameter First Hour Rating Gallons LEED Rating
Combi Boiler
ACB-199S-N 0 0.00 0 3 199000 32.50 0.00 0 0.0
ACB-110S-P 0 0.00 0 2 or 3 110000 32.50 0.00 0 0.0
ACB-199H-P 0 0.00 0 3 199000 32.50 0.00 0 0.0
ACB-150H-N 0 0.00 0 2 or 3 150000 32.50 0.00 0 0.0
ACB-150S-P 0 0.00 0 2 or 3 150000 32.50 0.00 0 0.0
ACB-110S-N 0 0.00 0 2 or 3 110000 32.50 0.00 0 0.0
ACB-110H-P 0 0.00 0 2 or 3 110000 32.50 0.00 0 0.0
ACB-199H-N 0 0.00 0 3 199000 32.50 0.00 0 0.0
ACB-110H-N 0 0.00 0 2 or 3 110000 32.50 0.00 0 0.0
ACB-150S-N 0 0.00 0 2 or 3 150000 32.50 0.00 0 0.0
ACB-199S-P 0 0.00 0 3 199000 32.50 0.00 0 0.0
ACB-150H-P 0 0.00 0 2 or 3 150000 32.50 0.00 0 0.0
Model Number Series Gallons
?Nominal Capacity is a representative number provided by a manufacturer for comparison purposes. The actual rated storage volume of our water heaters may be found on the product details page on our website.
 UEF Recovery Rise 90oF GPH Vent Connection (Inches) Input BTU/HR Height* Diameter First Hour Rating Gallons LEED Rating
ProLine XE® Vertex™
GDHE-50 50 0.88 129 2 or 3 100000 66.75 22.00 100 1.0
GDHE-50 (LP) 50 0.88 129 2 or 3 100000 66.75 22.00 100 1.0
Model Number Series Gallons
?Nominal Capacity is a representative number provided by a manufacturer for comparison purposes. The actual rated storage volume of our water heaters may be found on the product details page on our website.
 UEF Recovery Rise 90oF GPH Vent Connection (Inches) Input BTU/HR Height* Diameter First Hour Rating Gallons LEED Rating
ProLine XE® Voltex® Hybrid Electric Heat Pump
HPTU-80N 80 3.45 21 0 69.00 27.00 86 2.0
FPTU-80 80 3.45 0 0 69.00 27.00 84 0.0
HPTU-66N 66 3.45 21 0 61.00 27.00 79 2.0
FPTU-66 66 3.35 0 0 61.00 27.00 79 0.0
HPTU-50N 50 3.45 21 0 63.00 22.00 66 2.0
FPTU-50 50 3.42 0 0 63.00 22.00 66 2.0
Model Number Series Gallons
?Nominal Capacity is a representative number provided by a manufacturer for comparison purposes. The actual rated storage volume of our water heaters may be found on the product details page on our website.
 UEF Recovery Rise 90oF GPH Vent Connection (Inches) Input BTU/HR Height* Diameter First Hour Rating Gallons LEED Rating
ProLine® XE
GPVT-50 (LP) 50 0.72 56 4 50000 58.12 22.00 97 1.0
GPDX-50L (LP) 50 0.73 59 3 60000 60.25 22.00 118 0.0
GPNH-50 50 0.65 43 2 or 3 42000 57.44 22.00 71 1.0
GPVL-50 50 0.72 45 4 40000 50.75 24.00 79 1.0
GPVL-50 (LP) 50 0.72 45 4 40000 50.75 24.00 79 1.0
GPDT-50 50 0.72 50 2 or 3 or 4 45000 58.75 22.00 81 1.0
GPDX-50L 50 0.73 69 3 or 4 62000 60.25 22.00 118 1.0
GPVT-50 50 0.72 56 4 50000 58.12 22.00 97 1.0
GPVT-40 40 0.70 56 4 50000 59.25 20.00 87 1.0
GPVT-40 (LP) 40 0.70 56 4 50000 59.25 20.00 87 1.0
GPVL-40 40 0.67 45 4 40000 49.63 22.00 73 1.0
GPVL-40 (LP) 40 0.67 45 4 40000 49.63 22.00 73 1.0
GPNH-40 40 0.70 43 2 or 3 42000 58.63 20.00 76 1.0
GPDL-40 200 40 0.68 45 2 or 3 or 4 40000 49.50 22.00 74 1.0
GPDL-40L 200 40 0.68 45 2 or 3 or 4 40000 49.50 22.00 74 1.0
GPDL-40 (LP) 200 40 0.68 45 2 or 3 or 4 40000 49.50 22.00 74 1.0
GPDL-40L (LP) 200 40 0.68 45 2 or 3 or 4 40000 49.50 22.00 74 1.0
Model Number Series Gallons
?Nominal Capacity is a representative number provided by a manufacturer for comparison purposes. The actual rated storage volume of our water heaters may be found on the product details page on our website.
 UEF Recovery Rise 90oF GPH Vent Connection (Inches) Input BTU/HR Height* Diameter First Hour Rating Gallons LEED Rating
ProLine® XE High Efficiency Flue Damper
GCF-50 50 0.69 42 3 or 4 40000 57.25 22.00 84 1.0
GCFL-50 50 0.69 42 3 or 4 40000 49.50 24.00 78 1.0
GCF-50 (LP) 50 0.69 42 3 or 4 40000 57.25 22.00 84 1.0
GUF-50 50 0.70 42 3 or 4 40000 57.25 22.00 83 1.0
GCFL-40 (LP) 40 0.66 42 3 or 4 40000 47.75 22.00 65 1.0
GUF-40 40 0.65 42 3 or 4 40000 58.25 20.00 68 1.0
GCFL-40 40 0.66 42 3 or 4 40000 47.75 22.00 65 1.0
GCF-40 40 0.64 42 3 or 4 40000 58.25 20.00 70 1.0
GCF-40 (LP) 40 0.64 42 3 or 4 40000 58.25 20.00 70 1.0
Model Number Series Gallons
?Nominal Capacity is a representative number provided by a manufacturer for comparison purposes. The actual rated storage volume of our water heaters may be found on the product details page on our website.
 UEF Recovery Rise 90oF GPH Vent Connection (Inches) Input BTU/HR Height* Diameter First Hour Rating Gallons LEED Rating
ProLine® XE Vertex™
GDHE-75 (LP) 75 0.86 129 2 or 3 100000 64.75 27.75 130 1.0
GDHE-75 75 0.86 129 2 or 3 100000 64.75 27.75 130 1.0
Model Number Series Gallons
?Nominal Capacity is a representative number provided by a manufacturer for comparison purposes. The actual rated storage volume of our water heaters may be found on the product details page on our website.
 UEF Recovery Rise 90oF GPH Vent Connection (Inches) Input BTU/HR Height* Diameter First Hour Rating Gallons LEED Rating
ProMax®
GPDT-50 (LP) 50 0.68 50 2 or 3 or 4 45000 58.75 22.00 81 0.0
Model Number Series Gallons
?Nominal Capacity is a representative number provided by a manufacturer for comparison purposes. The actual rated storage volume of our water heaters may be found on the product details page on our website.
 UEF Recovery Rise 90oF GPH Vent Connection (Inches) Input BTU/HR Height* Diameter First Hour Rating Gallons LEED Rating
Tankless
ATI-240H-N 100 0 0.94 0 3 or 4 160000 23.63 0.00 0 1.5
ATI-240H-P 101 0 0.94 0 3 or 4 160000 23.63 0.00 0 1.5
ATI-340H-N 100 0 0.95 0 3 or 4 180000 23.63 0.00 0 1.5
ATI-340H-P 100 0 0.95 0 3 or 4 180000 23.63 0.00 0 1.5
ATI-540H-N 100 0 0.93 0 3 or 4 199000 23.63 0.00 0 1.5
ATI-540H-P 100 0 0.93 0 3 or 4 199000 23.63 0.00 0 1.5
ATO-240H-N 100 0 0.95 0 3 or 4 160000 23.63 0.00 0 1.5
ATO-240H-P 101 0 0.95 0 3 or 4 160000 23.63 0.00 0 1.5
ATO-340H-N 101 0 0.94 0 3 or 4 180000 23.63 0.00 0 1.5
ATO-340H-P 101 0 0.94 0 3 or 4 180000 23.63 0.00 0 1.5
ATO-540H-N 101 0 0.95 0 3 or 4 199000 23.63 0.00 0 1.5
ATO-540H-P 101 0 0.95 0 3 or 4 199000 23.63 0.00 0 1.5
ATI-140H-N 100 0 0.90 0 3 or 4 120000 22.87 0.00 0 1.5
ATO-140H-N 101 0 0.91 0 3 or 4 120000 22.87 0.00 0 1.5
ATI-140H-P 100 0 0.90 0 3 or 4 120000 22.87 0.00 0 1.5
ATO-140H-P 101 0 0.91 0 3 or 4 120000 22.87 0.00 0 1.5
ATO-540P-N 100 0 0.93 0 3 or 4 199000 23.63 0.00 0 1.5
ATO-540P-P 101 0 0.95 0 3 or 4 199000 23.63 0.00 0 1.5
ATI-540P-N 100 0 0.93 0 3 or 4 199000 23.63 0.00 0 1.5
ATI-540P-P 101 0 0.95 0 3 or 4 199000 23.63 0.00 0 1.5



Commercial Water Heaters

Cyclone

 
Model Number   Input   Water Heater Volume   Thermal Efficiency   Standby Loss   Fuel Type  
BTX 100 100,000 50 gallon 0.96 499 Nat Gas
BTX 100 100,000 50 gallon 0.96 499 LP Gas
BTH 120 120,000 60 gallon 0.95 613 Nat Gas
BTH 120 120,000 60 gallon 0.95 613 LP Gas
BTH 150 150,000 100 gallon 0.98 1079 Nat Gas
BTH 150 150,000 100 gallon 0.98 1079 LP Gas
BTH 199 199,900 100 gallon 0.97 967 Nat Gas
BTH 199 199,900 100 gallon 0.97 967 LP Gas
BTH 250 250,000 100 gallon 0.96 748 Nat Gas
BTH 250 250,000 100 gallon 0.96 748 LP Gas
BTH 300A 300,000 119 gallon 0.96 1084 Nat Gas
BTH 300A 300,000 119 gallon 0.96 1084 LP Gas
BTH 300 300,000 119 gallon 0.96 1084 Nat Gas
BTH 300 300,000 119 gallon 0.96 1084 LP Gas
BTH 400A 399,900 119 gallon 0.95 1,100 Nat Gas
BTH 400A 399,900 119 gallon 0.95 1,100 LP Gas
BTH 400 399,900 119 gallon 0.95 1,100 Nat Gas
BTH 400 399,900 119 gallon 0.95 1,100 LP Gas
BTH 500A 499,900 119 gallon 0.95 1,080 Nat Gas
BTH 500A 499,900 119 gallon 0.95 1,080 LP Gas
BTH 500 499,900 119 gallon 0.95 1,080 Nat Gas
BTH 500 499,900 119 gallon 0.95 1,080 LP Gas


XP Hot Water Boiler

 
Model Number   Input   Water Heater Volume   Thermal Efficiency   Standby Loss   Fuel Type  
XWH 1000N 920,000 3 gallon 0.95 NA Nat Gas
XWH 1000P 999,900 3 gallon 0.95 NA LP Gas
XWH 1300 1,300,000 4 gallon 0.95 NA Yes
XWH 1700 1,700,000 5 gallon 0.95 NA Yes
XWH 2000 1,999,900 6 gallon 0.95 NA Yes
XWH 2600 2,600,000 8 gallon 0.95 NA Yes
XWH 3400 3,400,000 9.9 gallon 0.95 NA Yes