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Data / ENERGY STAR / Gas water heaters / A. O. Smith

A. O. Smith ENERGY STAR certified gas water heaters: 83 models

A. O. Smith has 83 ENERGY STAR certified products in gas water heaters on the EPA's list as read on November 4, 2026, which puts it number 2 of 33 brands by model count. Its newest certification is GPCC-50X 1**, dated August 13, 2026.

SpecStream is the live web data engine for teams and agents. It reads the EPA's ENERGY STAR certified product lists, keyed on the ENERGY STAR Unique ID, and this page is that reading. Ask for the products you track by category, brand or rating, and each new certification arrives in your sheet, CRM, Slack or agent as the EPA publishes it.

Get all A. O. Smith models certified in gas water heatersWatch new A. O. Smith certificationsCompare brands in gas water heaters
  • 83Certified products
  • August 13, 2026Newest certification
  • 33Brands in this category

A. O. Smith certified gas water heaters

Newest first. Each row links to the product's record in the EPA's open data portal.

ModelUniform Energy Factor (UEF)Storage Volume (gallons)Recovery Efficiency (%)ENERGY STAR IDCertifiedSource
GPCC-50X 1**0.949924689614August 13, 2026data.energystar.gov
ATM-140M-N 1**0.951974670344July 15, 2026data.energystar.gov
ATM-140X3-N 1**0.951974670343July 15, 2026data.energystar.gov
GT15TM-140M-N 1**0.951974670334July 15, 2026data.energystar.gov
ACTH-199M-(N,P) 1**0.951974670329July 15, 2026data.energystar.gov
ATM-160X3-P 1*10.951964670328July 15, 2026data.energystar.gov
GT15TM-160M-N 1**0.951964670327July 15, 2026data.energystar.gov
GT15TM-160X3-N 1**0.951964670326July 15, 2026data.energystar.gov
ATM-160M-P 1*10.951964670325July 15, 2026data.energystar.gov
GT15TM-160M-P 1*10.951964670316July 15, 2026data.energystar.gov
GT15TM-160X3-P 1*10.951964670315July 15, 2026data.energystar.gov
HCCC-50T 1**0.8649934617145May 27, 2026data.energystar.gov
ATM-180X3-P 1*10.951964617144May 27, 2026data.energystar.gov
ATM-199X3-P 1*10.951964617143May 27, 2026data.energystar.gov
GT15TM-180M-N 1**0.951964617142May 27, 2026data.energystar.gov
GT15TM-180X3-N 1**0.951964617141May 27, 2026data.energystar.gov
GT15TM-199M-N 1**0.951964617140May 27, 2026data.energystar.gov
GT15TM-199X3-N 1**0.951964617139May 27, 2026data.energystar.gov
ATM-180M-P 1*10.951964617138May 27, 2026data.energystar.gov
ATM-199M-P 1*10.951964617137May 27, 2026data.energystar.gov
GT15TM-180M-P 1*10.951964617120May 27, 2026data.energystar.gov
GT15TM-199M-P 1*10.951964617119May 27, 2026data.energystar.gov
GT15TM-199X3-P 1*10.951964617118May 27, 2026data.energystar.gov
GPCC-40L 1**0.938912408766March 24, 2026data.energystar.gov
GPCT-40L 1**0.938912408769February 25, 2026data.energystar.gov
GPCX-50L 1**0.949922408768February 25, 2026data.energystar.gov
HDHE-75 4**0.8674974518079December 12, 2025data.energystar.gov
HDHE-50 4**0.8849974518078December 12, 2025data.energystar.gov
GT15TM-199M-N0.951964015975April 21, 2025data.energystar.gov
GT15TM-199X3-N0.951964015974April 21, 2025data.energystar.gov
GT15TM-160M-N0.951964015972April 21, 2025data.energystar.gov
GT15TM-160X3-N0.951964015971April 21, 2025data.energystar.gov
GT15TM-180X3-N0.951964015962April 21, 2025data.energystar.gov
ATM-160X3-N 1**0.951964015961April 21, 2025data.energystar.gov
GT15TM-180M-N0.951964015960April 21, 2025data.energystar.gov
ATM-180X3-N 1**0.951964015951April 21, 2025data.energystar.gov
ATM-199X3-N 1**0.951964015943April 21, 2025data.energystar.gov
ATM-199M-N 1**0.951964015941April 21, 2025data.energystar.gov
ATM-160M-N 1**0.951964015940April 21, 2025data.energystar.gov
ATM-180M-N 1**0.951964015939April 21, 2025data.energystar.gov
GC9-PS5065NV 1**0.949923798669March 3, 2025data.energystar.gov
GC9-PS4050NV 1**0.938913798675November 13, 2024data.energystar.gov
HPCT-40L 1**0.938913798670November 13, 2024data.energystar.gov
HPCX-50L 1**0.949923798667November 13, 2024data.energystar.gov
ATHR-199M 1**0.951982870544December 18, 2023data.energystar.gov
ATHR-180M 1**0.951972866539December 18, 2023data.energystar.gov
ATHR-180X3 1**0.951972866538December 18, 2023data.energystar.gov
GT15THR-180M 1**0.951972862529December 18, 2023data.energystar.gov
GT15THR-180X3 1**0.951972862528December 18, 2023data.energystar.gov
ATHR-199X3 1**0.951982862504December 18, 2023data.energystar.gov
GT15THR-199M 1**0.951982862498December 18, 2023data.energystar.gov
GT15THR-199X3 1**0.951982862496December 18, 2023data.energystar.gov
ATHR-160M 1**0.951982862492December 18, 2023data.energystar.gov
ATHR-160X3 1**0.951982862491December 18, 2023data.energystar.gov
GT15THR-160M 1**0.951982862483December 18, 2023data.energystar.gov
GT15THR-160X3 1**0.951982862481December 18, 2023data.energystar.gov
ATO-240H 1**0.95Not listedNot listed2408815February 23, 2023data.energystar.gov
ATO-240H 1*10.95Not listedNot listed2408814February 23, 2023data.energystar.gov
GT15-240-NO 1**0.95Not listedNot listed2408813February 23, 2023data.energystar.gov
GT15-240-PO 1*10.95Not listedNot listed2408812February 23, 2023data.energystar.gov
GT15-340-NI 1**0.95Not listedNot listed2408799February 23, 2023data.energystar.gov
GT15-340-PI 1*10.95Not listedNot listed2408798February 23, 2023data.energystar.gov
ATI-340H 1**0.95Not listedNot listed2408797February 23, 2023data.energystar.gov
ATI-340H 1*10.95Not listedNot listed2408796February 23, 2023data.energystar.gov
ATO-540HX3-N 1**0.95Not listedNot listed2408781February 23, 2023data.energystar.gov
ATO-540HX3-P 1*10.95Not listedNot listed2408780February 23, 2023data.energystar.gov
GC6-PS4050*V 1**0.938912408767February 23, 2023data.energystar.gov
GC6-PS5065*V 1**0.949922408762February 23, 2023data.energystar.gov
ATI-340HX3-N 1**0.95Not listedNot listed2408752February 23, 2023data.energystar.gov
ATI-340HX3-P 1*10.95Not listedNot listed2408751February 23, 2023data.energystar.gov
ATO-240HX3-N 1**0.95Not listedNot listed2408741February 23, 2023data.energystar.gov
ATO-240HX3-P 1*10.95Not listedNot listed2408740February 23, 2023data.energystar.gov
GPHE-50 1**0.8848932408714February 23, 2023data.energystar.gov
GSP-100 2**0.933952408701February 23, 2023data.energystar.gov
GDHE-50 3**0.8849952408697February 23, 2023data.energystar.gov
GDHE-75 3**0.8674962408696February 23, 2023data.energystar.gov
ATO-540H 1**0.95Not listedNot listed2408684February 23, 2023data.energystar.gov
ATO-540P-N 1**0.95Not listedNot listed2408683February 23, 2023data.energystar.gov
ACT-199O-N 1**0.95Not listedNot listed2408682February 23, 2023data.energystar.gov
GT15-540-NO 1**0.95Not listedNot listed2408681February 23, 2023data.energystar.gov
ATO-540H 1*10.95Not listedNot listed2408680February 23, 2023data.energystar.gov
ATO-540P-P 1*10.95Not listedNot listed2408679February 23, 2023data.energystar.gov
ACT-199O-P 1*10.95Not listedNot listed2408678February 23, 2023data.energystar.gov

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Updated November 4, 2026. Read from ENERGY STAR certified product data, US Environmental Protection Agency (data.energystar.gov). Public domain data from the US EPA and the US Department of Energy. Products are listed as the EPA publishes them on the date this page was read, and the EPA can revise or withdraw a certification. A product is counted once, under the most specific list that holds it. For heat pumps each ENERGY STAR ID is one outdoor and indoor unit combination, so a model number can repeat. Brand names are as published. This page uses EPA data and is not endorsed or certified by the EPA or ENERGY STAR. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.