Residential Water Heaters Specification Version 4.0

Version 4.0 ENERGY STAR specification for Water Heaters is currently under development. Materials related to this revision process are provided below. This process will encompass and supersede the ongoing Version 3.3 specification development process to add optional connected criteria. Materials related to the Version 3.3 revision can be referenced here. Partners and other interested parties with questions or concerns regarding these materials or the revision process can contact Abigail Daken, EPA, at or

Draft 1 Version 4.0 Specification & Draft 2 Test Method Webinar

 Please click here to view the webinar recording.

Please refer to the Version 3.3 Specification Revision Page for earlier documents related to the Connected Criteria development.