Appliance standards decide what mechanical contractors are allowed to install. That is the whole reason a bill about water heaters belongs in a construction publication.
Sen. Mike Lee, who chairs the Senate Committee on Energy and Natural Resources, introduced S.5338 on August 6. His office calls it the Energy Efficiency Reform Act of 2026. It has no cosponsors, and Congress hasn’t posted the text yet, so what follows comes from the committee’s own summary.
What the bill actually does
The mechanism is procedural, not a direct standards repeal. The bill would codify the Department of Energy’s Process Rule into statute and give DOE 270 days to finalize the version it proposed on July 7, 2026. Miss the deadline and the rules revert to the 2020 Process Rule.
DOE’s July proposal is where the numbers live. It would require a candidate standard to clear a 2 quadrillion Btu full-fuel-cycle savings threshold, or alternatively deliver 10 percent less energy use than existing products over 30 years, before the agency could impose it. Efficiency advocates argue that bar is high enough to stop essentially any new standard. Andrew deLaski of the Appliance Standards Awareness Project has been the loudest voice on that side.
The bill also removes the six-year statutory lookback that forces DOE to periodically revisit standards, adds criteria the agency must satisfy before creating a new product class, and strengthens federal preemption under EPCA so states cannot ban covered products by fuel source or emissions, or write their own standards where no federal one exists.
“Climate alarmism turned ordinary appliances into political targets,” Lee said in the committee release. The American Gas Association, whose president and CEO Karen Harbert issued a supporting statement, is on board.
The non-condensing question
The provision that will land hardest on jobsites concerns the 95 percent efficiency requirement for commercial gas water heaters and residential gas furnaces. That rule effectively eliminated non-condensing equipment, and it’s been in legal limbo since a Supreme Court ruling earlier this year sent it back for appellate review.
Engineers have spent two years writing specs on the assumption that condensing equipment is the only option, which drives venting, condensate drainage and combustion-air design in ways that ripple through a mechanical package. If non-condensing units come back, a lot of those decisions reopen, particularly on retrofits in older buildings where running a condensate line was the expensive part.
Preemption is the durable piece
The state preemption language will outlast any single administration, which is presumably why it’s being pushed as legislation rather than rulemaking. States including California, Washington and New York have been building electrification and fuel-source requirements into their energy codes. Blanket EPCA preemption on covered products would cut across that directly.
For a project team specifying long-lead mechanical equipment on an institutional job like UC Berkeley’s Undergraduate Academic Building, the practical advice is unglamorous: treat equipment availability as a live question again rather than a settled one, and don’t assume the code you’re designing to in 2026 is the code you’ll be inspected against in 2028.
A single-sponsor bill referred to committee is not law, and most aren’t going anywhere. This one’s sponsor chairs the committee it was referred to, which changes the odds.