UL 174

Standard for Safety, Household Electric Storage Tank Water Heaters

Published by UL Standards & Engagement (UL)

The CFR incorporates UL 174 by reference, which makes the edition it names part of the regulation. The CFR requires the edition it names, which may not be the newest. To enforce any other edition, the agency must publish the change in the Federal Register.

The 3 editions the CFR requires

Different parts name different editions; each applies where its part says so. Newest first.

UL 174, Eleventh Edition, dated April 29, 2004, including revisions through December 15, 2016

As the CFR lists it: “UL 174, Standard for Safety, Household Electric Storage Tank Water Heaters, Eleventh Edition, dated April 29, 2004, including revisions through December 15, 2016 (“UL 174”)”

UL 174-1989, as amended through June 23, 1994

As the CFR lists it: “UL 174-1989, Household Electric Storage Tank Water Heaters, as amended through June 23, 1994”

UL 174-1989, June 23, 1994, Household Electric Storage Tank Heaters

As the CFR lists it: “UL 174-1989, as amended through June 23, 1994, Household Electric Storage Tank Heaters (“UL 174”)”

How to read it

A free or purchased copy may not be the edition the CFR names; check it against the edition above. Every incorporated standard can also be inspected at the National Archives (NARA) and at the agency named in the section that lists it.

UL 174 is copyrighted by its publisher; RegKnot shows its title and the editions the CFR names, not its text. Read from the eCFR's incorporation-by-reference sections, current as of October 26, 2026. The regulation text governs. All standards the CFR requires.