10 CFR § 431.156 - Energy and water conservation standards and effective dates.
---
identifier: "/us/cfr/t10/s431.156"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 431.156 - Energy and water conservation standards and effective dates."
title_number: 10
title_name: "Energy"
section_number: "431.156"
section_name: "Energy and water conservation standards and effective dates."
chapter_name: "DEPARTMENT OF ENERGY"
subchapter_number: "D"
subchapter_name: "ENERGY CONSERVATION"
part_number: "431"
part_name: "ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 6291-6317; 28 U.S.C. 2461 note."
regulatory_source: "64 FR 54141, Oct. 5, 1999, unless otherwise noted."
cfr_part: "431"
---
# 431.156 Energy and water conservation standards and effective dates.
(a) Each commercial clothes washer manufactured on or after January 8, 2013, and before January 1, 2018, shall have a modified energy factor no less than and a water factor no greater than:
| Equipment class | Modified energy factor (MEF), | Water factor (WF), |
| --- | --- | --- |
| Top-Loading | 1.60 | 8.5 |
| Front-Loading | 2.00 | 5.5 |
(b) Each commercial clothes washer manufactured on or after January 1, 2018 shall have a modified energy factor no less than and an integrated water factor no greater than:
| Equipment class | Modified energy factor (MEF), | Integrated Waterfactor (IWF), |
| --- | --- | --- |
| Top-Loading | 1.35 | 8.8 |
| Front-Loading | 2.00 | 4.1 |
[76 FR 69123, Nov. 8, 2011, as amended at 79 FR 74541, Dec. 15, 2014; 81 FR 20529, Apr. 8, 2016]