10 CFR § 431.106 - Uniform test method for the measurement of energy efficiency of commercial water heating equipment.

---
identifier: "/us/cfr/t10/s431.106"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 431.106 - Uniform test method for the measurement of energy efficiency of commercial water heating equipment."
title_number: 10
title_name: "Energy"
section_number: "431.106"
section_name: "Uniform test method for the measurement of energy efficiency of commercial water heating equipment."
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: "2026-04-05"
last_updated: "2026-04-05"
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"
---


# 431.106 Uniform test method for the measurement of energy efficiency of commercial water heating equipment.

(a) *Scope.* This section contains test procedures for measuring, pursuant to EPCA, the energy efficiency of commercial water heating equipment.

(b) *Testing and calculations.* Determine the energy efficiency of commercial water heating equipment by conducting the applicable test procedure(s):

(1) *Residential-duty commercial water heaters.* Test in accordance with appendix E to subpart B of part 430 of this chapter.

(2) *Commercial water heating equipment other than residential-duty commercial water heaters.* Test in accordance with the appropriate test procedures in appendices to subpart G of this part.

(i) *Gas-fired and oil-fired storage water heaters and storage-type instantaneous water heaters.* Test according to appendix A to subpart G of this part.

(ii) *Electric storage water heaters and storage-type instantaneous water heaters.* Test according to appendix B to subpart G of this part.

(iii) *Gas-fired and oil-fired instantaneous water heaters and hot water supply boilers (other than storage-type instantaneous water heaters).* Test according to appendix C to subpart G of this part.

(iv) *Electric instantaneous water heaters (other than storage-type instantaneous water heaters).* Test according to appendix D to subpart G of this part.

(v) *Commercial heat pump water heaters.* Test according to appendix E to subpart G of this part.

[81 FR 79322, Nov. 10, 2016]