# 10 C.F.R. § 431.106 (2026): Uniform test method for the measurement of energy efficiency of commercial water heating equipment

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_106

## Section

- **Citation:** 10 C.F.R. § 431.106 (2026)
- **Heading:** Uniform test method for the measurement of energy efficiency of commercial water heating equipment
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 10 CFR: Energy / Chapter II: DEPARTMENT OF ENERGY / Part 431: ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT / Subpart G: Commercial Water Heaters, Hot Water Supply Boilers and Unfired Hot Water Storage Tanks / § 431.106: § 431.106   Uniform test method for the measurement of energy efficiency of commercial water heating equipment.

## Text

(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]

## Nearby sections

- [10 C.F.R. § 431.101 (2026) § 431.101   Purpose and scope.](https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_101.md)
- [10 C.F.R. § 431.102 (2026) § 431.102   Definitions concerning commercial water heaters, hot water supply boilers, unfired hot water storage tanks, and commercial heat pump water heaters.](https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_102.md)
- [10 C.F.R. § 431.105 (2026) § 431.105   Materials incorporated by reference.](https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_105.md)
- [10 C.F.R. § 431.106 (2026) § 431.106   Uniform test method for the measurement of energy efficiency of commercial water heating equipment.](https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_106.md)
- [10 C.F.R. § 431.110 (2026) § 431.110   Energy conservation standards and their effective dates.](https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_110.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_106. Check the current official text before relying on it. Not legal advice.