---
kind: "section"
citation: "10 C.F.R. § 431.106"
title: "10"
number: "431.106"
heading: "Uniform test method for the measurement of energy efficiency of commercial water heating equipment."
url: "https://uscodex.org/cfr/10/431.106"
---

# §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](/cfr/10/part430-subpartB.md) 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.

## Notes

### Amendments

[81 FR 79322, Nov. 10, 2016]

### Source

Source: 69 FR 61983, Oct. 21, 2004, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 6291-6317; 28 U.S.C. 2461 note.

### Source

Source: 64 FR 54141, Oct. 5, 1999, unless otherwise noted.

### Amendments

[81 FR 79322, Nov. 10, 2016]