16 CFR Part 305, Appendix D1 — Appendix D1 To Part 305—Water Heaters—Gas
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Capacity(first hour rating in gallons) | Range of estimated annualenergy costs(dollars/year) |
|---|---|
| Natural gas($/year) | Propane($/year) |
| Low | High | Low | High |
| “Very Small”—less than 18 | (*) | (*) | (*) | (*) |
| “Low”—18 to 50.9 | 162 | 172 | (*) | (*) |
| “Medium”—51 to 74.9 | 179 | 235 | 361 | 476 |
| “High”—75 and over | 227 | 336 | 460 | 679 |
(*) No data.
[88 FR 1136, Jan. 9, 2023]