ASHRAE-90.1-2022- - Page 120
Extracted Content
Table 6.8.1-6 Gas- and Oil-Fired Boilers—Minimum Efficiency Requirements
| Equipment Type a | Subcategory or Rating Condition | Size Category (Input) | Minimum Efficiency i | Efficiency as of 3/2/2022 | Test Procedure |
|---|---|---|---|---|---|
| Boilers, hot water | Gas fired h | <300,000 Btu/h f,g for applications outside U.S. i | 82%AFUE | 82%AFUE | 10 CFR 430 Appendix N |
| Boilers, hot water | Gas fired h | 300,000 Btu/h and 2,500,000 Btu/hd | 80%Et c | 80%Et c | 10 CFR 431.86 |
| Boilers, hot water | Gas fired h | >2,500,000 Btu/h d | 82%Ec b | 82%Ec b | 82%Ec b |
| Boilers, hot water | Oil fired e | <300,000 Btu/h f,g for applications outside U.S. i | 84%AFUE | 84%AFUE | 10 CFR 430 Appendix N |
| Boilers, hot water | Oil fired e | 300,000 Btu/h and 2,500,000 Btu/hd | 82%Et c | 82%Et c | 10 CFR 431.86 |
| Boilers, hot water | Oil fired e | >2,500,000 Btu/h d | 84%Ec b | 84%Ec b | 84%Ec b |
| Boilers, steam | Gas fired | <300,000 Btu/hf for applications outside U.S. i | 80%AFUE | 80%AFUE | 10 CFR 430 Appendix N |
| Boilers, steam | Gas fired— all, except natural draft | 300,000 Btu/h and 2,500,000 Btu/hd | 79%Et c | 79%Et c | 10 CFR 431.86 |
| Boilers, steam | Gas fired— all, except natural draft | >2,500,000 Btu/h d | 79%Et c | 79%Et c | 79%Et c |
| Boilers, steam | Gas fired— natural draft | 300,000 Btu/h and 2,500,000 Btu/hd | 77%Et c | 79%Et c | 79%Et c |
| Boilers, steam | Gas fired— natural draft | >2,500,000 Btu/h d | 77%Et c | 79%Et c | 79%Et c |
| Boilers, steam | Oil fired e | <300,000 Btu/h f for applications outside U.S. i | 82%AFUE | 82%AFUE | 10 CFR 430 Appendix N |
| Boilers, steam | Oil fired e | 300,000 Btu/h and 2,500,000 Btu/hd | 81%Et c | 81%Et c | 10 CFR 431.86 |
| Boilers, steam | Oil fired e | >2,500,000 Btu/h d | 81%Et c | 81%Et c | 81%Et c |
a. These requirements apply to boilers with rated input of 8,000,000 Btu/h or less that are not packaged boilers and to all packaged boilers . Minimum efficiency requirements for
boilers cover all capacities of packaged boilers . b. Ec = combustion efficiency (100% less flue losses). See reference document for detailed information. c. Et = thermal efficiency . See reference document for detailed information. d. Maximum capacity—minimum and maximum ratings as provided for and allowed by the unit’s controls. e. Includes oil-fired (residual). f. Boilers shall not be equipped with a constant burning pilot light. g. A boiler not equipped with a tankless domestic water-heating coil shall be equipped with an automatic means for adjusting the temperature of the water such that an incremental
change in inferred heat load produces a corresponding incremental change in the temperature of the water supplied. h. For new construction, refer to Section 6.4.1.1 for additional system compliance requirements. i. See Informative Appendix F, Table F-4, for U.S. minimum efficiencies for residential products covered by U.S. DOE requirements for U.S. applications.
118 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)