Equipment Typea | Subcategory or Rating Condition | Size Category (Input) | Minimum Efficiency | Test Procedurea |
Boilers, hot water | Gas-fired | < 300,000 Btu/hg,h for applications outside the U.S. | 82% AFUE | DOE 10 C.F.R. 430 Appendix N |
≥ 300,000 Btu/h and ≤ 2,500,000 Btu/he | 84% Etd | DOE 10 C.F.R. 431.86 | ||
> 2,500,000 Btu/h and ≤ 10,000,000 Btu/hb | 85% Etd | |||
> 10,000,000 Btu/hb | 82% Ecc | |||
Oil-firedf | < 300,000 Btu/hg,h | 84% AFUE | DOE 10 C.F.R. 430 Appendix N | |
≥ 300,000 Btu/h and ≤ 2,500,000 Btu/he | 87% Etd | DOE 10 C.F.R. 431.86 | ||
> 2,500,000 Btu/hb | 88% Ecc | |||
> 10,000,000 Btu/hb | 84% Ecd | |||
Boilers, steam | Gas-fired | < 300,000 Btu/hg | 81% AFUE | DOE 10 C.F.R. 430 Appendix N |
Gas-fired - all, except natural draft | ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/hb | 82% Etd | DOE 10 C.F.R. 431.86 | |
> 2,500,000 Btu/ha | 79% Etd | |||
> 10,000,000 Btu/hb | 79% Etd | |||
Gas-fired - natural draft | ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/hb | 81% Etd | ||
> 2,500,000 Btu/hb | 82% Etd | |||
> 10,000,000 Btu/hb | 79% Etd | |||
Oil-firedf | < 300,000 Btu/h | 82% AFUE | DOE 10 C.F.R. 430 Appendix N | |
≥ 300,000 Btu/h and ≤ 2,500,000 Btu/hb | 84% Etd | DOE 10 C.F.R. 431.86 | ||
> 2,500,000 Btu/hb | 85% Etd | |||
> 10,000,000 Btu/hb | 81% Etd |
For SI: 1 British thermal unit per hour = 0.2931 W. | ||||
a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | |||
b | 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. | |||
c | Ec | = | Combustion efficiency (100 percent less flue losses). | |
d | Et | = | Thermal efficiency. | |
e | Maximum capacity – Minimum and maximum ratings as provided for and allowed by the unit's controls. | |||
f | Includes oil-fired (residual). | |||
g | Boilers shall not be equipped with a constant burning pilot light. | |||
h | 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. | |||
i | This table is a replica of ASHRAE 90.1 Table 6.8.1-6 Gas- and Oil-Fired Boilers—Minimum Efficiency Requirements. | |||