(a) Each commercial packaged boiler manufactured on or after January 1, 1994, and before March 2, 2012, must meet the following energy efficiency standard levels:
(1) For a gas-fired packaged boiler with a capacity (rated maximum input) of 300,000 Btu/h or more, the combustion efficiency at the maximum rated capacity must be not less than 80 percent.
(2) For an oil-fired packaged boiler with a capacity (rated maximum input) of 300,000 Btu/h or more, the combustion efficiency at the maximum rated capacity must be not less than 83 percent.
(b) Each commercial packaged boiler listed in Table 1 to Sec. 431.87 and manufactured on or after the effective date listed in Table 1 of this section, must meet the applicable energy conservation standard in Table 1.
Table 1 to Sec. 431.87--Commercial Packaged Boiler Energy Conservation Standards----------------------------------------------------------------------------------------------------------------
Efficiency level--
Equipment type Subcategory Size category (input) Effective date: March
2, 2012 *----------------------------------------------------------------------------------------------------------------Hot Water Commercial Packaged Gas-fired............... =300,000 Btu/ 80.0% ET
Boilers. h and <=2,500,000 Btu/
h.Hot Water Commercial Packaged Gas-fired............... 2,500,000 82.0% EC
Boilers. Btu/h.Hot Water Commercial Packaged Oil-fired............... =300,000 Btu/ 82.0% ET
Boilers. h and <=2,500,000 Btu/
h.Hot Water Commercial Packaged Oil-fired............... 2,500,000 84.0% EC
Boilers. Btu/h.Steam Commercial Packaged Boilers... Gas-fired--all, except =300,000 Btu/ 79.0% ET
natural draft. h and <=2,500,000 Btu/
h.Steam Commercial Packaged Boilers... Gas-fired--all, except 2,500,000 79.0% ET
natural draft. Btu/h.Steam Commercial Packaged Boilers... Gas-fired--natural draft =300,000 Btu/ 77.0% ET
h and <=2,500,000 Btu/
h.Steam Commercial Packaged Boilers... Gas-fired--natural draft 2,500,000 77.0% ET
Btu/h.Steam Commercial Packaged Boilers... Oil-fired............... =300,000 Btu/ 81.0% ET
h and <=2,500,000 Btu/
h.Steam Commercial Packaged Boilers... Oil-fired............... 2,500,000 81.0% ET
Btu/h.----------------------------------------------------------------------------------------------------------------* Where EC is combustion efficiency and ET is thermal efficiency as defined in Sec. 431.82.
(c) Each commercial packaged boiler listed in Table 2 to Sec. 431.87 and manufactured on or after the effective date listed in Table 2 of this section, must meet the applicable energy conservation standard in Table 2.
Table 2 to Sec. 431.87--Commercial Packaged Boiler Energy Conservation Standards----------------------------------------------------------------------------------------------------------------
Efficiency level--
Equipment type Subcategory Size category (input) Effective date: March
2, 2022 *----------------------------------------------------------------------------------------------------------------Steam Commercial Packaged Boilers.. Gas-fired--natural =300,000 Btu/h 79.0% ET
draft. and <=2,500,000 Btu/h.Steam Commercial Packaged Boilers.. Gas-fired--natural 2,500,000 Btu/h 79.0% ET
draft.----------------------------------------------------------------------------------------------------------------* Where EC is combustion efficiency and ET is thermal efficiency as defined in Sec. 431.82. [74 FR 36355, July 22, 2009]