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Boilers and Heaters

​A boiler or steam generator is any external combustion equipment, fired with any fuel, used to produce hot water or steam. Process heaters include any unit fired with any fuel which transfers heat from combustion gases to water or process streams, including reformers. 

Dryers in which the material being dried is in direct contact with the products of combustion, cement or lime kilns, glass melting furnaces, or smelters, are not considered process heaters. Please see Drying Ovens.

Who Needs a Permit?

  • A permit is required for all boilers, process heaters and steam generators with a rated heat input capacity of 1 million BTU per hour or greater or boilers, process heaters and steam generators of any size that are not fired exclusively on purchased quality natural gas, liquid petroleum gas, or any combination thereof.

  • Each boiler, heater or process heater will be permitted individually if rated at 1 million BTU per hour or greater.  

  • A permit is required if the aggregate rated heat input capacity of all boilers, process heaters and steam generators used in the same process is 1 million BTU per hour or greater.

  • Regardless of the aggregate heat input, individual boilers or water heaters rated at under 1 million BTU per hour are subject to Rule 414.

Permit Fees 

New Installations: 

  • Use Schedule 2 (see Rule 301, Section 308.3).  Fees are based on the design fuel consumption.   Use the Initial Permit Fee column for new installations or equipment not previously permitted.


  • For modifications of permitted equipment resulting in an increase in boiler rating, the fee is assessed in accordance with fee schedule 2 (see Rule 301, Section 308.3)based on the incremental increase in BTU/hr resulting from such change.

  • For modifications resulting in no increase in rating, the fee shall be based on Rule 301, Section 306.2.

Equipment Installed Without an Authority to Construct: 

  • As per Section 302.1 of Rule 301, any person installing/operating regulated equipment without obtaining a permit from the Sac Metro Air District first, will be required to pay permit renewal back fees for each year of unpermitted operation, to a maximum of 3 years, in addition to the initial permit fee. 

Permit Application Completeness Determination

An application will not be accepted for processing until it is deemed complete. The following will be required in order for the Sac Metro Air District to make a completeness determination.

  • Completed application Forms G100, G101B100 and HRA100. with the original signature of the owner/proprietor or responsible officer of the company.

  • Applicable permit fee in accordance with Rule 301.

  • Any additional information that may be requested in order to perform a health risk assessment or to better understand the process or the applicability of regulations.


 Documents / Forms

Related Rules

Rule Date Last Amended
Permitting Page
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