RULE4308 BOILERS, STEAM GENERATORS, AND PROCESS HEATERS - 0.075 

MMBtu/hr to 2.0 MMBtuIhr (Adopted October 20,2005) 

1.0 Purpose 

The purpose of this rule is to limit emissions of oxides of nitrogen (NOx) from boilers, 

steam generators, process heaters and water heaters. 

2.0 Applicability 

This rule applies to any person who supplies, sells, offers for sale, installs, or solicits the 

installation of any new small boiler, steam generator, process heater or water heater with a 

rated heat input capacity greater than or equal to 75,000 British thermal units per hour and 

up to but not including 2,000,000 British thermal units per hour. 

3.0 Definitions 

3.1 APCO: the Air Pollution Control Officer of the San Joaquin Valley Unified Air 

Pollution Control District, or any person authorized to act on behalf of the APCO. 

3.2 Boiler or Water Heater: any external combustion equipment fired with any liquid or 

gaseous fuel to produce hot water or steam. 

3.3 British Thermal Unit (Btu): the amount of heat required to raise the temperature of 

one pound of water from 59OF to 60°F at one atmosphere. 

3.4 District: as defined in Rule 1020 (Definitions). 

3.5 Heat Output: the enthalpy of the working fluid output of the unit. 

3.6 Higher Heating Value (hhv): the total heat liberated per mass of fuel burned (Btu 

per pound), when fuel and dry air at standard conditions undergo complete 

combustion and all resulting products are brought to their standard states at standard 

conditions. 

3.7 Humidifier: a device or system that uses an air stream heated by a direct contact 

combustion process in combination with a water spray to produce warm air of high 

humidity in order to maintain or increase the moisture content of the material being 

processed or conveyed by the air stream. 

3.8 Manufactured Home: as defined in 42 United States Code Section 5402 and 

California Health and Safety Code Section 18007. 

3.9 NOx Emissions: the sum of oxides of nitrogen (NOx) in the flue gas, collectively 

expressed as nitrogen dioxide. 

3.10 Process Heater: any combustion equipment fired on gaseous or liquid fuel, which 

transfers heat from combustion gases to water or process streams. Process heaters 

SJVUAPCD 4308 - 1 10/20/05 
exclude kilns or ovens used for drying, balung, cooking, calcining, heat treating or 

vitrifying. 

3.1 1Unit: any boiler, process heater, or water heater as defined in this rule. 

4.0 Exemptions 

The provisions of this rule shall not apply to: 

4.1 Units installed in manufactured homes and 

4.2 Humidifiers, where the products of combustion come into direct contact with the 

material to be heated. 

5.0 Requirements 

5.1 A person shall not supply, sell, offer for sale, install or solicit the installation of 

any boiler, process heater or water heater unless it has certified emissions 

complying with Table 1.0: 

Table 1.0 

+3&etJHeakeY;~~ 

Heat Input Capacity 

(MMB tulhr) 

Greater than or equal to 

0.075 MMBtuhr but 

less than or equal to 0.4 

MMB tar 

6.0 Administrative Requirements 

6.1 Emission Certification 

Greater than 0.4 

MMBtu/hr but less than 

2.0 MMB tulhr 

-- Deleted: <hq 1 

NOx Limit 

0.093 lbs of NOxIMMBtu 

of heat output at 3% stack 

gas oxygen by volume on a 

dry basis. 

SJ WAPCD 

CO Limit 

Not Applicable. 

lbs of 

of heat input at 3% stack 

gas oxygen by volume on a 

dry basis. 

400 ppm at 3% stack 

gas oxygen by volume 

on a dry basis. 
6.1.1 Certified emissions levels shall be demonstrated by an emission certification 

approved under either of the following: 

6 .l. 1.1 The District's certification program as described in Section 6.2 of 

this rule. 

6.1.1.2 The South Coast Air Quality Management Dismct Certification 

List for Rule 1146.2. 

6.1.1.3 Other emission certification programs approved by the EPA and 

APCO. 

6.2 District Certification Program 

6.2.1 For each model to be certified, the manufacturer shall obtain from an 

independent testing laboratory, a certification source test verifying 

compliance with the emission limits in Section 5.0. The results should be 

submitted with the compliance report information in Section 6.3. 

6.2.2 Source tests shall be conducted on a randomly selected unit no more than 

90 days prior to the date of proposed certification of the model by the 

District. 

6.2.3 Tests shall be conducted and reports shall be prepared according to the 

"Nitrogen Oxides Emissions Compliance Testing for Natural Gas-Fired 

Water Heaters and Small Boilers," Protocol, South Coast Air Quality 

Management District, Source Testing and Engineering Branch, Applied 

Science and Technology. 

6.2.4 District certification shall be valid for three years from the date of 

certification. 

6.2.5 The District shall publish and maintain a list of certified emissions for the 

tested unit. 

6.3 Compliance Report 

6.3.1 The compliance report shall contain the following information: 

SJWAPCD 
6.3.1.1 General Information: 

6.3.1.1.1 Name and address of manufacturer, 

6.3.1.1.2 Brand name. 

6.3.1.1.3 Model number, as it appears on the permanent 

nameplate, and 

6.3.1.1.4 Description of the model being certified, including 

burner type and rated heat input capacity. 

6.3.1.2 A report on the certification test specified in Section 6.2.3. 

6.3.1.3 A signed and dated statement attesting, under penalty of perjury, 

to the accuracy of all statements and information in the 

compliance report. 

6.4 Identification of Compliant Units 

The manufacturer shall display the model number and the certification status, as 

determined in Section 6.1 and 6.2 of this rule, of an applicable unit on the 

permanent nameplate. If packaging obscures the permanent nameplate, the model 

number and certification status shall also appear on the packaging. 

7.0 Compliance Schedule 

On and after January 1, 2007, no person shall supply, sell, offer for sale, install or solicit 

the installation of a unit subject to this rule unless it meets the requirements of Section 5.1. 

SJVUAPCD