`

Agenda Date: October 20, 2011

Agenda Placement: Regular

Estimated Time: 15 Minutes

Continued Item: No

Board Agenda Item

TO: Air Pollution Control District Board

FROM: Dave Van Mullem, Air Pollution Control Officer

CONTACT: Rebecca Armstrong, 961-8888

SUBJECT: Proposed Amended Rule 352, Natural Gas-Fired Fan-Type Central 

Furnaces and Small Water Heaters

 

RECOMMENDATION:

1. Hold a public hearing to receive testimony on proposed amended Rule 352.

2. Approve the Resolution attached to this Board Letter. Approval of the resolution will 

result in the following actions:

A. CEQA Findings: Adopt the CEQA findings (Attachment 1) pursuant to the 

California Environmental Quality Act (CEQA) and the CEQA guidelines.

B. Rule Findings: Adopt the associated rule findings (Attachment 2) in support of the 

proposed amended Rule 352 pursuant to Health and Safety Code Section 40727 

regarding necessity, authority, clarity, consistency, nonduplication, and reference. 

The rule findings also acknowledge public comments received on the proposed 

amended rule and adopt the Response to Comments (Attachment 3) as findings of the 

Board.

C. Rule Adoption: Adopt proposed amended Rule 352 (Attachment 4).

EXECUTIVE SUMMARY:

Santa Barbara County Air Pollution Control District’s (APCD) Rule 352, Natural GasFired Fan-Type Central Furnaces and Residential Water Heaters, regulates oxides of 

nitrogen (NOx) emissions from natural gas-fired central furnaces and small water heaters 

with a heat input rating less than 75,000 British thermal units (Btu) per hour. Rule 352 is 

a point-of-sale rule.
- 2-

The 2010 APCD Clean Air Plan (CAP) includes a commitment for the APCD to adopt a 

control measure for gas-fired small water heaters subject to Rule 352 by reducing the 

current NOx limit of 55 parts per million (ppm) to 15 ppm. Proposed amended Rule 352 

fulfills this commitment. The NOx emission limits for natural gas-fired fan-type central 

furnaces subject to Rule 352 will remain at 55 ppm.

DISCUSSION:

Background

The 2010 CAP calls for the adoption of CAP control measure N-XC-1 to further control

NOx emissions from natural gas-fired small water heaters with a heat input rating less 

than 75,000 Btu per hour. This control measure would reduce the current small water 

heater NOx limit of 55 ppm to 15 ppm.

The proposed emission limit revision for small water heaters is consistent with the limits 

already adopted by the South Coast Air Quality Management District, the Ventura 

County Air Pollution Control District and the San Joaquin Valley Unified Air Pollution 

Control District.

The emission limits for central furnaces subject to Rule 352 will remain unchanged at 55 

ppm.

Manufacturers have made water heaters which comply with the 15 ppm limit for almost 

four years. These compliant water heaters have been available in Southern California,

Ventura and San Joaquin Valley for some time now and some are already being sold in 

Santa Barbara County.

Rule 352 Revision

The primary objective of this rule revision project is to reduce small water heater NOx 

emissions limit from 55 ppm (approximately 40 nanograms per joule) to 15 ppm 

(approximately 10 nanograms per joule). The revision also adds a sell-through provision 

that enables distributors to sell existing water heaters that do not meet the 15 ppm limit 

until July 1, 2012.

APCD staff have revised the title to read “Small” water heaters instead of “Residential” 

water heaters. As a result, the revised new title is “Natural Gas-Fired Fan-Type Central 

Furnaces and Small Water Heaters”. This revision was made to include all water heaters 

of this size (i.e., residential and commercial) in order to have similar requirements as 

other surrounding Air Districts. Ventura County APCD revised their same size water 

heater rule last year and also revised their applicability to read “any/all” (as opposed to 

residential) water heaters.
- 3-

Staff have also proposed minor editorial revisions for clarity.

Implications for Sources

There are no small water heater manufacturers in Santa Barbara County. In order to 

comply with the South Coast Air Quality Management District and Ventura County Air 

Pollution Control District 15 ppm requirement, most manufacturers producing these 

water heaters have obtained certification from South Coast AQMD that their units meet 

the 15 ppm NOx emission limit. The amended Rule 352 will accept this certification.

Consequently, sources in Santa Barbara County that need to replace water heaters with 

new units will be able to purchase compliant units from vendors. This rule revision also 

does not require that existing units be immediately replaced upon adoption. Rule 352 

remains a point-of-sale rule and includes sell-through provision that enables distributors 

to sell and sources to install units which comply with the current 55 ppm NOx limit until 

July 1, 2012.

The APCD does not expect there will be any direct effect on the sources of Santa Barbara 

County due to this revision to Rule 352. 

Implications for APCD Budget

APCD staff will not incur additional routine or ongoing costs associated with this rule 

revision. This rule revision is being applied to an existing point-of-sale rule and will not 

create additional staff time and costs nor will it affect the APCD budget.

Comparison to Existing Federal Requirements

Pursuant to the Health and Safety Code Section 40727.2(a), the APCD is required to 

identify any and all existing federal air pollution control requirements that apply to the 

same equipment or source category as the rule proposed for adoption or modification by 

the APCD. Section 40727.2(a) also requires the APCD to identify any of the APCD’s 

existing or proposed rule and regulations that apply to the same equipment. 

There are no federal regulations that apply to natural gas small water heaters less than 

75,000 Btu per hour. Table 1, below, includes a list of the APCD rules and regulations 

that apply to the same equipment.
- 4-

Table 1. RULES THAT APPLY TO THE NATURAL GAS-FIRED WATER HEATERS 

SUBJECT TO RULE 352

GENERIC REQUIREMENTS AFFECTED 

EMISSION UNITS

BASIS FOR 

APPLICABILITY

Rule 201: Permits Required All emission units Emission of pollutants

Rule 202: Exemptions to Rule 201 Applicable emission 

units

Insignificant 

activities/emissions per 

size/rating/function

Rule 210: Fees All emission units Administrative

Rule 212: Emission Statements All emission units Administrative

Rule 302: Visible Emissions All emission units Particulate matter emissions

Rule 303: Nuisance All emission units Emissions that can injure, 

damage or offend.

Regulation VIII: New Source 

Review

All emission units Addition of new equipment or 

modification to existing 

equipment. Applications to 

generate ERC Certificates.

Regulation XIII (Rules 1301-

1305): Part 70 Operating Permits

All emission units A stationary source is a major 

source.

Emission Reductions

As a result of the proposed lower NOx emission limits, emission reductions will occur 

over time through the normal rate of replacement of old water heaters. The lifespan of 

these small water heaters ranges from 10 to 15 years. Staff estimates that the NOx 

emissions reduced by this rule change will be an additional 0.0867 tons per day (31.65

tons per year) in 2020 and 0.1653 tons per day (60.33 tons per year) in 2030.

Rulemaking Process and Schedule

Staff prepared the proposed amended Rule 352 and distributed it in July, 2011. 

APCD staff informed affected manufacturers, suppliers, installation specialists and 

associations of this proposed amended rule. The proposed amended Rule 352 was 

distributed via regular mail to those affected manufacturers, suppliers, and distributors of 

small water heaters. Additionally, staff posted this proposed amended Rule 352 on the 

APCD website.

Staff presented the proposed revisions for this rule to the Community Advisory Council 

(CAC) at their August 10, 2011 meeting. The CAC recommended that the Board adopt 

the proposed amended Rule 352. The motion passed with a vote of 14:0:0. 
- 5-

Public Review: Public Comments Submitted to Date

Attachment 3 contains written public comments received to date and staff responses. 

APCD staff has not received any public comments on this amended rule to date.

Cost-Effectiveness

The cost-effectiveness of air pollution control rules is generally specified in terms of cost 

of compliance per ton of emissions reduced. The South Coast AQMD estimated the costeffectiveness for the same control measure ranges from $2,979 to $9,292 per ton of NOx 

reduced (based on an incremental cost increase of $15 to $50 per unit).

With both Ventura County APCD and South Coast AQMD rules requiring 15 ppm water 

heaters, manufacturers already make units that comply with the proposed amended Rule 

352 NOx limit. Based on information provided by vendors and manufacturers of water 

heaters, and the fact that the limit in proposed amended Rule 352 is already being 

achieved in other nearby air districts, there should only be a minor increase in cost for 

compliant water heaters.

California Environmental Quality Act

The California Environmental Quality Act (CEQA) requires environmental review for the 

proposed amendments to Rule 352, Natural Gas-Fired Fan-Type Central Furnaces and 

Small Water Heaters.

The Santa Barbara County APCD is the lead agency on this project. Proposed 

amended Rule 352 has been examined in the Environmental Impact Report (EIR) for the 

2010 CAP which concluded that the implementation of revised Rule 352 would not result 

in any significant environmental impacts. 

The APCD finds that the 2010 CAP EIR may be used to fulfill the environmental review 

requirements of the current project. CEQA Guidelines section 15168(c)(2) allows 

subsequent activities to be approved without the need for a new environmental document 

if the impacts of those activities were examined in an EIR, and have no new effects or 

mitigation measures. District staff have evaluated the environmental impacts related to 

Proposed Amended Rule 352, and have concluded that the environmental impacts were 

adequately analyzed in the 2010 CAP EIR.

CEQA findings to be adopted by the APCD Board, as well as a discussion of these

findings, are provided in Attachment 1.

FISCAL IMPACT:

The APCD cost of implementing proposed amended Rule 352 will not change as a result 

of this rule revision. This is a point-of-sale rule and as a result, compliant water heaters
- 6-

will be purchased when existing units need replacement. This normal routine 

replacement of water heaters will not have any impact on the APCD’s budget. The

standard APCD fees for certification and/or source testing in Rule 210 will apply for 

manufacturers to pay for in-house staff review or compliance activities that may be 

necessary. 

SPECIAL INSTRUCTIONS:

Please send a certified minute order and signed resolution to Rebecca Armstrong of the

APCD for transmittal to the Air Resources Board.

CONCURRENCES:

County Counsel.

ATTACHMENTS:

Resolution

Attachment 1: CEQA Findings 

Attachment 2: Rule Findings

Attachment 3: Public Comments and Response to Public Comments

Attachment 4: Proposed Amended Rule 352
BOARD RESOLUTION

PROPOSED AMENDED RULE 352,

Natural Gas-Fired Fan-Type Central Furnaces and

Small Water Heaters

October 20, 2011

Santa Barbara County Air Pollution Control District

260 North San Antonio Road, Suite A

Santa Barbara, California 93110

(805) 961-8800
Santa Barbara County APCD

Resolution – Rule 352 - 1 - October 20, 2011

RESOLUTION OF THE AIR POLLUTION

CONTROL DISTRICT BOARD OF THE COUNTY OF 

SANTA BARBARA, STATE OF CALIFORNIA

In the Matter of ) APCD Resolution No. ___________

Adopting Proposed Amended Rule 352 )

_________________________________)

RECITALS

1. The Air Pollution Control District Board of the County of Santa Barbara 

(“Board”) is authorized to adopt, amend, or repeal rules and regulations pursuant to Health and 

Safety Code section 40725, et seq.

2. Pursuant to Health and Safety Code section 40001, the Board is required to 

adopt and enforce rules and regulations to achieve and maintain the state and federal ambient air 

quality standards.

3. The Board has determined that a need exists to amend Rule 352 (Natural GasFired Fan-Type Central Furnaces and Residential Water Heaters) for the purpose of the 2010 

Clean Air Act commitment.

NOW, THEREFORE, IT IS HEREBY RESOLVED THAT:

1) This Board has held a hearing and accepted public comments in accordance with 

the requirements of Health and Safety Code section 40725, et seq.

2) The California Environmental Quality Act (“CEQA”) findings set forth in 

Attachment 1 of the Board Package dated October 20, 2011 (herein after “Board Package”) are 

hereby adopted as findings of this Board pursuant to CEQA and the CEQA guidelines.

3) The general rule findings set forth in Attachment 2 of the Board Package are 

hereby adopted as findings of this Board pursuant to Health and Safety Code section 40727.

4) The Responses to Public Comments set forth in Attachment 3 of the Board 

Package are hereby adopted as findings of this Board.
Santa Barbara County APCD

Resolution – Rule 352 - 2 - October 20, 2011

5) Rule 352 as set forth in Attachment 4 of the Board Package is hereby adopted as a 

rule of the Santa Barbara County Air Pollution Control District pursuant to Health and Safety 

Code section 40725, et seq. 

6) The Board authorizes the Control Officer to transmit Rule 352 to the State Air 

Resources Board in compliance with applicable state and federal law. Additionally, the Board 

authorizes the Control Officer to do any other acts necessary and proper to obtain necessary 

approvals of the amended rule by the California Air Resources Board and the United States 

Environmental Protection Agency. 

PASSED AND ADOPTED by the Air Pollution Control District Board of the 

County of Santa Barbara, State of California, this 20th day of October, 2011, by the following 

vote:

AYES:

NOES:

 ABSTAIN:

 ABSENT:

ATTEST:

LOUIS D. VAN MULLEM, JR. _______________________________

CLERK OF THE BOARD Chair, Air Pollution Control

District Board of the County of

By____________________________ Santa Barbara

 Deputy

APPROVED AS TO FORM:

DENNIS MARSHALL

SANTA BARBARA COUNTY COUNSEL

By____________________________

Deputy

Attorneys for the Santa Barbara

Air Pollution Control District
ATTACHMENT 1

CEQA FINDINGS

PROPOSED AMENDED RULE 352,

Natural Gas-Fired Fan-Type Central Furnaces and 

Small Water Heaters

October 20, 2011

Santa Barbara County Air Pollution Control District

260 North San Antonio Road, Suite A

Santa Barbara, California 93110

(805) 961-8800
Santa Barbara County APCD 1-1 October 20, 2011

CEQA Findings – Rule 352

ATTACHMENT 1

CEQA FINDINGS

The Santa Barbara County Air Pollution Control District (District) found that the potential 

environmental impacts of revised Rule 352 were adequately described and analyzed in the EIR 

for the 2010 Clean Air Plan. 

The Board finds that:

• Pursuant to Section 15168 (c)(2) of the California Environmental Quality Act this 

rulemaking activity is within the scope of the 2010 Clean Air Plan Environmental Impact 

Report and the Environmental Impact Report adequately describes the activity for the 

purposes of the California Environmental Quality Act.

• Pursuant to Section 15168 (c)(2) of the California Environmental Quality Act, the 

revisions to Rule 352 were examined in the program Environmental Impact Report for 

the 2010 Clean Air Plan, and no new effects could occur and no new mitigation measures 

are required. Therefore, no new environmental document is required.

• The Environmental Impact Report for the 2010 Clean Air Plan was previously

determined by this Board to have been completed in compliance with the California 

Environmental Quality Act and was reviewed and considered by the Board prior to 

approval.

• Any subsequent changes to the project description during the public review period will 

undergo additional environmental review under the California Environmental Quality Act 

if it is determined that the changes are outside the scope of the 2010 Clean Air Plan 

Environmental Impact Report.
ATTACHMENT 2

RULE FINDINGS

PROPOSED AMENDED RULE 352,

Natural Gas-Fired Fan-Type Central Furnaces and

Small Water Heaters

October 20, 2011

Santa Barbara County Air Pollution Control District

260 San Antonio Road, Suite A

Santa Barbara, California 93110

(805) 961-8800

.
Santa Barbara County APCD 2-1 October 20, 2011

Rule Findings – Rule 352

ATTACHMENT 2

RULE FINDINGS FOR PROPOSED AMENDED RULE 352

Pursuant to California Health and Safety Code Section 40727, the Board makes the following 

findings for the adoption of Proposed Amended Rule 352, Natural Gas-Fired Central Furnaces 

and Small Water Heaters.

Necessity

The Board determines that it is necessary to adopt Proposed Amended Rule 352, Natural 

Gas-Fired Fan-Type Central Furnaces and Small Water Heaters to fulfill commitments in the 

SBCAPCD 2010 Clean Air Plan. 

Authority

The Board is authorized under state law to adopt, amend, or repeal rules and regulations pursuant 

to Health and Safety Code Section 40000, and 40725 through 40728 which assigns to local and 

regional authorities the primary responsibility for the control of air pollution from all sources 

other than exhaust emissions from motor vehicles. Additionally, pursuant to Health and Safety 

Code Section 40702, the District Board is required to adopt rules and regulations and to do such 

acts as are necessary and proper to execute the powers and duties granted to it and imposed upon 

it by State law.

Clarity

The Board finds that Proposed Amended Rule 352 is sufficiently clear. This rule was publicly 

noticed, and reviewed by the Community Advisory Council. The rule is written or displayed so 

that persons directly affected by it can easily understand its meaning.

Consistency

The Board determines that Proposed Amended Rule 352 is consistent with, and not in conflict 

with or contradictory to, existing federal or state statutes, court decisions, or regulations.

The air pollution control districts throughout the state of California that have water heater rules 

for this size of units have adopted similar rule revisions. Based on this evidence, the Board finds 

that the rules are consistent with neighboring air pollution control districts.

Nonduplication

The Board finds that Proposed Amended Rule 352, Natural Gas-Fired Fan-Type Central 

Furnaces and Small Water Heaters does not impose the same restrictions as any existing state or 

federal regulation, and the proposed rule is necessary and proper to execute the powers and 

duties granted to, and imposed upon, the District.
Santa Barbara County APCD 2-2 October 20, 2011

Rule Findings – Rule 352

Reference

The Board finds that we have authority under state law to adopt Rule 352 pursuant to Health and 

Safety Code Section 39002 which assigns to local and regional authorities the primary 

responsibility for the control of air pollution from all sources other than exhaust emissions from 

motor vehicles. Additionally, pursuant to Health and Safety Code Section 40702, the Board is 

required to adopt rules and regulations and to do such acts as are necessary and proper to execute 

the powers and duties granted to it and imposed upon it by state law.

Public Comment

Response to Comments

The Board has reviewed the response to comments included in Attachment 3 and hereby 

approves those responses to comments as findings.
ATTACHMENT 3

PUBLIC COMMENTS

and RESPONSE TO PUBLIC COMMENTS on

PROPOSED AMENDED RULE 352,

Natural Gas-Fired Fan-Type Central Furnaces and

Small Water Heaters

October 20, 2011

Santa Barbara County Air Pollution Control District

260 San Antonio Road, Suite A

Santa Barbara, California 93110

(805) 961-8800
Santa Barbara County APCD 3-1 October 20, 2011

Public Comments – Rule 352

ATTACHMENT 3

PUBLIC COMMENTS 

PROPOSED AMENDED RULE 352, NATURAL GAS-FIRED FAN-TYPE 

CENTRAL FURNACES AND SMALL WATER HEATERS

As of October 5, 2011, the District has received no public comments on this proposed amended

rule.
Santa Barbara County APCD 3-2 October 20, 2011

Response to Comments – Rule 352

ATTACHMENT 3 (continued)

DISTRICT RESPONSE TO PUBLIC COMMENTS 

PROPOSED AMENDED RULE 352, NATURAL GAS-FIRED FAN-TYPE

CENTRAL FURNACES AND SMALL WATER HEATERS

As of October 5, 2011, the District has received no public comments on this proposed amended

rule.
ATTACHMENT 4

PROPOSED AMENDED RULE 352,

Natural Gas-Fired Fan-Type Central Furnaces and

Small Water Heaters

October 20, 2011

Santa Barbara County Air Pollution Control District

260 San Antonio Road, Suite A

Santa Barbara, California 93110

(805) 961-8800
Santa Barbara County APCD Rule 352 352 - 1 [date of amended rule adoption]

RULE 352. NATURAL GAS-FIRED FAN-TYPE CENTRAL FURNACES AND RESIDENTIAL 

SMALL WATER HEATERS. (Adopted 9/16/1999, and [date of amended rule adoption])

A. Applicability

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

installation of any natural gas-fired fan-type central furnaces or residential water heaters for use within the 

District.

B. Exemptions

The provisions of this Rrule shall not apply to:

1. Units installed in manufactured housing (mobile homes).

2. Water heaters used exclusively in recreational vehicles.

3. Water heaters with a rated heat input of 75,000 British thermal units per hour or greater.

4. Water heaters used exclusively to heat swimming pools or hot tubs.

5. Fan-type central furnaces and residential water heaters using fuels other than natural gas.

C. Definitions

“Fan-Type Central Furnace” means a self-contained space heater providing for circulation of heated air 

at pressures other than atmospheric through ducts more than 10 inches in length that has a rated heat input 

capacity of less than 175,000 British thermal units per hour and, for combination heating and cooling units, 

a rated cooling capacity of less than 65,000 British thermal units per hour. 

“Heat Output (Central Furnace)” means the product obtained by multiplying the annual fuel utilization 

efficiency as defined by Section 10.1 of the Code of Federal Regulations (CFR), Title 10, Part 430, Subpart 

B, Appendix N, by the rated heat input capacity of the natural gas-fired central furnace. 

“Heat Output (Water Heater)” means the product obtained by multiplying the recovery efficiency as 

defined by Section 6.1.3 of 10 CFR 430, Subpart B, Appendix E, by the rated heat input capacity of the 

water heater. 

“Manufactured Home” has the same meaning as defined in 42 United States Code Section 5402 and 

California Health and Safety Code Section 18007.

“Natural Gas” means a mixture of gaseous hydrocarbons containing at least 80% methane by volume as 

determined by American Society for Testing and Materials ASTM Method D 1945-6403(2010), “Standard 

Test Method for Analysis of Natural Gas by Gas Chromatography,” ASTM International. 

“Rated Cooling Capacity” means the cooling capacity specified on the nameplate of the cooling unit. 

Cooling capacity is the amount of heat energy the cooling system can displace in one hour (British thermal 

units per hour). 

“Rated Heat Input Capacity” means the heat input capacity specified on the nameplate of the combustion 

unit. Heat input is the amount of energy consumed in one hour (British thermal units per hour). 

“Water Heater” means a device that heats water at a thermostatically-controlled temperature of no more 

than 210 degrees Fahrenheit for delivery on demand. 
Santa Barbara County APCD Rule 352 352 - 2 [date of amended rule adoption]

D. Requirements – General

1. Except as specified in Section D.2, Nno person shall supply, sell, offer for sale, install, or solicit 

the installation of any natural gas-fired fan-type central furnace or residential water heater for use 

within the District:

1a. With emissions of oxides of nitrogen in excess of 40 nanograms per joule (0.093 pounds 

of oxides of nitrogen per million British thermal units) of heat output, or 55 parts per 

million at 3.00 percent stack gas oxygen by volume on a dry basis, and.

2b. That is not certified in accordance with Section E.

2. After July 1, 2012, no person shall supply, sell, offer for sale, install, or solicit the installation of 

any natural gas-fired water heater for use within the District:

a. With emissions of oxides of nitrogen in excess of 10 nanograms per joule (0.023 pounds 

of oxides of nitrogen per million British thermal units) of heat output, or 15 parts per 

million at 3.00 percent stack gas oxygen by volume on a dry basis, and

b. That is not certified in accordance with Section E.

E. Requirements – Certification and Identification

1. Each appliance model shall be tested in accordance with Section F. In lieu of such certification 

tests, the District will accept certifications issued under El Dorado County Air Pollution Control 

District Rule 239; Kern County Air Pollution Control District Rule 424; Bay Area Air Quality 

Management District Regulation 9, Rule 6 or Regulation 9, Rule 4; Placer County Air Pollution 

Control District Rule 246; Sacramento Metropolitan Air Quality Management District Rule 414; 

San Diego County Air Pollution Control District Rule 69.5 or Rule 69.6; San Joaquin Valley 

Unified Air Pollution Control District Rule 4902; San Luis Obispo County Air Pollution Control 

District Rule 428; South Coast Air Quality Management District Rule 1111 or Rule 1121, Ventura 

County Air Pollution Control District Rule 74.11 or 74.22, or Yolo-Solano County Air Pollution 

Control District Rule 2.37.

2. The central furnace manufacturer and water heater manufacturer shall display the model number 

of the appliance complying with Section D.1 on the shipping carton and the rating plate of the 

appliance. 

3. Upon request of the Control Officer, each manufacturer shall submit to the District a statement 

confirming the appliance subject to this Rrule is in compliance with the emission limit specified in 

Section D.1. The statement shall be signed, dated, and shall attest to the accuracy of all 

information. The statement shall include: 

a. Name and address of manufacturer, and

b. Brand name, and

c. Model number, as it appears on the appliance rating plate, and

d. Heat input rating, British thermal units per hour, and

e. A source test report verifying compliance with the applicable emission limits in Section 

D.1.a or D.2.a.
Santa Barbara County APCD Rule 352 352 - 3 [date of amended rule adoption]

F. Monitoring – Source Testing

1. During testing, each tested central furnace shall be operated in accordance with the procedures 

specified in 10 CFR 430, Subpart B, Appendix N.

2. During testing, each water heater shall be operated in accordance with Section 2.4 of American 

National Standards ANSI Z21.10.1-1998 at normal pressure, input rates, and with a five-foot stack 

installed during the oxides of nitrogen emissions tests.

3. Compliance with the oxides of nitrogen emission requirement in D.1 shall be determined using Air 

Resources Board Method 100, or Environmental Protection Agency Methods 7E and 3A.

4. The following calculation shall be used to determine the nanograms of oxides of nitrogen per joule 

of heat output:

H C E

P U

N × ×

× × × =

4 4.566 10

where:

4.566 x 104 = unit conversion factor [parts per million (ppm) to nanograms and British thermal 

units to joules]

N = nanograms of emitted oxides of nitrogen per joule of heat output

P = concentration of oxides of nitrogen in flue gas in ppm by volume

U = dry volume percent of CO2 in flue gas necessary for stoichiometric combustion

H = gross heating value of fuel, British thermal units per cubic feet at 60°F and 30 inches of 

mercury

C = measured dry volume percent of CO2 in the flue gas, assuming complete combustion and no 

carbon monoxide present

E = efficiency, annual fuel utilization efficiency for natural gas-fired central furnaces or recovery 

efficiency for water heaters as referenced in the Section C definitions for heat output (central 

furnace) or heat output (water heater).

G. Rule Effective Date

This Rrule is effective on September 16, 1999[date of amended rule adoption].

APPROVED AS TO FORM:

DENNIS MARSHALL

SANTA BARBARA COUNTY COUNSEL

By____________________________

Deputy

Attorneys for the Santa Barbara

Air Pollution Control District