SACAQMD RULE 414 NATURAL GAS-FIRED WATER HEATERS
LAST REVISED 08/01/96


RULE 414 NATURAL GAS-FIRED WATER HEATERS

Adopted 08-01-96

INDEX



100 GENERAL

200 DEFINITIONS

300 STANDARDS

400 ADMINISTRATIVE REQUIREMENTS



500 MONITORING AND RECORD KEEPING


100 GENERAL

101 - PURPOSE: To limit the emission of nitrogen oxides (NOx) from natural gas-fired water heaters.

102 - APPLICABILITY: This rule shall apply to any person who manufactures, distributes, offers for sale, sells, or installs any natural gas-fired water heater with a rated heat input capacity less than 75,000 British thermal units per hour (Btu/hr), for use in this District.

110 - EXEMPTION, LARGE WATER HEATERS: This rule shall not apply to water heaters with a rated heat input of 75,000 Btu/hr or greater.

111 - EXEMPTION, WATER HEATERS IN RECREATIONAL VEHICLES: This rule shall not apply to water heaters used in recreational vehicles.

112 - EXEMPTION, WATER HEATERS IN SWIMMING POOLS AND HOT TUBS: This rule shall not apply to water heaters used exclusively to heat swimming pools and hot tubs.

113 - EXEMPTION, WATER HEATERS USING A FUEL OTHER THAN NATURAL GAS: This rule shall not apply to water heaters using any fuel other than natural gas.


200 DEFINITIONS

201 - BRITISH THERMAL UNIT (Btu): The amount of heat required to raise the temperature of one pound of water from 59F to 60F at one atmosphere.

202 - HEAT INPUT: The actual amount of heat released by natural gas burned in a water heater.

203 - HEAT OUTPUT: The product Ho as defined in Section 404.

204 - MOBILE HOME WATER HEATER: A natural gas-fired water heater manufactured exclusively for mobile home use.

205 - NATURAL GAS: A mixture of gaseous hydrocarbons containing at least 80 percent methane by volume as determined according to American Standard Test Method (ASTM) D1945-64.

206 - NATURAL GAS-FIRED WATER HEATER: A closed vessel in which water is heated by the combustion of natural gas and is withdrawn for use external to the vessel at pressures not exceeding 160 psig, including the apparatus by which heat is generated and all controls and devices necessary to prevent water temperatures from exceeding 210F (99C).

207 - RATED HEAT INPUT CAPACITY: The heat input capacity specified on the nameplate of the combustion unit. If the combustion unit has been altered or modified such that its maximum heat input is different than the heat input capacity specified on the nameplate, the new maximum heat input shall be considered as the rated heat input capacity.

208 - RECREATIONAL VEHICLE: A motor home, travel trailer, truck camper, or camping trailer, with or without motive power, designed for human habitation for recreational, emergency, or other occupancy, which meets all of the following criteria: 1) contains less than 320 square feet of internal living room area, excluding built-in equipment, including, but not limited to wardrobe, closets, cabinets, kitchen units or fixtures, and bath or toilet rooms; 2) it contains 400 square feet or less of gross area measured at maximum horizontal projections; 3) it is built on a single chassis; and 4)it is either self propelled, truck mounted, or permanently towable on the highways without a permit.


300 STANDARDS

301 - NITROGEN OXIDES EMISSION LIMIT: A person shall only distribute, offer for sale, sell, or install within the Sacramento Metropolitan Air Quality Management District either of the following:




400 ADMINISTRATIVE REQUIREMENTS

401 - COMPLIANCE SCHEDULE: Effective March 1, 1997, no person shall distribute, offer for sale, sell, or install any natural gas-fired water heater which does not comply with the requirements of Section 300.

402 - CERTIFICATION REQUIREMENT:

403 - MANUFACTURERS' LABELING REQUIREMENT: A manufacturer shall display the model number of the water heater complying with Section 300 on the shipping carton and on the rating plate of each water heater unit. The manufacturer shall also display the certification status on the shipping carton and on the water heater.

404 - CALCULATION FOR DETERMINATION OF HEAT OUTPUT: Heat output is computed using the following equation, as contained in the Protocol:

H = MCpi(Tdel - Tin) + VstDnCp2(Tmax - T)

405 - CALCULATION FOR DETERMINATION OF STORAGE TANK CAPACITY: Storage tank capacity is computed by the following equation:

Vst = (Wf - Wt)/Ds


500 MONITORING AND RECORD KEEPING

501 - TESTING PROCEDURE: Any natural gas-fired water heater distributed, offered for sale, sold, or installed within the District shall be tested in accordance with the South Coast Air Quality Management District Protocol: Nitrogen Oxides Emission Compliance Testing for Natural Gas-Fired Water Heaters and Small Boilers, January 1995.

502 - DURATION OF RECORDS: A manufacturer shall keep test reports and certification records for as long as the water heater model is offered for sale or sold in the District, or for three calendar years after manufacture, whichever is longer. These records shall be made available to the Air Pollution Control Officer upon request.