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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 1 **Chapter 150: C**  **ONTROL OF EMISSIONS FROM OUTDOOR WOOD**  **BOILERS**

SUMMARY: This regulation establishes particulate emission standards, siting criteria and labeling requirements for outdoor wood boilers , including outdoor pellet boilers

. 

### 1. **Applicability A.**  Thi s regulation applies statewide. **B.** This regulation applies to any manufacturer, supplier, distributor or person intending to sell, lease, distribute, or market, an outdoor wood boiler , including an outdoor pellet boiler, in the State of Maine that meets the definition of an outdoor wood boiler and to any person who installs, operates or owns an outdoor wood boiler , including an outdoor pellet boiler

. **C.** This regulation applies to outdoor wood boilers , including outdoor pellet boilers, with a rated thermal input of less than 3 MMBtu/hr. Boilers with a rated thermal heat input of 3 MMBtu/hr or greater are subj ect to Chapter 103 Fuel Burning Equipment Particulate Emission Standard of the Department’s Regulations. 

### 2. **Definitions** The following terms, as used in this Chapter, have the following meanings : **A .**  **Clean wood.** “Clean wood” mean s wood that has no paint, stain , or other types of coatings, and wood that has not been treated with, including but not limited to , copper chromium arsenate, creosote, or pentachlorophenol. **B .**  **Commercial outdoor wood**  **boiler .**  “Commercial outdoor wood boiler” means a ny outdoor wood boiler , except for those outdoor wood boilers used solely for space heating or domestic hot water, used to service a commercial establishment. **C .**  **Distrib ute or sell**  **.** “Distribute or sell” means to distribute, sell, advertise for sale, offer for sale, lease, ship, deliver for shipment, release for shipment, or receive and (having so received) deliver or offer to deliver. This term does not include the dist ribution or sale by a manufacturer of an outdoor wood boiler that is installed outside the State of Maine

. **D .**  **Manufacturer .**  “Manufacturer” means any person who constructs or imports for the distribution or sale into the United States an outdoor wood boil er . **E .**  **New outdoor wood boiler.**  “New outdoor wood boiler” means an outdoor wood boiler that is not installed and/or operational at the intended location of use as of the effective date of this Chapter. **F .**  **Nuisance .**  “Nuisance” means emission of air cont aminants to the outdoor atmosphere of such quantity, characteristic or duration that may be injurious to human, plant or animal life or to property, or that unreasonably interfere s with the comfortable enjoyment of life or property
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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 2 **G .**  **Opacity .**  “Opacity” means the degree to which emissions other than water reduce the transmission of light and obscure the view of an object in the background. **H .**  **Outdoor wood boiler**  **.** “Outdoor wood boiler” (also known as outdoor wood

- fired hydronic heater , water stove or outdoor wood furnace) means a fuel burning device that : (1) is designed to burn wood , biomass fuel products or other approved solid fuels; (2) the manufacturer specifies for outdoor installation or installation in structures not normally occupied by humans ( e.g., shed s ) or is an indoor

-rated device housed in a modular or containerized structure ; and (3) heats building space or water, or both, through the distribution, typically through pipes for a fluid or ducts for air , of a fluid or air heated in the device

. **I. Outdoor pellet boiler.**  “Outdoor pellet boiler” means an outdoor wood boiler designed and warranted by the manufacturer specifically to burn pellet fuel with metered fuel and air feed and controlled combustion engineering, which is operated according to the manufacturer’s specifications and burns only pellet fuel

. **J .**  **Particulate matter or PM .**  “Particulate matter or PM” means particulate matter PM 10 and PM 2.5 including the condensable fraction. **K .**  **Sale .**  “Sale” means the transfer of ownership or control. **3 .**  **Requirements for the Sale ,**  **Installation and Operation**  **of New Outdoor Wood Boilers**  **and Outdoor Pellet Boilers A.**  **Particulate Matter Emission Standards for Outdoor Wood Boilers** 

### (1) Phase I Particulate Emission Standard for Outdoor Wood Boilers and Outdoor Pellet Boilers . No person shall distribute or sell, lease, import, supply or install an outdoor wood boiler after April 1, 2008 or an outdoor pellet boiler after April 1, 2009 unless it has been certified under Section 3(E) to meet a particulate matter emission limit of 0.60 lb s /MMBtu heat input. Outdoor wood boilers and outdoor pellet boilers meeting the Phase I limit must be installed according to the applicable setback and stack height requirements as defined in Section 3(B) and 3(C) of this Chapter. (2) Phase II Particulate Emission Standard for Outdoor Wood Boilers and Outdoor Pellet Boilers . No person shall distribute or sell, lease, import, supply or install an outdoor wood boiler or outdoor pellet boiler after April 1, 2010 unless it ha s been certified under Section 3(E) to meet a particulate matter emission limit of 0.32 lb s /MMBtu heat output. Outdoor wood boilers and outdoor pellet boilers meeting the Phase II limit must be installed according to the applicable setback and stack height requirements as defined in Section 3(B) and 3(C) of this Chapter

. (3) Voluntary Technology

- forcing Particulate Emission Standard for Outdoor Wood Boilers. An outdoor wood boiler meeting a particulate matter emission limit of 0.06 lbs/MMBtu heat output is not subject to a setback requirement under this Chapter as long as it meets the stack height requirements described in Section 3(C)(3) of this Chapter.06

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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 3 **B. Setback Requirements for New Outdoor Wood Boilers**  **and Outdoor Pellet Boilers** (1) Outdoor wood b oilers and outdoor pellet boilers with particulate emission limits greater than 0.60 lbs/MMBtu heat input or with no certification. N o person shall install or allow the installation of any outdoor wood boiler or outdoor pellet boiler that has been certifi ed to meet a particulate emission limit greater than 0.60 lbs/MMBtu heat input or has no certification , determined in accordance with Section 3(E) of this Chapter, unless the outdoor wood boiler or outdoor pellet boiler is installed at least 250 feet from the nearest property line or at least 270 feet from the nearest dwelling that is not on the same property as the outdoor wood boiler or outdoor pellet boiler

. (2) Outdoor wood boilers and outdoor pellet boilers certified to meet particulate emission limit s of 0.60 lb s /MMBtu heat input. No person shall install or allow the installation of any outdoor wood boiler or outdoor pellet boiler that has been certified to meet a particulate matter emission limit of 0.60 lb s/MMBtu heat input, determined in accordanc e with Section 3(E) of this Chapter, unless the outdoor wood boiler or outdoor pellet boiler is installed at least 100 feet from the nearest property line or at least 120 feet from the nearest dwelling that is not on the same property as the outdoor wood b oiler or outdoor pellet boiler

. (3) Outdoor wood boilers and outdoor pellet boilers certified to meet particulate emission limits of 0.32 lb s /MMBtu heat output

. N o person shall install or allow the installation of any outdoor wood boiler or outdoor pelle t boiler that has been certified to meet a particulate matter emission limit of 0.32 lb s/MMBtu heat output, determined in accordance with Section 3(E) of this Chapter, unless the outdoor wood boiler or outdoor pellet boiler is installed at least 50 feet from the nearest property line or at least 70 feet from the nearest dwelling that is not on the same property as the outdoor wood boiler or outdoor pellet boiler

. (4) Outdoor pellet boilers certified to meet particulate emission limits of 0.06 lbs/MMBtu heat output
. No person shall install or allow the installation of any outdoor pellet boiler that has been certified to meet a particulate matter emission limit of 0.06 lbs/MMBtu heat output, determined in accordance with Section 3(E) of this Chapter, unless the outdoor pellet boiler is installed at least 20 feet from the nearest property line or at least 40 feet from the nearest dwelling that is not on the same property as the or outdoor pellet boiler. (5) Outdoor wood boilers that have been modified to burn pellets. Outdoor wood boilers that have been modified to burn pellets must meet the applicable setback specified in Section 3(B) of this Chapter for the original particulate emission limit certification of the outdoor wood boiler, determined in accordanc e with Section 3(E) of this Chapter

. **C. Stack**  **H eight Requirements for New Outdoor Wood Boilers**  **and Outdoor Pellet Boilers**  (1) Outdoor wood boilers and outdoor pellet boilers certified to meet particulate emissions limits of greater than 0.60 lbs/MMBtu he at input or with no certification.06

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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 4 (a) No person shall install or allow the installation of any outdoor wood boiler or outdoor pellet boiler that has been certified to meet a particulate emission limit of greater than 0.60 lbs/MMBtu heat input or has no c ertification, determined in accordance with Section 3(E) of this Chapter, unless the outdoor wood boiler or outdoor pellet boiler : (1) has an attached stack with a minimum stack height of 10 feet above ground level; or (2) has an attached stack extending two feet higher than the peak of the roof of the structure being served by the outdoor wood boiler or outdoor pellet boiler , if an abutting residence is located less than 500 feet from the outdoor wood boiler or outdoor pellet boiler

. (b) No person shall operate any outdoor wood boiler or outdoor pellet boiler , installed after the effective date of this Chapter, that has been certified to meet a particulate emission limit of greater than 0.60 lbs/MMBtu heat input or with no certification , determined in ac cordance with Section 3(E) of this Chapter, if an abutting residence is located less than 500 feet from the outdoor wood boiler or outdoor pellet boiler , unless the outdoor wood boiler or outdoor pellet boiler has an attached stack extending two feet higher than the peak of the roof of the structure being served by the outdoor wood boiler or outdoor pellet boiler

. (2) Outdoor wood boilers and outdoor pellet boilers certified to meet particulate emission limits of 0.60 lb s /MMBtu heat input. (a) No person s hall install or allow the installation of any outdoor wood boiler or outdoor pellet boiler that has been certified to meet a particulate matter emission limit of 0.60 lb s/MMBtu heat input, determined in accordance with Section 3(E) of this Chapter, unless the outdoor wood boiler or outdoor pellet boiler : (1) has an attached stack with a minimum stack height of 10 feet above ground level; or (2) has an attached stack extending two feet higher than the peak of the roof of the structure being served by the outdoor wood boiler or outdoor pellet boiler , if an abutting residence is located less than 300 feet from the outdoor wood boiler or outdoor pellet boiler

. (b) No person shall operate any outdoor wood boiler or outdoor pellet boiler , installed after the ef

fective date of this Chapter, that has been certified to meet a particulate emission limit of 0.60 lbs/MMBtu heat input, determined in accordance with Section 3(E) of this Chapter, if an abutting residence is located less than 300 feet from the outdoor woo d boiler or outdoor pellet boiler , unless the outdoor wood boiler or outdoor pellet boiler has an attached stack extending two feet higher than the peak of the roof of the structure being served by the outdoor wood boiler or outdoor pellet boiler

. (3) Outdoor wood boilers and outdoor pellet boilers certified to meet particulate emission limits of 0.32 lb s /MMBtu heat output.06

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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 5 (a) No person shall install or allow the installation of any outdoor wood boiler or outdoor pellet boiler that has been certified to meet a particulate matter emission limit of 0.32 lb s/MMBtu heat output, determined in accordance with Section 3(E) of this Chapter, unless the outdoor wood boiler or outdoor pellet boiler : (1) has an attached stack with a minimum stack height of 10 feet above ground level; or ( 2 ) has an attached stack extending two feet higher than the peak of the roof of the structure being served by the outdoor wood boiler or outdoor pellet boiler , if an abutting residence is located less than 300 feet from the outdoor wood boiler or outdoor pellet boiler

. (b) No person shall operate any outdoor wood boiler or outdoor pellet boiler , installed after the effective date of this Chapter, that has been certified to meet a particulate emission limit of 0.32 lb s/MMBtu heat out put , determined in accordance with Section 3(E) of this Chapter, if an abutting residence is located less than 300 feet from the outdoor wood boiler or outdoor pellet boiler , unless the outdoor wood boiler or outdoor pellet boiler has an attached stack ext ending two feet higher than the peak of the roof of the structure being served by the outdoor wood boiler or outdoor pellet boiler

. (4) Outdoor pellet boilers certified to meet particulate emission limits of 0.06 lbs/MMBtu heat output. (a) No person shal l install or allow the installation of any outdoor pellet boiler that has been certified to meet a particulate matter emission limit of 0.06 lbs/MMBtu heat output, determined in accordance with Section 3(E) of this Chapter, unless the outdoor pellet boiler : (1) has an attached stack with a minimum stack height of 10 feet above ground level; or (2) has an attached stack extending two feet higher than the peak of the roof of the structure being served by the outdoor pellet boiler, if an abutting residence i s located less than 100 feet from the outdoor pellet boiler. (b) No person shall operate any outdoor pellet boiler, installed after the effective date of this Chapter, that has been certified to meet a particulate emission limit of 0.06 lbs/MMBtu heat out

put, determined in accordance with Section 3(E) of this Chapter, if an abutting residence is located less than 100 feet from the outdoor pellet boiler, unless the outdoor pellet boiler has an attached stack extending two feet higher than the peak of the ro of of the structure being served by the outdoor pellet boiler. (5) Outdoor wood boilers that have been modified to burn pellets. Outdoor wood boilers that have been modified to burn pellets must meet the applicable stack height specified in Section 3( C ) of this Chapter for the original particulate emission limit certification of the outdoor wood boiler, determined in accordance with Section 3(E) of this Chapter.06

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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 6 ( 6 ) In the case that there is no structure (e.g. swimming pool or hot tub) being served by an outdoor wood boiler or outdoor pellet boiler subject to Section 3(C), the owner or operator of the outdoor wood boiler or outdoor pellet boiler shall extend the stack two feet higher than the peak of the roof of the nearest building to the outdoor wood bo iler or outdoor pellet boiler

. **D. Commercial Outdoor Wood Boiler**  **, Commercial Outdoor Pellet Boiler ,**  **Outdoor Wo**  **od Boiler or Outdoor Pellet Boiler**  **with a rated thermal output greater than**  **350,000 Btu/hr Analysis Requirement** ( 1 ) Any person intending to inst all or operate a commercial outdoor wood boiler , commercial outdoor pellet boiler , an outdoor wood boiler , or outdoor pellet boiler with a rated thermal output greater than 350,000 Btu/hr shall obtain an evaluation, report and installation recommendations performed by a qualified professional, including a licensed professional engineer or a master solid fuel burner technician , that includes the following information: ( a) What type of application will the outdoor wood boiler or outdoor pellet boiler be used for; (b) A determination of the heat load requirements of the facility as compared to the available heat supply of the outdoor wood boiler or outdoor pellet boiler to ensure the unit is properly sized; (c) The stack location relative to the property lines and building locations within 400 feet of the outdoor wood boiler or outdoor pellet boiler ; (d) The stack height ; and (e) Recommendation s for the proper outdoor wood boiler or outdoor pellet boiler installation, including but not limited to, hook

-up, auxiliary fuel, properly sized outdoor wood boiler or outdoor pellet boiler , stack height and stack location. ( 2 ) No person shall install or operate a commercial outdoor wood boiler , commercial outdoor pellet boiler , outdoor wood boiler or outdoor pellet boiler with a rated thermal output greater than 350,000 Btu/hr unless it is installed according to the recommendations of the evaluation report in Section 3( D ) ( 1)

. In any case, no person shall install or operate a commercial outdoor wood boiler , commercial outdoor pellet boiler , an outdoor wood boiler or outdoor pellet boiler with a rated thermal output greater than 350,000 Btu/hr unless it meets the minimum setback and stack height requirements stated in Section 3(B) and 3(C) of this Chapter

. **E .**  **Certification of Outdoor**  **Wood Boilers and Outdoor Pellet Boilers**  **.** No person shall supply, distribute, sell, lease, offer for sale, or allow the installation of an outdoor wood boiler or an outdoor pellet boiler in the State of Maine unless the outdoor wood boiler or outdoor pell et boiler has received certification pursuant to the EPA Outdoor Wood

- Fired Hydronic Heater Program. The certification shall demonstrate that the outdoor wood boiler or outdoor pellet boiler meets the applicable particulate emission standard in Section 3 (A) of this Chapter. T he manufacturer of any such outdoor wood boiler or outdoor pellet boiler shall conduct testing via the EPA Outdoor Wood

- Fired Hydronic Heater Phase I Program until EPA replaces the EPA Outdoor Wood

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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 7 Heater Phase I Program with the Environmental Technology Verification Program

. The Department may approve an alternative certification program. **F .**  **Sell**
**- through exemption**  **fo r Outdoor Wood Boilers**  **.** No person shall sell or offer for sale any outdoor wood boiler with a particul ate emission rate greater than 0.60 lbs/MMBtu heat input as certified in accordance with Section 3( E ) of this Chapter unless the outdoor wood boiler was purchased, paid for in full and received in the State of Maine before April 1, 2008 and the outdoor woo d boiler meets all of the applicable requirements of this Chapter. C ompliance with this Section must be demonstrated by keeping records of the purchase date and receipt date of their inventory as of the effective date of this Chapter. These records shall be kept for at least 5 years and shall be made available to the Department up on request. This exemption is effective until April 1, 2009

. **G .**  **Labeling Requirements.** New outdoor wood boilers and outdoor pellet boilers shall be labeled in accordance with the labeling requirements of the U.S. Environmental Protection Agency Outdoor Wood

- Fired Hydronic Heater Program . Requirements of this program are located at www.epa.gov/woodheaters/index.htm

. **H .**  **Rain Cap Prohibition .**  No person shall operate a new outdoo r wood boiler or outdoor pellet boiler using a rain cap unless this device is required by the manufacturer specifications

. **4 .**  **General Provisions and Requirements For All Outdoor Wood Boilers**  **and Outdoor Pellet Boilers**  **A .**  **Prohibited fuels.** No person shal l burn any of the following items in an outdoor wood boiler : ( 1 ) any wood that does not meet the definition of clean wood; ( 2 ) garbage; ( 3 ) tires; ( 4 ) lawn clippings or yard waste; ( 5 ) materials containing plastic; ( 6 ) materials containing rubber; ( 7 ) waste petroleum products; ( 8 ) paints and paint thinners; ( 9 ) chemicals; ( 1 0 ) glossy or colored papers; ( 1 1 ) construction and demolition debris; ( 1 2 ) plywood; ( 1 3 ) particleboard; ( 1 4 ) salt water driftwood and other previously salt

-water saturated mat erials ; ( 1 5 ) manure; ( 1 6 ) animal carcasses; ( 1 7 ) asphalt products ; (18) materials containing asbestos; (19) materials containing lead, mercury, or other heavy or toxic metals ; and (20) coal , unless the outdoor wood boiler is specifically designed to burn c oal.06

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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 8 **B. Fuel Requirements**  (1) No person that operates an outdoor wood boiler shall use a fuel other than the following: (a) Clean wood; (b) Wood pellets made from clean wood; ( c ) Home heating oil in compliance with the applicable sulfur content limit , propane or natural gas may be used as starter or supplemental fuels for dual

- fired outdoor wood boilers; and (d) Other fuels as approved by the Department. (2) No person that operates an outdoor pellet boiler shall use a fuel other than the following: (a) Woo d pellets made from clean wood; (b) Corn ; and (c) Other fuels as approved by the Department. **C. Visible Emission Standard**  **.** No person shall cause or allow the emission of a smoke plume from any outdoor wood boiler or outdoor pellet boiler to exceed an average of 3 0 percent opacity on a six minute block average basis, except for no more than two six minute block averages in a 3

-hour period . Opacity under this subsection shall be determined pursuant to EPA Method 9 Visual Determination of the Opacity of Emissions from Stationary Sources (40CFR60, Appendix A)

. **D. Enforcement and**  **Preemption.** This rule is subject to enforcement pursuant to 38 MRSA §347

-A. Nothing in Chapter 150 may be construed as pre

- empting any otherwise applicable , statute, regulation, l ocal ordinance or otherwise applicable private common law cause of action. 

### E **. Notice to Buyers**  (1) No outdoor wood boiler or outdoor pellet boiler subject to the requirements of this Chapter shall be offered, sold, offered for retail sale, or leased within the State of Maine unless prior to any sales or lease agreement, the seller or dealer provides the prospective buyer or lessee with a copy of this Chapter and a written notice that: ( a) Itis unlawful to burn garbage, treated or painted wood, plastic and plastic products, rubber products, yard waste, lawn clippings, glossy or colored papers, construction and demolition debris, materials containing asbestos, materials containing lead, mercury, or other heavy or toxic metals, plywood, particleboard, salt water driftwood and other previously salt water saturated materials , manure, animal carcasses, asphalt products, coal, unless the outdoor wood boiler is06

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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 9 specifically designed to burn coal, waste petroleum products, paints, chemicals or any substance that normally emits dense smoke or obnoxious odors; (b ) Installation of an outdoor wood boiler or outdoor pellet boiler may be subject to other applicable State and local stack height and setback requirements; ( c ) T he applicable distance and stack height requirements provided in Section 3(B) and 3(C) of this Chapter may not be adequate in some areas due to terrain that could render the operation of an outdoor wood boiler or outdoor pellet boiler to be a nuisance or public health hazard; and ( d) States the spec ific results of the average and maximum emission rates of particulate matter for the outdoor wood boiler or outdoor pellet in grams per hour per the testing determined in accordance with Section 3( E ) of this Chapter and the average delivered heating effici ency as found in the test reports that were used for certification of the units or a statement that the outdoor wood boiler or outdoor pellet boiler has not been tested or certified. (2) The written notice specified above shall be signed by the buyer or l essee at the time of purchase or lease to indicate receipt of notice . Said notice shall contain the name s ; address es ; telephone number of both the seller or dealer and the buyer or lessee; the location where the outdoor wood boiler or outdoor pellet boiler will be installed; and the make and model of the outdoor wood boiler or outdoor pellet boiler

. The dealer shall keep these records for 5 years and provide them to the Department upon request. **F .**  **Owner’s Manual.** Each outdoor wood boiler or outdoor pell et boiler offered for sale or lease must be accompanied by an owner’s manual that shall contain all the information listed below: (1) T hermal output capacity; (2) Proper installation information; (3) Operation and maintenance information to minimize emi ssions ; (4) Wood loading procedures, recommendations on wood selection, and warnings on improper fuels; (5) Fire starting procedures; (6) Proper use of air flow devices, if applicable; (7) Ash removal procedures; (8) For catalytic models, information pertaining to maintaining catalyst performance, maintenance procedures, procedures for determining catalyst failure or deterioration, procedures replacement, and information on warranty rights. (9) Language stating: Improper use or failure to maintain the outdoor wood boiler or outdoor pellet boiler may cause nuisance conditions. Persons operating this outdoor06

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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 10 wood boiler or outdoor pellet boiler are responsible for operation of the outdoor wood boiler or outdoor pellet boiler so as not to cause a nuisanc e condition. Even proper use and maintenance of the outdoor wood boiler or outdoor pellet boiler , and meeting the distance and stack height recommendations and requirements in State and local regulations may not always be adequate to prevent nuisance conditions in some areas due to terrain or other factors. **5 .**  **Nuisance Conditions A.**  **Standard.** No person shall operate an outdoor wood boiler or an outdoor pellet boiler, that produces visible emissions, measured as any opacity totaling twelve minutes in any hour , that cross onto any land or buildings immediately adjacent to a dwelling or commercial building not owned by the owner of the outdoor wood boiler. Opacity under this subsection shall be determined pursuant to EPA Method 22 Visual Determination of F ugitive Emissions from Material Sources and Smoke Emissions from Flares (40CFR60, Appendix A)

. **B. Prohibition.**  No person shall operate an outdoor wood boiler or an outdoor pellet boiler, in such a manner as to create a nuisance. **6 .**  **Third Party Sales** As of the e ffective date of this Chapter, an outdoor wood boiler or outdoor pellet boiler that has been owned by an individual and was in use in Maine prior to the effective date of this Chapter may be distributed or sold to another individual for his or her own personal use. The outdoor wood boiler or outdoor pellet boiler shall be subject to the applicable setback and stack height requirements specified in Section 3(B) and 3( C ) . If the particulate emission limit is not known, the outdoor wood boiler or outdoor pellet boiler must meet the setback and stack height requirements of Section 3(B)(1) and 3( C ) (1)

. **7 .**  **Effective date** Unless otherwise noted, compliance with all applicable provisions of this Chapter is the effective date of the regulation. **8. Severabil** **ity** Each Section of this Chapter shall be deemed severable, and in the event that any Section of this Chapter is held invalid, the remainder shall continue in full force and effect.

AUTHORITY: 38 M.R.S.A., § 585

-A , §610

- B EFFECTIVE DATE: November 9, 20 07

Amended: July 4, 2008

April 7, 2009 April 11, 2010

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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 11 **BASIS STATEMENT** In 1988 EPA established particulate emission standards for residential wood stoves sold in the United States after 1992. However, outdoor wood boilers (OWB), also known as outdoor wood

fired hydronic heaters (OWHH) were not included in the EPA residential wood stove regulations and have not been regulated by EPA or the Department. OWB, which burn wood to heat water that is piped underground to a nearby structure (usually a home) for space heating, are available in a wide variety of sizes and efficiencies. OWB, on an average per hour basis, emit about four times as much fine particulate matter as conventional wood stoves, about 12 times as much fine particulate matter as an EPA

- certified wood stove, and 1000 times more than an oil furnace. In addition to fine particulates, wood combustion emissions contain sulfur oxides, nitrogen oxides, carbon monoxide and potentially cancer

- causing com pounds including formaldehyde, polycyclic aromatic hydrocarbons, benzene and dioxins. Fine particulates can aggravate lung diseases such as asthma, emphysema and bronchitis. Children, the elderly and those with respiratory problems are most at risk from exposure to wood smoke. In June 2007, the Maine Legislature enacted LD 1824, An Act To Regulate Outdoor Wood Boilers. This legislation established emission standards for new outdoor wood boilers starting in 2008 and also directed the Department to adopt rules related to outdoor wood boilers. “The rules must include provisions relating to siting, operation and labeling requirements, stack heights, dealer and manufacturer reporting, public notification of emission standards and operation and siting requirements, code enforcement officer training, nuisance conditions and existing inventory issues.” Chapter 150 establishes requirements for the sale and installation of new outdoor wood boilers, including particulate emission standards and requirements for setback and stack height, certification, sell

-through of existing inventory, and labeling. The rule also contains general provisions which apply to all OWB. These provisions include prohibited and allowed fuels, visible emissions standards, notice to buyers, and owner manual requirements. In addition, pursuant to the new legislation, for the purpose of this rule, the Department included a definition of “nuisance” and a method by which a nuisance condition can be identified. Pursuant to 38 MRSA Section 610

- B, Chapter 150 was adopted as emergency major substantive rules pursuant to Title 5, section 8073 and must be submitted to the Legislature for review by January 15, 2008.

**BASIS STATEMENT FOR AMENDMENT OF MAY 15, 2008**  In April 2008, the Maine Legislature enacted Resolve Chapter 190, Regarding Legislative Review of Portions of Chapter 150: Control of Emissions from Outdoor Wood Boilers, a Major Substantive Rule of the Department of Environmental Protection, Bureau of Air Quality Control

. This legislation requires amendments to Chapter 150 in several areas: 1) clarif ying that in order to be eligible for the sell

-through exemption contained in the rule the outdoor wood boiler must have been purchased, paid for in full and in the State of Maine prior to Apri l 1, 2008 ; 2) authorizing the optional use of setbacks from neighboring dwellings for the installation of new outdoor wood boilers ; and 3) requiring that setbacks from stat e licensed school , daycare or healthcare facilities conform to the general setback requirements

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Chapter 150: Control of Emis sions from Outdoor Wood Boilers 12 **BASIS STATEMENT FOR AMENDMENT OF MARCH 19, 2009** In April 2008, the Maine Legislature enacted Resolve 2007, Chapter 190, Regarding Legislative Review of Portions of Chapter 150: Control of Emissions from Outdoor Wood Boilers, a Major Subst antive Rule of the Department of Environmental Protection, Bureau of Air Quality Control

. This legislation requires the Board of Environmental Protection to adopt rules by April 1, 2009 to control the sale, installation, use and siting at residences and businesses of outdoor wood boilers that combust biomass pellets as a fuel source.

**BASIS STATEMENT FOR AMENDMENT OF MARCH 18, 2010**  In May 2009, the Maine Legislature enacted Public Law, Chapter 209 LD 1171, An Act to Amend the Laws Governing Outdoor Woo d Boilers , which became effective September 12, 2009. This legislation directs the Department to amend the definition of commercial outdoor wood boiler, establish a voluntary technology

- forcing particulate emission limit, amend the definition of outdoor w ood boiler and change the qualifications for those who prepare an evaluation, report and installation recommendations for commercial outdoor wood boilers and larger outdoor wood boilers. In addition to the basis statement above, the Department has filed with the Secretary of State a re sponse to comments received during the comment period.