Program Template photo identifier

Air Quality Program

Wood Stoves, Fireplaces, and Pellet Stove Manufacturer Information

A photograph of wood stove testing equipment.

This web page is intended for manufacturers of solid fuel burning devices. It has information about how to get approval to sell solid fuel burning devices in Washington State.


To sell wood stoves, coal stoves, and corn stoves:

  • Test the stove at an EPA certified lab using an EPA approved test method. Either Category A (EPA approved methods) or Category B (EPA approved alternative methods) is acceptable.

NOTE: NO new wood stoves are exempt from testing, regardless of air to fuel ratio.

Washington State's emission rate standards are:

  • 2.5 grams/hour for catalytic stoves
  • 4.5 grams/hour for non-catalytic stoves

To sell pellet stoves:

  • Test the stove at an EPA certified lab using an EPA approved test method.
  • Either Category A (EPA approved methods) or Category B (EPA approved alternative methods) is acceptable.

NOTE: NO new pellet stoves are exempt from testing, regardless of air to fuel ratio.

Washington State's pellet stove emission rate standard is 4.5 grams/hour.

  • Forward a copy of the test summary to Ecology's wood stove coordinator.
  • Clearly identify the make, model, and efficiency rating in the document you send to Ecology.
  • The wood stove coordinator will review your information and contact you if more information is needed.
  • Approved devices will be posted within 24-72 hours on an updated listing of legal devices at http://www.ecy.wa.gov/programs/air/indoor_woodsmoke/wood_smoke_page.htm

To sell manufactured fireplaces (also known as low-mass 
    fireplaces or zero clearance fireplaces):

NOTE: NO new manufactured fireplaces are exempt from testing. If a fireplace contains features to control the air to fuel ratio, it is considered a wood stove, and must be tested and approved as a wood stove.

Washington State's manufactured fireplace emission rate standard is 7.3 grams of fine particles per kilogram of test fuel.


Outdoor wood-fired boilers (residential):

Wood-fired boilers are not legal in Washington State.  EPA Method 28 OWHH is a Category C test not officially approved by EPA or Washington State.


To sell indoor wood and pellet furnaces:

  • Test the furnace at an EPA certified lab using an EPA approved test method. Either Category A (EPA approved methods) or Category B (EPA approved alternative methods) are acceptable.

NOTE: NO new wood or pellet furnaces are exempt from testing, regardless of air to fuel ratio

Washington State's wood or pellet furnace emission rate standards are:

  • 2.5 grams/hour for catalytic furnaces
  • 4.5 grams/hour for non-catalytic furnaces

To sell masonry heaters:

NOTE: NO new masonry heaters are exempt from testing; however, manufacturers may apply for an exemption from testing if a testing lab establishes a device is substantially similar in design to an already tested device. A Washington-approved process for this is available through OMNI-test labs.

Washington State's manufactured fireplace emission rate standard is 7.3 grams of fine particles per kilogram of test fuel.


To ask to be added to the list of Washington-approved solid fuel burning devices, or to get information about this process, contact Ecology's wood stove coordinator at: rod.tinnemore@ecy.wa.gov
360-407-6978
OR
Washington State Department of Ecology
P.O. Box 47600
Olympia, WA 98504-7600
Attention: AQ Wood Stove Coordinator