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  Long-Term Performance of EPA-Certified Phase 2 Woodstoves, Klamath Falls and Portland, Oregon: 1998–1999 (PDF) (71 pp, 1.14 MB) (EPA/600/R-00/100) November 2000
Project Summary (PDF) (4 pp, 48 KB)

Wood stoves have been identified as a major source of particulate and polycyclic organic matter (POM) emissions. For this reason, new source performance standards (NSPS) were promulgated for wood stoves. Stoves sold after July 1, 1992, had to be certified for low emissions and meet the most stringent NSPS requirements, and are referred to as Phase 2 certified.

Laboratory and field studies have shown that certified wood stoves can physically degrade with use and that their air emissions increase commensurately. The objective of this study was to evaluate the condition and air emissions from old Phase 2 certified wood stoves installed in homes and used regularly for home heating since the 1992–1993 heating season or earlier.

Sixteen stoves were evaluated in the study, eight each in Klamath Falls and Portland, Oregon. An extensive database from 43-week-long test runs was developed. The particulate emission factors of the certified Phase 2 stoves appear to have increased with use, but on average, after about seven years, still have lower emissions than uncertified conventional stoves. In addition, it was clear from the results that emission rates for Phase 2 stove models reported as part of the NSPS certification process do not represent emission levels of the same stove models in homes after extended use.


John Kinsey

Robert McCrillis

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