On
May 9, the EPA sent letters to manufacturers of outdoor boilers (also called outdoor hydronic heaters) requesting that
they remove efficiency information for EPA qualified models tested with EPA’s previous Method 28 OWHH from websites and all printed materials. The EPA sent them new
hangtags without efficiencies to replace the old ones.
The
letters, signed by Gregory Green, Director of the Outreach and Education
Division, asked that this be done by June 14, giving companies about 7 weeks to
comply. The companies are also asked to inform their retailers to discontinue
use of the old hangtags and printed materials using the old efficiency numbers.
The
EPA’s move to stop the use of those discredited efficiency numbers was welcomed
by the Alliance for Green heat and many state agencies and industry
members.
The
request is the latest twist in a voluntary program that called into question both the EPA’s
credibility to test efficiency and the boiler companies who continued to use
the impossibly high numbers. It also gave a significant marketing edge to
outdoor boilers who could claim far higher efficiencies than wood and pellet
stoves and automated European boilers.
Outdoor boilers tested under the previous EPA approved test method were reporting
efficiencies of up to 97%.
The
EPA removed the efficiency numbers from their website in 2011 and requested
manufacturers to stop using them.
Manufacturers reportedly balked, saying they wouldn’t stop using the
high efficiency numbers until their competitors stopped.
Today,
it is unclear how efficient Phase 2 outdoor boilers actually are. According to
a paper from Intertek, one of the leading wood stove test labs: “With the exception of a number of test
reports indicating impossibly high efficiencies, the weighted average
efficiencies of appliances meeting EPA Phase II emissions limits average 55%.” The State of Maine gives an estimate of 65%
efficient to Phase 2 outdoor boilers on its fuel calculator and 55% for
unqualified boilers.
Related stories: http://biomassmagazine.com/articles/5468/epa-biomass-boiler-industry-proposed-emissions-rules-arenundefinedt-flying-at-the-state-level
Related stories: http://biomassmagazine.com/articles/5468/epa-biomass-boiler-industry-proposed-emissions-rules-arenundefinedt-flying-at-the-state-level
The true efficiency of boilers is always in question, and those numbers, though perhaps inaccurate, slightly misleading and overly-exaggerated gave the average consumer some sort of grading and comparison scale. I wonder...how is the average consumer going to compare efficiency now?
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