A lot more stove makers are submitting third party confirmed efficiency figures on the EPA’s list of accredited wooden and pellet stoves, providing these shoppers who really treatment about confirmed effectiveness quantities a lot more possibilities. Even so, there are nevertheless only five firms who submit the confirmed performance of at least one of their stoves:          Blaze King, Kuma, Jotul, Travis and Woodstock Soapstone.
The Alliance cautions customers from relying on stove efficiency promises posted on producers web sites. Most makers submit efficiencies quantities employing a variety of non-standardized calculations. Almost all post efficiencies employing the European reduced heating worth (LHV) standard, which was used by Congress and the IRS for the federal wood and pellet stove tax credit score, as opposed to the increased heating worth (HHV) normal utilized by the EPA. See this Wikipedia page for far more about the variation among LHV and HHV.
The EPA has never ever required stoves to be examined for effectiveness but strategies to do so in the following 18 – 24 months.  Once that occurs, shoppers will be capable to make far more informed alternatives.
Examined efficiencies of wooden stoves are much less crucial than pellet stoves, simply because effectiveness is greatly dependent on the dampness articles of your wooden and how nicely you operate your stove. With pellet stoves, the lab examined effectiveness numbers are much more representative of efficiencies you are likely to get at property (though pellet stoves that do not have ash cleaned and regular maintenance and yearly comprehensive cleanings will get rid of efficiency.)
Wood Stoves with Verified Efficiencies
There are now three manufacturers putting up verified efficiency numbers on the EPA record for non-catalytic stoves and a few for catalytic stoves. Amongst the non-cat stoves, Blaze King’s Scirrocco and Ashford are 75% successful, Kuma’s Tamarack is seventy three%, Blaze King’s Briarwood is 71% and the Jotul F602 is 70%. These are all HHV figures and significantly over the 63% HHV default performance price for non-cat stoves on the EPA record. (These verified efficiencies, ranging from 70 -seventy five% HHV, would be roughly seventy seven-83% LHV and as a result all easily qualify for the federal tax credit.)
There are also three producers publishing effectiveness quantities for their catalytic stoves. Blaze King has five designs among 77 and eighty two% effectiveness. Woodstock as a single model at eighty one% and Travis has two, each at eighty%.  Of all the wooden stove companies that checklist 3rd-social gathering, verified efficiencies on the EPA list, Blaze King is the only organization that lists verified efficiencies for all their stoves.  The others only record it for one particular or two versions.
Pellet Stove with Verified Efficiencies
As of March 2013, there is only one particular pellet stove firm with a verified effectiveness on the EPA checklist – Seraph Industries.  Unfortunately, the EPA mistakenly listed their LHV amount and recurring ask for by the Alliance for Environmentally friendly Heat has not resulted in a correction.  The Illinois dependent firm, Seraph Industries, experienced their stoves qualified after screening by Intertek labs, which confirmed 77% HHV performance.  It is essential to be aware that even although the Seraph Genesis stoves at seventy seven% are considerably less than the seventy eight% EPA default effectiveness for pellet stoves, they are probably amongst the most efficient US manufactured pellet stoves.  The regular effectiveness of US made pellet stoves is almost certainly about 70% HHV, based mostly on many 3rd party research.
Seraph’s site does not help to decrease the confusion.  Like almost all stove producers, they only list their LHV effectiveness and do not tell buyers that they figures are LHV, not HHV, or that their inclusion on the EPA list erroneously uses the LHV quantity.
Pellet stoves have considerably wider variability in effectiveness than cat or non-cat wooden stoves, and some shoppers are inadvertently getting versions that are below sixty% or even 50% successful regardless of higher promises by manufactures.
Suggestions for Shoppers
For now, the safest point for shoppers who want higher efficiency pellet stoves is to get stoves that are EPA accredited or are manufactured in Europe. A broad assortment of benefit and large-stop pellet stoves are EPA qualified from companies these kinds of as Harman, US Stove, Englander,  Lennox and Seraph.  EPA accredited stoves have a tendency to be much more efficient because uncertified ones can have extra air in the combustion chamber that can dramatically reduce efficiency.
The typical effectiveness of a catalytic stove on the EPA record is 80% HHV, in contrast to seventy two% HHV for a non-catalytic stove. The regular pellet stove is believed to be only all around 68% HHV productive. The regular particulate emissions for a stove on the EPA listing is one.6 grams per hour for a cat and three.three grams for every hour for a non-cat. Decrease grams of particulates per hour can imply increased performance, but there is not always a immediate correlation.
The Alliance for Environmentally friendly Warmth commends these companies for submitting confirmed HHV effectiveness figures to the EPA so consumers have access to dependable performance info. The Alliance urges shoppers to take into account acquiring stoves from companies who are clear and offer confirmed effectiveness info to the community.
For much more history on this concern, see: