EPA Certifications- efficiency report

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Heat exchanger differences or convection fan differences can do that and would be plausible reasons. It doesn't take much sometimes.
That`s the big one. We can assume most of the pellet stove makers have the burn efficiencies down pretty good but there is an equally important need to develop improved heat transfer .
 
New Zealand has a listing of authorized solid fuel burners with efficiencies shown for Ecoteck, Enviro. Emission info also listed http://ecan.govt.nz/services/online-services/pages/authorised-solid-fuel-burners.aspx

Thanks Lake Girl for that link to actual efficiency numbers in New Zealand! These are LHV numbers, not HHV, and show most wood stoves around 70% with none over 77% LHV. Pellet stove numbers look a lot better with some Ecotecks at 88%. Some of the American-made wood and pellet stoves don't do too well. Will have to look into how they do the efficiency testing.
 
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