The efficiency rating is on the back of all wood heaters, it will display: "MAXIMUM AVERAGE HEAT OUTPUT BURNING HARDWOOD" and "OVERALL AVERAGE EFFICIENCY BURNING HARDWOOD (%)". Do not buy a wood heater that does not display this information, as it does not comply with Australian standards.
Further information on wood heaters is available here:
Smoke from domestic heating | EPA
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Keywords: domestic heating, wood heater, efficiency