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Woodburner emissions Updated: 25 Feb 2010

Test results

Guide to the table

1 Wood type

Seasoned radiata was clear, with "normal" resin content. It was not "old man pine" but more representative of plantation firewood.
Macrocarpa and blue gum were normal firewood, with no distinguishing abnormalities.
Manuka was in log form, up to 85mm in diameter, and had been seasoned for a long period in the open air.
Unseasoned radiata was from a plantation tree, felled two weeks before the test and cut and split one week after that. Because the wood was wet, the woodburner was left on high-burn setting for approximately 25 minutes (compared with the normal test of approximately 10 minutes), or until the wood was burning brightly before the air control was turned down to a medium setting. Turndown any earlier resulted in the fire smouldering and going out.

The testing of large logs of dry radiata and blue gum was performed with the fuel as supplied by the firewood merchant. The logs were not split further.

2 Burn time
The time taken for the fuel to be consumed, from when it was first placed on the hot embers.

3 Average output
The average of a series of heat-output readings taken over the burn time.

4 Emissions
The exhaust solid content measured as grams per kilogram of fuel burnt. The national environmental standard requires emissions of no more than 1.5g/kg using the test fuel (kiln-dried radiata).

5 Efficiency
The heat that ends up in your lounge relative to the energy content of the fuel burnt.