Ultra-low emission burners give you a wonderful double-glow look. They are started slightly differently to traditional (single chamber) wood burners that New Zealanders are familiar with.
They are all freestanding, downdraft, twin chamber burners. No wood goes into the lower chamber. The lower chamber is designed to bolster combustion by re-combusting gases (typically smoke), expelled during primary combustion.
When ultra-low emission burners are put into 'downdraft mode' this allows the gases from the top chamber to enter the lower chamber. This is a key design feature to reduced emissions.
All of the ultra-low emission burners are slightly different. For example:
- some require an electric fan
- some are fully automated
- some require the door of the fire to be left slightly ajar for 15-20 minutes (it goes into downdraft mode once the door is closed)
- Some require the operator to push in a lever 15 minutes after lighting to put it into downdraft mode
- They vary in weight
- Their warranties vary