I've been perusing through ULEB stoves in New Zealand. Some achieve exceptional results. They have several variations on the Wittus Twin-Fire concept that are ultra clean burning and efficient. These stoves are testing much cleaner and more efficient than high-efficiency pellet stoves.
https://www.tropicair.co.nz/product/duo-uleb-by-tropicair/
https://www.ferva.co.nz/
Here's the authorized stove list in NZ
https://www.ecan.govt.nz/data/authorised-burners/
https://www.tropicair.co.nz/product/duo-uleb-by-tropicair/
https://www.ferva.co.nz/
Here's the authorized stove list in NZ
https://www.ecan.govt.nz/data/authorised-burners/
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