Hi John;
I had not heard of this before.
Very interesting, although very vague about the design and installation.
No mention of how much heat is going out the chimney.
I suspect quite a bit.
Perhaps there could be a way to utilize this into a mass and store the heat.
Clean burning it may be but sending heat up the chimney is not efficient at all.
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I am not sure it does, its basic design is similar to other woodheaters which seem to radiate the heat from the wirebox.
It appears more efficient.
I am trying to find someone who has used it.
I have an old 30 year old heater that could be updated and its the same as his heater mentioned.