Interesting furnace set up. Burning brush in the furnace how often are you having to fill it back up?
Burning mixed brush and wood like that are you seeing any creosote build up in the exhaust or is the system designed to work with any combustible wood?
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It really depends how cold it is outside. If its mild brush will last maybe half a day at most. But when its cold I will burn through brush in a matter of hours.
Usually when it gets really cold I burn larger logs and less brush. But when its warmer I go through much of the brush I have.
Yes there is build up, but I go behind the furnace about once a month and clean it all out using a stick.
They recommend non-green wood, though honestly I do burn it sometimes. Any kind of wood is fine as long as its not pressure treated, or processed like plywood or particle board. Only natural wood from trees.