Loading of Firebox
Its important to only load firebox with fuel to acheive deisired burn time based on outdoor temperatures. Do not overload firebox. Never allow fire smolder. A smoldering fire will create smoke and reduce efficiency as well as creosote build-up.
You should size your stove to provide sufficient heat without constant reloading. It's important to not oversize or undersize your outdoor wood furnace. Choosing the appropriate size outdoor furnace will ensure that you’re operating at peak efficiency.