What is there to say about fire wood, ... your heating fuel?
We can talk for hours about this topic, but we want to keep it very simple.
It almost does not matter what species of wood you are burning, just make sure it is well seasoned.
Well seasoned means that your fire wood was cut and split a least 1.5 to 2 years ago, properly stacked and covered from the rain and snow.
Notice the KEY words: Cut, Split, Years, Stacked and Covered
This will bring the moisture content (MC) down below 20%. Between 15% and 18% is optimal to get the most heat out of your fire wood.
What You Should Never Burn in Your Wood Boiler:
Never burn household garbage or cardboard. Plastics, foam and the colored ink on magazines, boxes, and wrappers produce harmful chemicals when burned. They may also damage your wood-burning appliance.
Never burn coated, painted, or pressure-treated wood because it releases toxic chemicals when burned.
Never burn ocean driftwood, plywood, particle board, or any wood with glue on or in it. They all release toxic chemicals when burned.
Never burn wet, rotted, diseased, or moldy wood.