Per unit mass, not volume, the nod goes to the conifers because of the resins in the resin ducts in the wood. For years now, the Scandinavian countries have been buying "unit trains", a mile in length, of SPF wood pellets (spruce pine fir) and shipping it home all the way from BC for power generation.
I could have bought fire pellets made from straw, corn cobs and hardwoods. They don't have the energy value of the locally produced SPF wood pellets. I burned 100,000 lbs over the years. I have a good idea what it takes to heat a good Canadian house in winter. Friends tell me that the Douglas-fir pellets are ever so slightly better again but for the cost difference, the SPF worked out just fine.
Conifer woods have been used here for more than the last 15,000 years for cooking fires. Seems to work OK.
I could have bought fire pellets made from straw, corn cobs and hardwoods. They don't have the energy value of the locally produced SPF wood pellets. I burned 100,000 lbs over the years. I have a good idea what it takes to heat a good Canadian house in winter. Friends tell me that the Douglas-fir pellets are ever so slightly better again but for the cost difference, the SPF worked out just fine.
Conifer woods have been used here for more than the last 15,000 years for cooking fires. Seems to work OK.