If the wood burner that started it all was connected into your home heating, the furnace would be part of your heating system for your house and therefore it should be covered under your homeowners policy. Hopefully you have a replacement cost policy. The wood if it is for your own use and not for sale should be covered under your contents coverage on the home as well. The building, well, that will depend a lot on your policy. Could be considered an outbuilding under your home owners policy or if you have a farm owners policy might need to have been specifically insured. Again it all depends on whats included on your insurance policy. Hope you get a good insurance adjuster and hopefully you have an insurance agent that knows his stuff and keeps his nose in the claim to see that you are getting treated fairly per the contract of insurance. Sorry to harp on the insurance angle but Insurance Claims are what I do for a living so my hope is that your policy and Ins. Company can get you back to whole again. So sorry to hear of your loss, but as others have said, thankful that there was not any loss of life.