The comments are usually very inquisitive and spirited when it comes to home inventions and efficient energy devices.  Here are a few of them:

commenter Shane says:

i think it is a good idea for practical off grid & such & wood is no problem where i am , but you could use other materials such as, leaves , manure of sorts , paper saw dust or shaving’s from a local mill or building sites maybe . P S mine is working good too ty engineer775 but my coil is set behind my pot belly stove & made like a radiator

commenter David has this to say:

Well we kind of need the trees for other stuff too 🙂 I’m no expert but I can’t imagine that the burning process of wood isn’t as efficient as other (fossile) fuels. I don’t think you get the same amount of energy from burning a log than burning the same amount of fuel. And for most people wood is scarse, takes room to store and time to dry.

You can decide if this is a worthy endeavor or not by watching the video.  We always like to examine creative ways to improve energy use!