You might want to stop by Spider Web Gardens in Tuftonboro. They have a unit that they use to heat their greenhouses. They are happy to show you the system if you ask. It's pretty neat.
On another note, I just heard a news report here in PA about a town that is considering banning them for many of the reasons discussed above. Depending on who is sitting downwind, it can be quite an annoyance to have the constant smoke.
Other than that, they are pretty cool.
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