Brier,
I'm read your post about heating your greenhouse and tank water using a wood furnace. That interests me a great deal as I am building a greenhouse for an AP system in WA state and have an ample supply of firewood. I looked at the website you recomended for heating coils in the fire box. It seems like a great idea. Does the water flow from the FT to the heating coils and back to the FT? Do you have any pictures of your system and/or wood furnace? Also how large an AP system are you heating?

Does anyone else have experience heating with wood?

Thanks,

Scupper