Hello,
I am considering making an evaporator using a 275 gal oil tank as the arch. I am trying to do this as inexcpensivly as I can, and buying firebricks is simply out of the question. What other alternitaves are there? Could I put thermal blanket on the outside of the arch? Another Idea I had was using red brick such as these (http://nh.craigslist.org/mat/3223458771.html) to line the inside. I'm open to any ideas. Do I even need firebrick if its an old oil tank?

Thanks
Brian