Hello. First post here. I was thinking about a OWB until I found this site and started reading. After deciding a gasser was in my future I started looking for a used one. I ended up buying a Econoburn 100 that's about 3 years old. It came with a 659 gallon storage tank from a company called STSS. The tank uses copper heat exchangers and it was purchased new with the Econoburn. It seems to all be in very good condition and I trust the person I got it from. I paid $3,800. He said he had north of $11,000 into the package. Does this sound correct? Thanks.