So I am on my 9th season with my owb. It works perfect. It's simple. The house is always 72 and the hot water never ends. However, I use a lot of wood....... North of 12 cord. So I find this 3 year old eko40. I have a perfect sized garage/woodshed right next to my current owb. I'm thinking 1000 gallons storage and eko in the outbuilding, tie into my current underground lines and process half the wood. What am I not thinking of here? I must be missing something. What do I look for that could be bad on a used eko? It has a new controller(supposably the screen was craked on the old one) and new door seals. The pictures he sent me were before they were replaced and the front looks really really dirty. Talk me out of this because right now all I have to do is cut a lot of wood and I really don't want to buy someone else's headache. However, the temptation of less wood is really strong.