Question: I was given a cast iron wood boiler that I want to use in my barn. I probably won't hook up water to it 'til next year. I'm wondering if I leave the water input and output open, if it will hurt to burn wood in it with no water circulating through it? Thanx...Bob H. Answer: Don't do it! You'll ruin the boiler. Get a 55 gallon drum kit of a hardware store tin stove if you need temp heat. You'll ruin the seals between the section and maybe even crack the castings.