Even people who don’t heat with wood or use an outdoor wood boiler find it interesting to see how heat is delivered underground, from one place to another. That’s what this video is all about. It shows the Danish system of insulated, underground pipes I installed to connect my outdoor wood boiler with my house and workshop. It’s called Logstor (named after the place where it’s made). Click to watch how this pipe is designed and how efficiently the heat transfer process happens.