I won the bid on eBay for a small wood stove for the greenhouse. It's pretty cool. you can lift the top on it to cook a pot of water. It has tiles around it. This will help keep the oven hot after the fire dies down. It is not very big, and the price was good. We did think about building a rocket stove, but the oil barrels rust out every one or 2 years. I didn't want to be fixing it every year. So a tile stove was my 2nd choice.