The CottageRocket is our take on the Rocket Mass Heater for tiny houses, treehouses, school buses, mobile homes, houses with wooden floors or crawl spaces or basements--any place where a larger thermal mass bench would be a problem, but some thermal mass for overnight heat would be desirable. we get a lot of questions about what they look like on the inside. You can find a lot more of our work on CottageRockets and other Mud and Fire projects by becoming an Uncle Mud supporter for as little as $1 per month at https://unclemud.com/patreon