I've got one made by "heat source 1" it is awsome but you go thru a LOT of wood on the days under 20 degrees or so.Heating my house,garage,and hot water for free is GREAT!!!! If your going to get one make sure to get one with a power draft setup so it heats up quickly.The guy I bought mine from said they were coming out with a new model this year that uses 40% less wood.It would be worth the extra money.