Wood gasification boilers are the most efficient means of extracting energy from wood for residential heating, but they are considered less efficient than natural gas, propane and oil boilers. Homeowners who have access to cheap or free wood, however, can reduce their heating bills by switching to wood gasification.
Wood gasification boilers produce far less smoke than standard outdoor wood furnaces, and they can be installed indoors. In many areas, outdoor wood furnaces are heavily regulated or even banned because of the particulate matter they produce, but wood gasification burning units are often allowed in these areas. If trees are replanted to replace those used in wood boilers, they can absorb a roughly equal amount of carbon dioxide that is expended by the boiler as they grow, so many consider wood boilers to be carbon neutral.