The top five wood boilers are manufactured by Greenwood, Alternate Heating Systems, Central Boiler, Econoburn and Wood Doctor, as of 2015. Some other high-quality wood boiler brands include Aqua-Therm and Eco Angus.
Wood boilers from Greenwood are easy to maintain and manufactured using high-quality raw materials. These boilers promote clean burning by leaving very few traces of ash. They also reach high thermal efficiencies and meet CSA guidelines, according to Greenwood. The two major Greenwood boiler categories are the Frontier Series indoor wood boiler and the Denali Series indoor wood pellet boiler. Alternate Heating Systems produce highly efficient gasification wood boilers. The gasification method prevents residue deposits and smoke traces from occurring inside a chimney. Their line of wood boilers also has an automatic on-off cycle, as well as a 20-year warranty for the wood gun.
Central Boiler provides a completely renewable heating option. These wood boilers are EPA Phase 2 certified, and Central Boiler claims to be the number one seller of outdoor wood furnaces. The E-Classic 3200 and E-Classic 1450 are this brand's top models, and they are available in four color combinations. They are also equipped with E-Link technology that keeps track of the temperature and performance of the boiler. Econoburn wood boilers are durable because they use superior carbon steel and bear the Warnock Hersey certification mark. This brand is cost-efficient, and their wood boilers are considered the best-built in North America.