For steady, low maintenance, high-output heat, nothing compares to a coal stove.
Mazzeos Chimney & Stoves, a Maine coal stove dealer, offers models to heat a small den or a whole house from industry leaders including Vermont Castings, Morso and Harman.
Pictured is the Vigilant II coal stove by Vermont Castings
Coal is clean burning, producing no visible smoke or creosote. Coal stoves can burn longer per fuel load than wood stoves and provides an even and controllable heat. Some stoves are "dual-fuel" and capable of burning both wood and coal