Abstract: Particulate emissions from a wood fire in a fireplace having a baffle for preventing the direct flow of fluid into the flue from the wood fire are reduced by locating a hydrocarbon gas pilot source in proximity to the baffle. Ignited gas from the pilot combines particulate emissions from the wood fire while they are in the fireplace and before they reach the flue. Air from outside of the fireplace is supplied into proximity with ignited pilot gas so the outside air and the ignited pilot gas mix. A flame sensor for the pilot controls the flow of gas to the pilot source and ignition of the pilot source.

Abstract: A single chamber wood stove has primary and secondary combustion zones in direct fluid flow communication with each other. Air from outside the stove is supplied to the primary and secondary combustion zones. Gaseous hydrocarbon fuel from a source located outside the stove is selectively supplied to the secondary combustion zone and is ignited by a glow plug in the secondary combustion zone in response to a signal derived by a temperature detector in the secondary zone. The gaseous hydrocarbon fuel flows to the secondary combustion zone at a rate in the range of about 0.25 to 3 cubic feet per hour. The fuel is supplied to the secondary zone when the secondary zone temperature is above carbon monoxide ignition temperature.

Abstract: A resistance heater heats air forced by a fan into a woodstove secondary combustion chamber having an ignitor. The fan, heater and ignitor are controlled by a temperature sensor for gas flowing from a primary combustion chamber to a secondary combustion chamber. Two ignitors, extending through the stove back wall into the secondary combustion chamber, are controlled by the temperature sensor.