A modular oven used as a pizza oven, a wood-burning stove, a barbecue PIT and an open fire. Equipment combining the functions of a wood-burning stove, a barbecue, a pizza oven and a space for an open fire in a single modular component, and allowing easy movement based on castors, is not known. The object of the present invention is to provide a modular oven formed by a vertical structure composed of modules that may be removed and installed, allowing the desired equipment to be constructed. A further object is to be able to provide the structure in the form of modular components made from refractory material, for example refractory concrete, which facilitates the construction thereof. A further object is to provide the base thereof as a heat source, with an opening designed to receive firewood and able to receive other modules or to act as an open fire.

A high efficiency wood burning furnace assembly includes an internal firebox having a door positioned therein to access an interior of the internal firebox. An exhaust throat extends through an upper wall and a grate is mounted in the internal firebox and is spaced vertically above a lower wall. A primary diffuser is mounted within the internal firebox and is positioned adjacent the front wall and the grate. A primary air supply is in fluid communication with the primary diffuser to supply air to the primary diffuser such that the air is released along an upper surface of the grate. An air conduit is mounted in the internal firebox and extends upwardly from the primary diffuser. The air conduit releases air vertically above the grate and the primary diffuser. A front wall of the internal firebox has inlets extending therethrough that are fluidly coupled to the air conduit.

A high efficiency wood burning furnace assembly includes an internal firebox having a door positioned therein to access an interior of the internal firebox. An exhaust throat extends through an upper wall and a grate is mounted in the internal firebox and is spaced vertically above a lower wall. A primary diffuser is mounted within the internal firebox and is positioned adjacent the front wall and the grate. A primary air supply is in fluid communication with the primary diffuser to supply air to the primary diffuser such that the air is released along an upper surface of the grate. An air conduit is mounted in the internal firebox and extends upwardly from the primary diffuser. The air conduit releases air vertically above the grate and the primary diffuser. A front wall of the internal firebox has inlets extending therethrough that are fluidly coupled to the air conduit.

An appliance comprising a firebox, a first air duct and a room air chimney. During operation of the appliance heated room air adjacent to a viewing pane or the screen and heated room air from the first air duct is received within the chimney. The heated air within the chimney rises toward an open upper end causing the chimney to draw additional room air from adjacent to the viewing pane or screen.

A combustion device includes a body defining a firebox, a viewing window in front of the firebox, an upper plate adjacent to a top side of the firebox, a first air passage extending from an end adjacent to a rear end of the body to a second end adjacent to a front end of the body, and a second air passage adjacent to a back side of the firebox. The second air passage has a communication opening at an end communicated with the firebox. The communication opening is at a height higher than a height of a bottom side of the firebox and lower than a height of the top side of the firebox. A burner is disposed within and adjacent to the bottom side of the firebox.

A fireplace system can comprise a firebox and a heat exchanger. The heat exchanger may be in fluid communication with ambient air and may comprise an inlet configured to draw air into the front of the heat exchanger. Operation of a fireplace system comprising a heat exchanger may produce airflow through the heat exchanger by natural convection. The airflow through the heat exchanger may reduce heat transmission from the firebox and the fireplace system.

A control system for a fuel-burning appliance such as a wood or pellet burning stove may include a particulate matter sensor. The control system may also include an ignition system to ignite an ignition charge of ignitable fuel. A processor controls the operation of the functional components of the appliance to maintain operating conditions within pre-determined parameters.

A chemical plant may include one or more fired heaters for heating of process streams. A fired heater may include a direct-fired heat exchanger that uses the hot gases of combustion to raise the temperature of a process fluid feed flowing through tubes positioned within the heater. Fired heaters may deliver feed at a predetermined temperature to the next stage of the reaction process or perform reactions such as thermal cracking. Systems and methods are disclosed to optimize the performance of fired heaters or reduce energy consumption of fired heaters.

A boiler that includes a housing is disclosed. The housing houses a combustion chamber, a heat exchanger system, a heat flow path, an isolating member, and a removable panel. The heat flow path thermally couples the combustion chamber and the heat exchanger system. The isolating member at least partially separates the combustion chamber from the heat exchanger system wherein. When the removable panel is removed a user is provided access to the heat exchanger system. The isolating member is internal to the housing. The removable panel is an internal removable panel positioned on the isolating member. When the internal removable panel is removed, the user is provided internal access to the heat exchanger system. In other embodiments, the panel is an external removable panel positioned on an exterior wall of the housing. When the exterior removable panel is removed, the user is provided exterior access to the heat exchanger system.

An outdoor fire pit comprised of a concave fire chamber, a heat chamber that is positioned below the fire chamber and is comprised of partially enclosed area surrounding the bottom portion of the fire chamber. The fire pit includes a conduit or multiple conduits with the proximal end connected to the heat chamber and the other end extending distally from the fire pit. A fan connected to the conduit such that the fan is operable to blow or pull air through the conduit to the area surrounding the fire pit.