Provided herein are embodiments of, a multistage gas furnace, a controller therefor and a computer-usable medium having non-transitory computer readable instructions stored thereon for execution by a processor to perform a method for operating a gas furnace. In one embodiment, the gas furnace includes: (1) a burner, (2) a circulation fan and (3) a furnace controller. The furnace controller having: (3A) an interface configured to receive heating calls and a blower control signal, the blower control signal corresponding to an operating speed of the circulation fan and (3B) a processor configured to respond to the heating calls and the blower control signal by setting and adjusting a gas input rate for the burner that is based on the blower control signal and that corresponds to a discharge air temperature determined by a dedicated discharge air sensor associated with the furnace.

A fan with an integrated cooler is disclosed. Unlike conventional air-conditioners, the device is compact and lightweight, and can be used both indoors and outdoors without the need to enclose or otherwise control the user environment from thermal considerations.

An indirect gas-fired condensing furnace assembly and method includes a primary heat exchanger, a secondary heat exchanger, and a tertiary heat exchanger. The secondary heat exchanger assembly may be an intermediate single-pass tubular heat exchange section made from a corrosion-resistant material. The tertiary heat exchanger assembly may be a single-pass tubular heat exchanger section with a corrosion resistant material. The tertiary heat exchanger assembly may include a plurality of fins. The primary heat exchanger assembly may include a plurality of aligned tubes wherein each tube includes a first straight portion, an intermediate portion, and a second straight portion such that the primary heat exchanger tubes surround the secondary and the tertiary heat exchanger assemblies such that the airflow is configured to traverse the primary heat exchanger assembly, the secondary heat exchanger assembly, and the tertiary heat exchanger assembly in various directions such that a risk of condensation freezing within the secondary and tertiary heat exchange assemblies is reduced.

A process for melting a snow mound located on a ground surface comprises the steps of actuating a heat emitting apparatus and inserting an elongate portion of the heat emitting apparatus into the snow mound so as to emit heat into a central portion of the snow mound, wherein the elongate portion is proximate the ground surface. As the snow melts within the interior or central portion of the snow mound, a cavity forms within the snow mound which creates an insulating container for retaining the emitted heat within the container during the melting process, thereby increasing the efficiency of the heat transfer from the heat emitting apparatus to the snow. A portable heat emitting apparatus is also provided.

A portable indirect fuel fired heater includes a burner assembly having a fuel burner to deliver fuel from a fuel supply to a combustion chamber of the heater and a combustion air blower to deliver combustion air to the combustion chamber with the fuel for combustion in the combustion chamber to produce exhaust gases. A heat exchanger receives air to be heated in heat exchanging relationship with at least a portion of the combustion chamber. A sensor senses an oxygen level as a partial pressure of oxygen in the exhaust gases. A controller operates an actuator operatively connected to the burner assembly to controllably vary the delivery rate of combustion air and thus vary the ratio of the air and fuel responsive to the oxygen level sensed by the combustion sensor so as to maintain the sensed oxygen level at a prescribed set point level stored on the controller.

A heating system may include at least two different types of heating elements. The heating elements may include at least one infrared heating element and at least one halogen lamp. The heating elements may be positioned within a heating section of a duct through which air flows to be heated by the heating elements, which air flow may be driven by a fan. The heating system may be incorporated into a variety of heating devices, such as electric fireplaces and space heaters.

A furnace including a housing and a firebox in the housing having a combustion chamber. The furnace includes a combustion air delivery system for delivering combustion air to the combustion chamber. The combustion air delivery system includes a manifold mounted outside the combustion chamber and extending vertically along the front face of the combustion chamber from a lower end to an upper end. An air blower is mounted on the manifold. The combustion air delivery system includes a primary combustion air passage for delivering air from the air blower to a primary combustion air outlet at the front face of the combustion chamber. The combustion air delivery system includes a secondary combustion air passage for delivering air to a secondary combustion air outlet positioned inside the combustion chamber adjacent the top face of the combustion chamber.

A furnace including a combustion chamber for burning fuel can have increased fuel burning efficiency, increased heating efficiency, and decreased harmful emissions of combustion byproducts. A combustion air delivery system delivers primary and secondary combustion air to the combustion chamber. Primary and secondary combustion air may be delivered at amounts that increase burning efficiency. An amount of secondary combustion air can be controlled by a valve system. A heat transfer device efficiently transfers heat from products of combustion for heating an enclosed space.

An oven includes a gas burner provided at a rear bottom portion of the oven and below an opening in a bottom panel of the oven. A heat exchanger is provided above the bottom panel opening such that heated air from the gas burner flows upwardly through the heat exchanger. The heat exchanger is positioned in front of a fan provided at a rear wall of the oven. The fan forces air through a plurality of openings in the heat exchanger to supply heated air to an oven cavity of the oven. The gas burner flames are substantially isolated from turbulent airflow from the fan.

A wood burning heater is presented. The wood burning heater has an external box housing that has an inside, an outside, a front, a back, a first side, a second side and a bottom. On the inside of the wood burning stove is an inner fire box. The inner fire box has an opening that coincides with the front of the external box housing and a blower device that extends from the external housing box.