A high turndown furnace for an air handling system. In one example, the furnace includes a plurality of tubes divisible by four with a first modulating valve supplying gas to ¼ of the tubes and a second modulating valve supplying gas to ¾ of the tubes. In one aspect, the furnace is capable of providing a 16:1 turndown. In one aspect, the furnace is capable of providing seamless turndown operation throughout the entire firing range.

An HVAC system is provided. Embodiments of the present disclosure generally relate to an HVAC system in which multiple indoor units are coupled to central outdoor unit, where at least one of the indoor units is configured to provide conditioned air through ductwork and at least one indoor unit is configured to provide conditioned air without ductwork. Moreover, a gas furnace can be provided in the system, for harsher environments that benefit from more robust heating. Additional systems, devices, and methods are also disclosed.

An HVAC system is provided. Embodiments of the present disclosure generally relate to an HVAC system in which multiple indoor units are coupled to central outdoor unit, where at least one of the indoor units is configured to provide conditioned air through ductwork and at least one indoor unit is configured to provide conditioned air without ductwork. Moreover, a gas furnace can be provided in the system, for harsher environments that benefit from more robust heating. Additional systems, devices, and methods are also disclosed.

A portable heater that includes a ceramic substrate with a heating element configured to define a field of direct radiation, a heat reflector with a concave reflective surface configured to define a field of reflective radiation, a grill cover mounted on the heat reflector, where the ceramic substrate is mounted on an interior side of the grill cover with the heating element facing the concave reflective surface such that the field of direct radiation onto the concave reflective surface is unobstructed.

A forced air heater that includes a temperature sensing device, the temperature sensing device includes: a sensing plate mounted on a metallic component in the environment to be heated; and an electrical contact connected to the sensing plate, wherein the electrical contact is thermally coupled with the metallic component via the sensing plate. There is further provided a method of controlling a heater that includes a temperature sensing device that it is thermally connected to a solid component in the environment to be heated.

An electric radiator is described, having a housing, delimiting an upper compartment and a lower compartment, at least one heating member installed in the upper compartment and capable of emitting thermal radiation when it is supplied with electrical power, at least one electrical energy storage device, an attachment device enabling the removable installation of the electrical energy storage device in the lower compartment, in such a way that the electrical energy storage device is capable of varying between a connection configuration and a disconnection configuration, and a heat protection shield located between the heating member and the electrical energy storage device and blocking infrared rays while allowing the movement of air by convection, which are emitted in the direction of the electrical energy storage device.

The present disclosure provides a novel ready to assemble simulated fireplace insert kit which can be combined with a pre-built furniture piece, or a ready to assemble furniture piece to provide a unique solution in the ready to assemble furniture product category. The ready to assemble simulated fireplace insert is broken down into individual components that can more easily be packed and shipped in a flat format and assembled by the end user. In some embodiments, certain components may be shared across different width insert assemblies to reduce costs.

A tube bundle-type heat exchanger, to a tube base, and to a method for sealing same. Aspects of the invention relate to a tube base for a tube bundle-type heat exchanger. In particular, the tube base includes a stack of multiple tube base plates with at least one through-opening for receiving a respective tube of the tube bundle-type heat exchanger. The throughopening is sealed by at least one seal ring. Additional aspects relate to a tube bundle-type heat exchanger comprising such a tube base and to a method for sealing a tube bundle-type heat exchanger in particular in the region of the tube base.

Systems and methods are involved for an enhanced heating system includes (I) an enclosure, (II) a burner, (III) an electrically-powered fan, (IV) a wall partition, and (V) a thermoelectric generator to generate electrical power for the electrically-powered fan. In addition, other aspects are described in the claims, drawings, and text forming a part of the present disclosure.

An electric heating device includes a housing forming a receptacle and a fluid channel The receptable holds a PTC element. In order to reduce weight and assembly effort, the housing is formed by a uniform extruded profile.