A tube heater for heating a fluid in an interior of the tube has a stainless steel cylindrical core. The core ranges about 3 to 300 mm in length and about 100 to 200 microns in thickness with an outer diameter of about 8 to 20 mm. An inner surface of the core has dimples and a conductive coating. A patterned resistive layer overlies the core in a thickness of about 9 to 15 microns. The resistive layer is thin- or thick-film printed about a circumference of the core. Two glass layers surround the resistive layer. Each glass layer is electrically insulative. The glass underlying the resistive layer has a thermal conductivity of more than 2 W/mK while the glass overlying the resistive layer has a thermal conductivity of less than or equal to 0.5 W/mK.

A method of controlling the temperature within a heating apparatus for eliminating or reducing combustion resonance, the method including measuring a temperature of the burner assembly; comparing the measured temperature with a predetermined temperature limit or range; determining whether the measured temperature is greater than a predetermined temperature limit or range; performing a controlled action if the measured temperature is greater than the predetermined temperature limit or range.

The present invention is a heater or heating device that uses microwave energy to generate heat quickly. The heater generates heat quickly by forcing air over microwave-heated oil or non-freeze liquid. As a non-limiting embodiment, the heater preferably includes most or all of the following components: an outer casing or housing, at least one air intake vent, a magnetron, a microwave emitter, a wave scatterer, at least one fluid holder, fluid, a capacitor, a transformer, a microwave containment casing, and a perforated microwave guard. As another non-limiting embodiment, the heater preferably includes most or all of following components: an outer casing or housing, a cooling fan, a magnetron, a microwave emitter, a wave scatterer, at least one non-freeze liquid holder, non-freeze liquid, a capacitor, a transformer, a microwave containment casing, a glass tube, a metal tube, a fan coil, a pump, a reservoir and expansion tank, and a fill plug.

A heating appliance has electrical circuitry, a controller, a heating element, a temperature sensor, and a power selection switch having a varying power setting for enabling the user to select a varying power heating mode during which the room temperature is sensed by and if below a certain desirable temperature level, the controller causes higher power heating until the room temperature reaches the certain desirable temperature level and then causes lower power heating.

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 heater includes short and tall cabinet units that are connected together, and an ignition unit. The short cabinet unit has a recess facing upwardly, and a first receiving space spatially communicated with the recess. The tall cabinet unit has a second receiving space spatially communicated with the first receiving space. The ignition unit includes an ignition seat disposed in the recess, an igniter mounted to the ignition seat, and a gas pipe group connected to the igniter and extending from the first receiving space into the second receiving space. A height of the short cabinet unit ranges from 45 centimeters to 60 centimeters; a height of the tall cabinet unit ranges from 65 centimeters to 70 centimeters.

An electronic cigarette includes a shell and a mouthpiece. The external wall of the shell has an air inlet. An atomizer and a liquid-supply are in contact with each other. The air inlet, atomizer, and an aerosol passage are interconnected.

An electronic cigarette includes a shell and a mouthpiece. The external wall of the shell has an air inlet. An atomizer and a liquid-supply are in contact with each other. The air inlet, atomizer, and an aerosol passage are interconnected.

Embodiments of the inventive concept provide a high-capacity, sparkless, mobile, double-insulated wood pellet burner unit. The wood pellet burner unit is safely operated on a wood floor or deck. The wood pellet burner unit produces a large radiant flame that enhances the surrounding area, free from dangerous sparks and smoke. The ash and coals from the fire are enclosed within a double-insulated housing. A wind break radiant heat reflector protects the flame from being distorted, enhances the flame so that it remains in a substantially upright column, and reflects some of the heat outwardly toward the users. Casters disposed on the bottom of the wood pellet burner permit easy and convenient movement of the unit. The wood pellet burner unit disclosed herein produces a larger and fuller flame than a pure gas fire pit based on a balanced multi-directional flow of heated combustion air flow through the unit.