Disclosed is a firepit topper having a plate having a top side and a bottom side, a central opening of the plate, a first channel partially surrounding the central opening, a second channel partially surrounding the central opening, and an end of the first channel that is offset with respect to an end of the second channel.

The combustion chamber subassembly comprises a top bell member defining an interior combustion chamber and an exterior, the top bell member including a top diffuser wall, a first side wall extending from the top diffuser wall toward the interior combustion chamber of the top bell member, a second side wall extending from the first side wall toward the exterior of the top bell member, and a gasket that is attached to the top bell member, contacting the first side wall and the second sidewall.

The present disclosure relates to a device for indirect heating by radiation in the form of a radiant housing having two front walls and two side walls and comprising at least one heat source, said radiant housing having front walls joining one another such that the housing has a lenticular shape in cross-section.

The present disclosure relates to a device for indirect heating by radiation in the form of a radiant housing having two front walls and two side walls and comprising at least one heat source, said radiant housing having front walls joining one another such that the housing has a lenticular shape in cross-section.

The present disclosure relates to a device for indirect heating by radiation in the form of a radiant housing having two front walls and two side walls and comprising at least one heat source, the radiant housing having front walls joining one another such that the housing has a lenticular shape in cross-section.

The present disclosure relates to a device for indirect heating by radiation in the form of a radiant housing having two front walls and two side walls and comprising at least one heat source, the radiant housing having front walls joining one another such that the housing has a lenticular shape in cross-section.

The combustion chamber subassembly comprises a top bell member defining an interior combustion chamber and an exterior, the top bell member including a top diffuser wall, a first side wall extending from the top diffuser wall toward the interior combustion chamber of the top bell member, a second side wall extending from the first side wall toward the exterior of the top bell member, and a gasket that is attached to the top bell member, contacting the first side wall and the second sidewall.

A coil assembly for a combustion chamber includes a first tube arranged into a plurality of inner coils and a second tube arranged into a plurality of outer coils that surround the plurality of inner coils. Each inner coil contacts adjacent inner coils. The plurality of outer coils are separated from adjacent outer coils by a plurality of spaces. The first and second tubes are configured to transport a heat transfer fluid (HTF). The plurality of inner coils are separated from the plurality of outer coils by a gap. The coil assembly also includes a cylindrical shroud surrounding at least a portion of the coil assembly. The cylindrical shroud has a length that is less than a length of the coil assembly.

A scalable pulse combustor that can be deployed as the heat exchanger in high efficiency, low NOx condensing boilers, water heaters and steam generators is provided. The combustor generally comprises an annular burner coil with a burner flange for accommodating the nozzle of a conventional burner/blower fitted into the central aperture thereof; a spaced-apart opposite annular spreader coil with a heat exchange hub fitted into the central aperture thereof; and a plurality of annular intermediate coils. Each of the burner, spreader and intermediate coils are preferably formed of spiral wound stainless steel tubing, with each winding directly abutting the preceding winding so as to create an annular wall. The heat exchange hub functions as a secondary heat exchanger with its own independently controllable coolant flow.

Example apparatus and methods providing for the improved chemical conversion of the combustible components of a gaseous medium are disclosed. In some examples, the apparatus includes a guiding body that guides the flow of the gaseous medium within a reaction chamber of the apparatus. In some examples, the guiding body of the disclosed apparatus is configured to stabilize a residence period of the gaseous medium in the reaction chamber. In some examples, the guiding body results in a flow path of the gaseous medium within the reaction chamber being optimized and/or maximized, and/or results in a short circuit flow of the gaseous medium in the reaction chamber being suppressed. In some disclosed examples, the guiding body causes at least a portion of the flow path of the gaseous medium within the reaction chamber to take the form of a cyclone flow.