The aim is to create a facility which is carried out without operator intervention, operates without delay, does not require a connection to the mains and meets the requirements of the regulations on permissible pollutant emissions. The device consists of a control unit which is electrically connected to two temperature sensors and a door contact switch and actuates an actuator via an electric motor and transmission elements. The temperature detection in the flue takes place behind the outlet of the respective combustion chamber. The temperature sensors record the temperature change over time and the speed of the temperature change. The temperature target-actual evaluation serves to record the burning state of the solid fuel. The degree of the outgassing process is carried out by recording and evaluating the temperature rise or temperature drop over time. The target-actual temperature over time in comparison with comparative values for combustion optimization is carried out as an adaptive system. Thus, the respective nature of the solid fuel for the optimal combustion process is taken into account and the necessity of the new feed with solid fuel is determined via the program and displayed via a visual signaling device. The device is used for electronic control for a fireplace with lower burn. The invention relates to a device that does not require operator intervention, operates without delay, does not require a mains connection, and meets the requirements of the regulations with respect to permissible pollutant emissions. The device consists of a control unit which is electrically connected to two temperature sensors and to a door contact switch and which actuates an actuator by means of an electric motor and transmission elements. The temperature is detected in the flue behind the outlet of the combustion chamber. The temperature sensors record the change in temperature over time and the speed of the change in temperature. The temperature target/actual evaluation is used to record the combustion state of the solid fuel. The degree of the outgassing process is determined by recording and evaluating the increase or decrease in temperature over time. The target/actual temperature over time compared to comparative values for optimising combustion is an adaptive system. Therefore, the composition of the solid fuel is taken into account for the optimum combustion process and the necessity of the new charging with solid fuel is determined by means of the programme and displayed by means of an optical signal transmitter. The device is used for electronic closed-loop control for a fireplace comprising a lower combustion system.

A low-smoke carbon furnace including an outer casing, a removable liner, and an annular interlayer is provided. The removable liner is disposed in the outer casing. The removable liner is provided with a combustion chamber therewithin. The removable liner includes multiple secondary air inlets disposed on an upper side wall of the removable liner. The annular interlayer is disposed between the outer casing and the removable liner. A bottom end of the outer casing is provided with interlayer air inlets that communicate with the annular interlayer. Oxygen enters the annular interlayer via the interlayer air inlets, and thereafter enters the combustion chamber of the removable liner via the secondary air inlets to facilitate secondary combustion in the combustion chamber.

A firepit, having an outer shell having a first base and a first sidewall extending upwardly from the first base to a first top to define a first cavity; an inner shell disposed within the first cavity, defining a second base and a second sidewall extending upwardly from the second base to a second top of the inner shell that is level with the first top to define a second cavity, the second cavity defines a combustion chamber; a base spacer disposed between the first and second bases, a sidewall spacer between the first and second sidewalls, to define a plenum between the outer shell and the inner shell; a first air inlet port defined in the first sidewall; second air inlet ports defined in the second base so that an airflow through the first air inlet port flows through the second air inlet ports and into the combustion chamber.

A wood burning sauna stove includes an outer frame and a firebox inside the outer frame. The outer frame includes an upper frame wall, a front frame wall, a rear frame wall, and lateral frame walls connecting the front frame wall and the rear frame wall. The upper frame wall is designed to support sauna rocks. The firebox includes an upper firebox wall, a lower firebox wall, and a perimeter firebox wall. The perimeter firebox wall includes front, rear, and side firebox walls. An exhaust conduit is positioned between the upper frame wall and the upper firebox wall to heat the upper frame wall and the sauna rocks on the upper frame wall. The exhaust conduit has an exhaust inlet aperture in the upper firebox wall adjacent the front firebox wall and an exhaust outlet aperture in the upper frame wall adjacent the rear firebox wall.