Unit heaters or hot air generators are thermal machines that generate heat directly in the volume where they are installed. Here, no distribution system of the heat transfer fluid, we speak then of decentralized heating systems. The flame is generated inside the heat exchanger and the heat is extracted outside the heat exchanger to heat the room. This type of heating is particularly suitable for industrial buildings, livestock, horticulture as well as in the construction industry or events. The fuel supply of the device is done via a gear pump or a gas block which also acts as a safety device to cut off the fuel supply in case of uncontrolled phenomenon. The quality of this component is essential to ensure safe use for many years.