A gas-fueled heating appliance having a system for reducing the amount of undesirable combustion products released to the site in which the appliance is installed. The method can include the operation of determining whether the antenna is directed in a keyhole. At least one of the obtained data chunks and derivatives thereof is sequentially accommodated in accordance with an order the obtained chunks are received, while keeping the association with the corresponding streams. Further, a compact SIThy capable of generating a short pulse can be achieved by reducing a gate-channel current-carrying area to a minimum.