Described is a system and method for receiving a data packet including a destination address and a source address, the data packet corresponding to a port number, assigning an address risk value for the data packet based on the source address and a port risk value for the data packet based on the port number. The furnace includes a plurality of burners grouped into at least first and second groups, each group connected to a source of combustible gas through a control valve. The invention has functions of interrelating the identification information with location information of the terminal when the services are received and of storing both kinds of information.