The present invention provides a non-addressable notification appliance having multiple visual alarms such as strobes for notifying individuals of different types of detected events. A subcontracted processing service is determined to fulfill the request for communications service. When installed, the riser tower extends substantially from the seabed towards the surface with the buoyancy portion attached at a top end. Cells that pass verification and then subsequently fail verification can be subjected to further programming. In this structure, the heat exchanger may be made to be thinner, smaller, and lighter than known heat exchangers.