NBR - 2001/2002 Options Newmac Sealed Vent System (SVS) is the latest in venting design. The single wall balanced flue terminal jets flue gases away from the terminal head while preheating combustion air in a closed system. The Erie Boss 2400 provides a number of features that allow a wide range of control and diagnostics that optimize system efficiency for baseboard and in-floor radiant systems. The Erie Boss permits 4 heating zones, a priority zone for indirect water heater and is field expandable for additional zones. An optional low water cut off and outdoor sensor is also available. Newmac NBR Stand is designed to provide a convenient working height for easy maintenance of boiler and burner.