The Series MI cast iron residential boiler from Peerless Heater Co. is fully packaged and ready to install. This atmospheric gas-fired hot water boiler is designed for natural draft use with a conventional chimney. The Series MI boiler can fire either natural or LP gas. Available with either standing pilot or intermittent ignition, the Series MI boiler exceeds the 80% AFUE federal standard for residential boiler efficiency. Intermittent ignition is provided by the Honeywell SmartValve System, which houses the safety and ignition functions in one device. Only when there is a need for heat does the ignition light the pilot, keeping costs low and eliminating the need for extra wiring and separate controls. Peerless Heater Co.