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A. O. Smith Genesis boilers offer everything you could ask for in a non-condensing boiler. They provide the highest possible 84% thermal eficiency outstanding venting fexibility space-saving stackable design and a new advanced Energy Management Control (EMC) system. Genesis models are available for installation indoors (GW Series) or outdoors (GWO Series). Fan Assisted Pressurized Combustion SystemASME Rated Relief ValveFactory Installed All Bronze PumpCast Iron Glass Lined HeadersManual Reset High LimitHot Surface Ignition w/ Separate Flame SensorField Adjustable Top or Rear Air Intake ; Exhaust ConnectionsEMMC-5000 Diagnostic ControlsRemote Tank Sensor (Thermistor)Adjustable Pump DelayMounted Flow SwitchTwo-Stage Gas Firing System - Twin gas valve fring system prevents short cycling and ensures smooth operation saves fuel and extends boiler life. Prevents short cycling when demand is low delivers maximum output when demand is highCopper Fin Tube-Heat Exchanger 42.00 L. 30.00 W. 24.00 H.[]