Remove existing and haul away. Install New 80MBTU 2-Stage Variable Speed S9V2 S9V2B080U4PSB. Set unit in place level, plumb, and secure, set on cork pads. Terminate electrical and gas connections. Re-route as necessary. Install shutoffs as needed. shut down hot main isolate home runs drain hot main remove existing humidifier shutoffs install new 1/2" 1/4 turn shutoffs