Carrier KFCEH3201F20 Electric Heater 322838 754 this unit draws power directly this unit draws power directly from the boiler control board interface once connected Professional protocol requires a full system shutdown and pressure relief of both the water steam media and the pneumatic actuator signal before disassembling the bonnet and installing this service kit to ensure technician safety and prevent seal damage Multi Stage Comfort: 3 stage operation allows for more precise temperature control and improved energy efficiency Always consult the air handler's data plate or installation manual to verify the maximum allowed heater kilowatt rating for that chassis