Heat pump dryer including a boost heater

A laundry appliance comprising:

• a cabinet including an appliance base;
• a basement supported on the appliance base, the basement including a basement inlet and a basement outlet;
• a drum rotatably supported in the cabinet;
• a drum motor operatively connected to rotate the drum;
• a heat exchanger arranged in the basement between the basement inlet and the basement outlet, the basement outlet connected in fluid communication with the drum, the heat exchanger including an evaporator having an evaporator coil and a condenser having a condenser coil;
• a refrigerant system connected in fluid communication with the heat exchanger, the refrigerant system including a compressor having a refrigerant inlet and a refrigerant outlet arranged in the basement, the compressor being configured to circulate an amount of flammable refrigerant through the evaporator coil and the condenser coil;
• a blower assembly including a blower motor operable to generate an airflow through the basement, the airflow passing in a heat exchange relationship with the evaporator and the condenser;
• and
• a boost heater arranged at the basement outlet between the heat exchanger and the drum, the boost heater being in a flow path of the airflow.