Drying evaporates water from clothing and must remove that moisture from the air. Washer-dryers can condense it inside the system or vent moist air outside, depending on the design.
Heating and removing moisture are different functions
A fan moves air through the load. Heat promotes evaporation; after that, the system needs to remove moisture so the air can keep drying. The heat source and the removal method should not be confused.
| Design | Moisture removal | Condition to check |
|---|---|---|
| Water-cooled condensation | The vapor condenses through water cooling | Supply and exhaust during drying |
| Air-cooled condensation | Heat exchange with another air path | Ventilation and installation temperature |
| Venting | Moist air exits through the intended duct | Compatible outdoor outlet |
| Heat pump | A refrigeration circuit cools and then reheats the air | Condensate management and indicated maintenance |
The LG manual for the F4X7*FPY* family requires the cold-water tap to remain open during drying; GE documents a heat-pump combo unit. These examples show why it cannot be said that they all use water while drying.
What this means for space use
The manual must confirm the actual installed system and the access needed to clean the filters or the intended circuits. An integrated cabinet must respect its thermal conditions. Washer and dryer consumption is compared by phase and equivalent capacity.
If the unit stops drying as before, continue with poor drying diagnosis. The explanation of the mechanism does not authorize intervention in a refrigeration circuit.
Keep available the supplies and air paths required by the identified technology; do not copy the conditions of another combo unit.