Can be stack but not recommended due to weight. If anything wrong they will charge you extra to lift it up and down

Manual says can

Heat pump dryer is 10- 15 kg more heavier than condenser dryer, one the website most is around at 50kg close to washing machine weight which is around 70kg, just not sure about the the stacking, cause this is the first time I’m stacking them.

Washer dryer combo, is never a wombo combo, especially for Malaysians who don’t use it most of the time, cause every time you use even without drying, you’ll end up deteriorating the heating elements and the electronics parts.

And most of us just buy heaviest load capability, put everything in for convenience, when you are supposed to separate clothing types and follow the number limits for each clothing type, going with washer dryer with the expectation of convenience when it’s not compared to hanging to dry