Do you need a hose for a condenser tumble dryer?
Furthermore, does a condenser tumble dryer need a water supply?
You don't need a water supply for a condenser tumble dryer, as they collect moisture in a container within the machine. In fact you don't require a water supply for any of the tumble dryers.
Keeping this in consideration, can you use a vented tumble dryer without a hose?
That being said, a tumble dryer will work without a vent hose if it's free standing. This is evidenced by the fact that many vented dryers didn't even used to come with a vent hose. The potential problems with not venting a vented dryer in a garage are condensation and black mould when it's cold weather.
Tumble Dryers Need Air To Breath The first is that putting a condenser or heat pump dryer in a confined space with little or a restricted supply of fresh air is a non-starter. You cannot put it in a cupboard and close the door for example.