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Anything under 15°C is low temperature for a dehumidifier and there is a risk of a traditional compressor based machine icing up because the air is cooled inside the dehumidifier until the water vapour condenses. The lower the ambient temperature the lower the temperature inside the dehumidifier and the closer to freezing you get.   especially when the ambient air is below 15°C.  The other factor is that compressor based machines extract less water out of the air the lower the temperature gets.  Therefore a machine that is rated at 16 litres per day at 30°C and 80%rh will extract about 3 litres per day when used in a garage at less than 10°C.  For most garages this will actually be fine and certainly enough to control the relative humidity to a reasonable level.

If you do have an application where there is little or no heating only ever buy a compressor based dehumidifier with HOT GAS DEFROST or a absorption based machine (see below).  The Mitsubishi Electric machines both have hot gas defrost, a special low temperature mode and auto-restart after a power cut, and can therefore be left unattended.

The X-Dry, DD122FW-MK3 and the Delonghi DNC65 are absorption based dehumidifiers.  This means that it has no compressor to freeze up in the first place.  This makes them quieter, lighter and cheaper.  They will extract a consistent amount of water (between 6 and 10 litres a day) regardless of the temperature and is therefore more efficient at low temperature than the two compressor models.  The X-Dry and the DD122FW-MK3 both have auto-restart functions after a power cut, the Delonghi DNC65 would have to re-started manually after a power cut, this is a consideration, especially if you are going to leave it on a boat.