The water temperature you choose will depend on what kind of clothes you’re washing, your hygiene needs, energy efficiency considerations and garment recommendations. In order to kill dust mites, for example, your water needs to be 60 degrees celsius or hotter. If you’re trying to save on energy, a cold wash is the most energy-efficient temperature, and if your garments are delicate or likely to shrink when exposed to heat, this will affect which setting you choose.