Does the unit control the flow of water or temperature?

The SaniTimer® does not use a solenoid coil to control water flow nor does it control or monitor water temperature. The water flow is completely controlled by the user and on the sink hot and cold water knobs. To dispel a common myth, water temperature actually does not affect hand hygiene efficiency at all, it is solely for personal preference. For temperature to even be a legitimate factor, the water would have to be so hot as to burn any user instantly, and this will obviously never be the case.