If you are installing a new standard shower, user height is one of the most important things to consider. Remember that all users should be considered–including children or seated bathers.
The temperature control should be placed about waist high, approximately 36" from the bottom of the shower enclosure. (For tub/shower systems, the temperature control will need to be placed 8"–18" directly above the tub spout.)
The shower head should be installed so that it is above the head of the tallest user, but still within the reach of the shortest user. Ideally, the tallest user should not have to crouch or duck under the shower head to rinse his hair, while the shorter user should be able to manually adjust the spray modes of the shower head.