Help! I have just moved into a new house and went to have a shower only to find there's no hot water!!

Sink has plenty and the water has plenty of pressure. The shower is a bar type with one end that controls the temp and the other turns the water on/off.. When I feel the bar it's boiling I just don't understand where the hot water is going?

Any help much appreciated.. Thank you

Can you post a picture of the shower valve? Sounds like a mixing valve that is clogged.