Why is the hot water in bath/shower not nearly as hot as in the sink right next toit

Most recent tub and shower have a built in temperature limiting device. Can be adjusted to some extent.

If you tell us the brand and the model number of your valve we can tell you how to adjust the temperature setting, Thanks.

John

Both good ideas. This could also be caused by a partially blocked cartridge in the shower mixer. Has it always been like this or is some part new?