Why is there no hot water pressure in your bath tap but you have hot water pressure in the bathroom sink tap?

Answer 1

What is the age of the home? Some older homes used small pipes and after years the pipes can become partially blocked with mineral buildup. The vanity faucet distributes much less water than the tub. Note the outlet size of the vanity fauced versus the outlet size of the tub. If the flow rate is not available to the tub because of small pipes or other flow restriction the problem will show up as small flow rates at the larger faucets. Good luck, since increasing the flow rate can be expensive WHICHEVER problem it is. If your Plumbing to the tub is small, it will be expensive to replace. If the plumbing is blocked by mineral deposits, it will still be expensive.

Answer 2

There could be a clog in the bath tap's aerator or water filter, or there may be a problem with the faucet itself. Another possibility is that there is a blockage in the pipes leading to the bath tap. It's best to check these potential causes or consult a plumber for assistance.