I have taken the faucets and showerhead off and cleaned and soaked in vinager so just the pipe is coming out of the shower and I still have low Hot water pressure in the Bathroom only Should I start tearing the tile down to get to the pipes ? Or do I need a hot water heater? Please let me know. :confused:

Don't take a hammer to the wall yet. First a few questions: do you have hot water pressure at the bathroom sink and how about the rest of the house? Chances are good your mixing valve is plugged on the hot side but get back to us with more info.

Thanks for talking me down I will put down the hammer, the bathroom sink is the same as the shower Cold OK but Hot water side low. The rest of the house is fine.

This is pretty unusual. Has any work been done recently, valves turned, new appliances or water heater. It appears your bathroom hot supply line is partially blocked. There is also a small chance that some scale broke loose in the heater and plugged both the sink faucet and the shower. If you are handy shut off the main and open the supply line under the sink. There is usually a valve called an angle stop that can be opened. With a bucket and a rag in place have someone else open the main to see if you have pressure, be prepared! If you have pressure at the stop I betting on a plugged mixing valve, rare but it can happen.