most hot water units come with a thermostat that can be adjusted, also a tempering valve can be installed in the HWU outlet than mixes cold water into the hot water line at a desired rate/temperature which can be adjusted to set the desired temperature. If you have to ask, you should discuss this with your plumber!
if u take too long a hot shower, ur body temperature will adjust to the temperature of the hot water and its hard on your heart
Go to http://www.us.kohler.com/onlinecatalog/pdf/114811_2.pdf for the directions
I ran into this problem at my new house. You have to take the shower knob off and there will be instructions inside to adjust the water temperature. This is to protect children from getting burnt from turning the water on too hot.
On single handle shower valves, designed to let cold water first and turn handle farther to mix hot water to desired setting. If hot water turned on first, possibility of getting scalded. If seperate hot/cold handles for shower, shower valve needs work.
Your hot water line needs more insulation probably. It sounds like your hot water is cooling before reaching that faucet. It may be that the one faucet is not able to turn all the way to hot until you adjust the faucet (usually in the handle) of a 10 year old or newer faucet.
Replace the shower valve.
it depends on what your hot water level is
when hot waoter comes out of the shower you made have a water heater
if all the pipes in the house are the same size the easy answer is adjust the outflow valve on the hotwater tank until it matches the cold water pressure.
When you take a shower, you're mixing a combination of hot and cold water to make a comfortable temperature for the shower water. A toilet draws only off the cold water system. In older or poorly designed plumbing systems, when you flush the toilet, the cold water is pulled by toilet, so the water coming through the shower is only drawing from the hot water tank.
Your hot water heater is not large enough.
With combos of hot/cold combined. To adjust overall hot, you can do so at water htr.