I recommend replacing and repiping both supplies for the kitchen sink faucet. Both hot and cold have 1 emergency stop for 2 fixtures. The faucet has 1 hot and 1 cold and they also got to the dishwasher and the instant hot. I recommend repiping both but for now, only the hot is not working. This will replace the bad shutoff valve that isn’t allowing anything to pass through it. After repiping the hot side of the kitchen sink faucet, I tested all work for leaks and functionality. I also tested house pressure and tested the temperature of the hot water (seemed very hot to me). The water pressure on the front left side of the house was tested to be 75 psi. The temperature of the hot water at the single handle kitchen sink faucet was 149.2°. The water heater was set on A. This suggests the thermostat is running a bit high. I would keep an eye on the water heater and turn it down. 150° water can scald in less than 1 second. I would set the water heater to hot. ** All work to the kitchen is