For safety, it should be kept below 120 degrees F.
In general it depends solely on the temp setting on your hot water heater.
There should be a dial on the front of the heater that you set the temp. with.
change the temp setting on the heater a/c control head
Yes it needs to be on,and set for the lowest temp,and highest fan setting.
Shut off fuel supply. Allow to cool. Close the inlet and out let valves. Open the drain valve bottom of heater. Open the T&P to break Vacuum. Have a hose attached to dump water in a safe area. If you are draining heater to flush don't shut off fuel supply. On a power vent heater (pvc venting) you can turn the switch off. On a conventional heater with metal flue pipe turn to the vacation setting (lowest temp setting). when your heater is refilled you can switch on or turn temp setting to original position without bleeding gas and relighting. Waiting for a sitting heater to cool will take hours. You can run hot water in house with heater off until cold. You should not have an outlet valve on a hot water heater if you do remove it. Open hot water in building to vent. Opening and old T&P will weaken the spring even more so if hot water runs through it and may cause it to fail (drip) later with water on. Some drain valves drip later with water on have a 3/4 garden hose cap with washer for valve if it leaks as opposed to replacing drain valve.
The thermostat setting on the water heater controls the temp.
Someone turned up the thermostat, or the thermostat has failed. The thermostat tells the heater what temp to keep the water at.
There isn't a water control valve. The airflow is directed around the heater core by a door to control temp.
Could be, low on coolant, stuck open thermostat, plugged up heater core, faulty temp blend door actuator,
No, the inside temp is controlled by a temp door inside the heater box.
A malfunctioning thermostat, sediment buildup in the tank, or a lack of proper maintenance can cause a water heater to overheat. When the water in the tank exceeds the set temperature, it can lead to the water heater overheating.