Most older taps use a soft washer which, when you turn the handle of the tap, is pressed down onto a valve seat in order to stop the flow.
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A device for controlling the flow of liquid, as from a pipe; tap
Nozzle is a noun which is defined as meaning a faucet or spout of a pipe or hose. Some synonyms for this word are tap and faucet. Other synonyms include spigot.
You say 'tap' .
That squeal you here is a very acute vibration that comes from the washer as it touches down on the base of the tap, it is normally caused due to very high water pressure.
Because you are using the Hot water faster than the boiler can produce it. Turn the tap/faucet off a bit. Get the proper sized boiler