I am purchasing a heat press and the electrical requirements are stated below. I am considering this unit since it is listed as being able to connect to 110v outlet.
Not likely. 110V outlets are very limited in power - 1440W or 1500W at the very outside. A 20A "T-neutral" socket can give 1920W. Not even close.
We're seeing a lot of high-power appliances being marketed as "110V" - the purpose seems to be to trick Americans by implying they can plug it into a normal outlet, when that isn't going to happen due to the large power draw
"US Stock" simply means it ships from a US warehouse. Certainly built overseas.
The US is a 240V country and we have 240V readily available in our panels. As such,
any legitimate 4500W product will be 240V. Pulling that much power at 240V is easy. Pulling that much power at 120V is insanely hard and basically never done because it's hard. There's no reason to design a thing like that.
With the 125% thermal derate, you'll need a 50A circuit and a 50A socket. 50A/120V circuits are black swans, so nobody stocks the breakers, sockets or plugs, and they're overpriced oddballs. GFCI is out of the question (which you need in garages and basements). It will probably be cheaper to wire a circuit 50A/240V and then wire the 4-prong socket ignoring 1 of the hot wires. At least that is readily available.
The right answer is to get the 240V version. Twice the voltage half the current. That can plug into any 30A welder or 4-prong dryer socket of NEMA 6-30 or 14-30 type. If your dryer is 3-prong great time to convert it for better safety.