My family lives on the top floor 18, and the property says the water pressure is the highest. What kind of hose should I use? Someone suggested using hot water pipes instead. Is it necessary?

It's not necessary. Hot water pipes are only resistant to high temperature and aging, and the pressure resistance of water pipes is the same as that of cold water pipes.

Water supply for high-rise buildings usually has a pressure of about 8-9 kg. However, after arriving at the top floor, due to the pressure attenuation, the water pressure at home has been normal, and the water pressure is generally less than 2 kg. So it is usually enough to use six for indoor main water pipes and four for faucets and valves.