Hot tubs can add value to your home and make your home sell for more money when you decide to sell it.
However hot tubs will only add value to your home if they are an in the ground hot tub with nice landscaping around it that is professionally built.
The portable hot tubs are just considered to be personal property and do not add any value to your home.
So if you have a portable hot tub and you plan to sell your home then it's probably best to remove the portable hot tub.
But adding a permanent hot tub to the property as in in the ground hot tub can add significant value to the home.