There are several types of bathtubs, there is the conventional built-in bathtub, those that are made of fiber, and to be installed, a wall is made around it.
There is also the conventional fiberglass bathtub, but it is external, some are quite stylish and have turned feet.
In addition to conventional bathtubs, we have whirlpool bathtubs, they can also be external or built-in.
The traditional bathtub is simpler to install, it needs a water point and a sewage point. The hot tub is a little more complex, it involves the pump system to produce the water jets and a heating system.
Remember that each specific pump needs a type of circuit breaker, a type of power, a contactor. See what type of bathtub you are going to use to find out what system it uses, and then do the electrical and hydraulic according to the manual.
The bathtubs can be made of fiberglass, acrylic (cleaning is easier), resin, or even tableware. The hot tubs are designed with wood or resin imitating wood.
