Hot tubs that draw power at 110 volts are usually preferred for small-scale, infrequent use by a single family. They have a number of drawbacks when compared to their more-powerful, 220-volt competition, and their mechanical components have a tendency to burn out sooner.
Because they can run directly off standard house current, the upfront cost of 110-volt hot tubs tends to be low. They do not typically require professional installation, and they draw less power than a 220-volt tub per unit time. They are underpowered, though, and many models are unable to run both their heating elements and water pumps simultaneously. These advantages and drawbacks make them ideal for backyard installation and infrequent use.