Spa ownership does mean that maintenance is your responsibility. Because everything breaks over time, spa parts will occasionally be needed to keep you tub up and running smoothly. Fortunately, there are a many parts suppliers available, both locally and online.
Pumps are one of the most commonly replace spa parts. A pump, no matter how well it is constructed, will eventually fail. However, as a general rule, these items are relatively easy to replace in most hot tubs.
One of the most important spa parts is of course the water heater. Without a properly functioning heater, a hot tub is just a big bowl of water. Again though, these items are fairly easy to replace when needed.