Almost all pool & spa equipment is designed for a typical home environment.
If you have a Holiday Rental, AirBnB or other Commercial operation of your pool or spa, we *always* recommend you to have redundancy and spares. This includes filters, pumps, heaters, etc.
Pools & Spas in commercial usage have very different usage in comparison to a typical domestic household.
Coming from the Commercial Aquatics industry, when a pool or is absolutely needed to operate correctly, they have multiple backups. This should also be the case for smaller operators.
Commercial use varies between products, and warranty is typically far shorter, and covers less than domestic use.