In short: Yes! A hot tub or swim spa can absolutely bump up your asking price. Like with all features of a home, however, the exact amount it adds can vary greatly. If you’re looking for a precise figure, however, you’ll need to consult a professional appraiser or real estate agent in your area.
As a general rule though, the amount of resale value a hot tub can add will depend on whether it’s portable or permanent, cheap or high quality, you live in a hot or cooler climate, and whether your neighborhood is geared toward hot tub ownership or not.