When you purchase a brand new hot tub, you can expect it to last anywhere from 5 to 20 years. Factors like the brand and model of your hot tub along with how well you maintain it through the years are all factors that will play into the overall longevity of your hot tub. Brand and model: Spending a little more on a mid to top-tier brand and model of a hot tub will add significant longevity to your purchase. Going with the cheapest model may save you money in the short term, but then you may have to purchase a replacement much sooner. Maintaining your hot tub: Half of contributing factors to the lifespan of your hot tub include the regular maintenance and upkeep of your spa. Here are some quick tips to increasing your hot tub's life span through regular maintenance and upkeep: Test your hot tub regularly to make sure your PH levels are balanced. Keep the PH level between 7.2 and 7.6 at all times. Use a hot tub cover to protect your spa from outside weather, debris, and UV light. Replace and clean your filters regularly. Fix pumps and make repairs right away. You can purchase the best and most expensive hot tub brand and model, but if you do not take care of it properly, you will be lucky if it lasts 5-years.