Visit us at www.calspas.com. Cal Spas Hot Tubs, Spas and Swim Spa for Sale. Adjustable Therapy System (ATS). When shopping for a hot tub, be sure you take the warranty into consideration. While other brands offer warranties that last only 1 or 2 years, our quality hot tubs feature limited warranties for up to 10 years! In addition, we offer a network of authorized dealers who are standing by to ensure years of worry-free enjoyment.