Cal Spas Hot Tubs, Spas and Swim Spas for Sale. Cal Spas E974E Spa. The Cal Spas E947E is designed with spacious comfort and social get-togethers in mind. This 8-foot spa provides generous bench seating for up to eight adults -- perfect for hot tub parties! Liven up the evenings with conversation and togetherness as friends and family submerge in a huge whirling pool of bubbles. Visit us at www.calspas.com.