Abstract: A spa with spa working components integrally molded into a foam spa body. Certain working components, including the water circulation lines, electrical lines, air jet lines and a pump/heater housing are pre-assembled over a female mold. The working components are maintained in spaced relation from the female mold by spacer means. A male mold is placed over the female mold, defining a foam cavity between opposing sides of the female mold and the male mold and fully enclosing the spa components therein. Expandable foam is introduced into the foam cavity, integrally forming the spa body and encasing the enclosed working components. The female and male molds are removed from the spa body, and a flexible liner is installed over inner and outer sides of the wall of the spa body. The pump/heater unit is installed within its housing and attached to the electrical and water lines therein.