Online resources such as Spa Depot and Ask the Electrician have hot tub schematics, simulators and wiring diagrams that give users a visual insight into the plumbing, filtration, circulation and jet systems in modern hot tubs. Other manufacturers, including Clearwater and Sonoma, feature schematics of individual models on their websites.
Many manufacturers allow customers to search for schematics online using their particular unit's make and model. Several models have extremely similar schematic models but may have slightly different electrical wiring components or water flow processes. These differences can often be investigated through analysis of the owner's manual that accompanies each new hot tub.