Response to The difference is the old model # had Gecko electronics inside & used a pressure switch, the newer models have Balboa electronics & use a dual sensor technology with no pressure switch. The dual sensors also mean you do not have to have a sensor well in the plumbing or in the spa shell for a temp sensor as both temp & hi-limit are at the heater. It also uses a cat 5 style cable for the topside control instead of the older phone jack style. The reason they switched was due to the topside control & the fact that most of the topside cable runs are over 25' so the new cable style eliminated any communication glitches between the system & the remote topside. see this link

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