The C45 is similar in size and configuration to the Geneva, but with 2 fewer jets, no circ. pump, different controls, and a slightly less extensive warranty (if I remember correctly).
It is a 'special' model for certain dealers, and because it's not available to every dealer, it's not on the Caldera site.
At my local dealer, it is priced $1500 less than the Geneva (which they sell for $9000).