eduardo Posted March 18 Report Posted March 18 The connections look the same, but vendors caution that the 720 is systems with NO separate recirc. It seems like the (much cheaper!) 726 model might work, even for no-recirculate systems like the J235 ? I did notice the PROM program is different 720 is v5.x 720 is 3.x , I suspect that is the only difference (for which you pay another $150 !) Quote
Spa Board Doctor Posted March 29 Report Posted March 29 The programming is different on these and they are not interchangeable. One is programmed for a circulation pump for the heater. The other uses a 2-speed jet pump for the heater. Quote
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