Pentair Minimax NT Heater

If there isn't any spa suction line, then there isn't any way to heat only the spa without also heating the pool.

That plumbing is a mess. Replacing it all would be a good idea. However, you should find out as much as possible about what each pipe does before you take it out. My suspicion is that there is a spa suction line somewhere. If there is, it simply isn't plumbed to the suction side of the pump.
 
Okay got a guy that is going to take a look at my plumbing. He also said that I may have a high limit switch issue? Is this something that has to be replaced or something that may be able to be repaired?
 
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