The VE-200 is good because you can use the 2nd probe as a backup, or for a different UTH. Since you are running only one tub per output, I would try to get the x4 from VE. this way you can control all of them from one. Or you can get 2 of the x2 version. Personally I would get 2 x2 versions. this way if one fails you don't lose them all.
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