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Hot Spring will go to 106 as well...if you want extreme 107+ heat your probably limited to something with a mechanical heater that can be "adjusted" to run above recommended temps. I don't know of any new tubs that will go above 106 and I can't recommend trying to "rig" anything new...control boards are expensive to replace
107 to 110? That's extreme. 101, set it and forget it at my home. Getting overheated is a drag.
How do you "trick" it? Is it easy?
Water Boy, could you PM me regarding this?