There is no need to add to what has been said. I will just make a comment I would recommend a Ultratherm UTH. They are regulated and designed no to exceed 100ºF it is still too hot to be unregulated but not hot enough to cause burns. They increase the safety margin quite a lot. There are others but I can not recall what brand name it is. Plan for the worst, ask your self what would happen if the T-stat fails? When the answer is the temps might hit 97-100 then you are far safer than the tub will melt, snake die and maybe start a fire answer. (the best answer is the secondary protection kills the power)
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