Herpstats are very, very reliable, though I cannot comment on the 'Spyderweb' web enabled models as I've not used that line. I use Herpstat 2 and 4 models. They have a number of build in safety shutoffs that guard against probes coming loose and probes failing and sending bad signals, and can be set to provide only a percentage of max power (so, if you have 20 watt per foot tape, but want it to max out at only 10 watts, the stat can be set to do that).
Using PVC for the rack adds another layer of safety, since PVC is self-extinguishing (unlike wood or "melamine").
Using real snake tubs (I use tubs from Vision, and recommend them highly) adds yet more safety, since they have smooth bottoms and so don't knock probes loose or wear on the heat tape nearly as much as Sterilite-type tubs (which I do use some of also, and like about 10% as much as the Vision tubs).
" With the VE-300 and VE-300X2 if the setpoint is not reached for more than 30 continuous minutes the alarm will let you know- and shut off the power output!" Yeah, the 300x2 foolishly shuts down both channels so all your snakes freeze. I had that happen once; I don't buy VE thermostats anymore.
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