Im one of those people that say its dangerous under substrate and you are wrong period.
You can hang a probe when under a RHP. But you put a probe under my boy thats 15’ and when he pisses a gallon of liquid with the best Thermostats on the market or not, within 5 min that piss is cooler than 91, submerges the probe and my Herpstat is running 100% and my RHP is running 170 degrees wide open.
Do what you want but don’t go against a thread on the safety of probe placement when new people read for good advice because you haven’t had a safety issue yourself.
I may not go down on my Bike very often, but i wear a helmet everyday because when you ride sooner or later you go down.
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