I have used both Ranco and Johnson thermostats successfully with both tubs and tanks. I have upgraded to Herpstats over the years because I like the proportional ones. I do still use a Ranco to run the space heater in my Reptile room. The thing to remember is this, the Ranco and Johnson thermostats were designed for more industrial and commercial type heating and air conditioning applications in mind, we have only adapted them to reptile applications. And, in most cases, they perform well. But, as with most anything mechanical or electrical, there is always a chance for failure. I know there are several people who use them as back-up thermostats for their primary thermostats, which are proportional.
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