I would junk that zoomed thermostat asap, that thing is going to do the exact same thing as your last rheostat. What brand was your rheostat? Was it a dimmer or something you bought specifically for controlling reptile heating elements? I had a zoomed thermostat, if you're wondering what credibility I have.
The cheapest I would ever go would be a Ranco or a Johnson. I have Helixes and Rancos myself.
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