If you just need something basic, order a Herpstat from Spyder Robotics. I just ordered mine a few days ago.
Between it and the VE-200 they seem to be the best bang for your buck proportional thermostats.
Between ON/OFF and proportional thermostats:
When the temperature rises to/above the set temperature, the ON/OFF type shuts off the power to the unit until it drops below, and then turns it back on. From what I have read this can cause small fluctuations in temperature.
Proportional units adjust the power to maintain a constant preset temperature.
**Please correct me if I'm wrong, I don't even have my Herpstat yet, and I've only had a BP for two weeks. Go easy on me.
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