Originally Posted by Conroe
I use a analog Johnson and it works perfectly. It's only drawback is it wont control a heater.
This is not true. You can remove the cover of the Johnson analog controller and move the lead to the internal switch to the opposite terminal. This will cause the controller to switch on with a fall in temperature rather than a rise. It's a double throw switch inside. The second terminal is concealed with a small rubber plug which you can very easily pull out. Simply move the wire and screw to the opposite terminal. This mod takes about 1.5 minutes total.
I have several of these in addition to the digital model and they work very well. Not as versatile as the digital, but reliably gets the job done and they are considerably less expensive.