To get a thermostat equivalent to a Herpstat 1 you have to get the VE-300. The VE-100 isn't proportional (it's a on/off style like the hydrofarm/Ranco) the VE-200 is proportional, but only pulse proportional (rapidly turns the heat source on and off to regulate the temperature. Like a on/off style thermostat on steroids) the VE-300 has dimming proportional control, which means that it actullly reduces the amount of power going to the heat source. Like an automated dimmer switch).
The Herpstat 1 has dimming proportional control, more safety features, can run lights/humidity systems, and fans.
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