I've used VE's in the past. They are just fine get the VE200. Proportional pulse is better than on off. It will be more consistent which is desirable for a rack thermostat.
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You learn something new every day. I have actually never heard of proportional pulse and had to look it up. I'm using a ranco at the moment but once I build the racks in the summer I may look at VE or Herpstat when the time comes.