Like stated earlier, all thermostats will run multipal tubs. Each thermostat is rated on how many watts it will safely handle. So with large racks or multipal racks, you would need to add up the number of feet of Flexwatt and times that by the wattage of the Flexwatt and compare. Proportional are the best (Helix, Herpstat and higher end Viviarium Electronics are) and good on/off's are Johnson's, Ranco's and the VE-100. Any of these will be great for a rack, but I would recommend a proportional for an incubator. When you are ready to get one, just try and plan ahead and get one that will fit your needs if you deiced to expand! Ones with multipal probes will be able to run various things at different temps.
hope this helps,
Dave
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