The VE200 can only control 1 heat source what you want is a Herpstat 2 (can control 2 heat sources) the Herpstat 4 (can control 4 heat sources) or the VE300 x2 (can control 2 heat sources. Personally I think theat you get more for your money with the herpstat line of thermostats.
Here is one of my Herpstat 4's
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