I know next to nothing on this subject, but, how would a home brew heater pad work for this, these are the ones that people sit their "brew" barrels on to keep them at a constant temp. Could this be put under the foam in the EP box. The only down side is that i am unaware of being able to run them on 12V unless you use an inverter.
Meru, I may be interested on how you put this together for "next to nothing".
Cheers,
Andrew.
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