Sorry if this was already mentioned, but Rossi said on his blog this week that he might use a diathermic oil for heat tranfer in later versions of the eCat.
I cite this as an example: http://www.paratherm.com/InfoServices/index.asp?vendorid=6010&gclid=CIWOoM_R96sCFULrKgodmX3PuA Harry
