DEIs' home page = http://designengineering.com/

They don't have any technical papers or FAQs, just products and prices. On question, would the C02 "wear out"? I mean it is continually exchanging the heat from the fuel or air. Then after a period of time the C02 in the system wouldn't be "cold" anymore and the system would then have to be recharged. :dunno: Someone school me please.