Den 2007-10-01 20:40:12 skrev Russell McMahon : > - It is MORE efficient than a resistive heater as you are using a heat > pump. You get more than 100% "efficiency" wrt the electrical input > energy ! But.. if yoiu want to then *keep* it hot, also calculate with the back-flow of heat through th epeltier to the cool side. for keeping somethin hot, you may end up needing more power for a peltier, then you would with a resistor. -- Morgan Olsson -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist