Iron's thermal conductivity at 300 K is 80.4 W·m?1·K?1 Silver's thermal conductivity is 429 W·m?1·K?1 Iron's electrical conductivity is 18.00 %IACS (percent of International Annealed Copper Standard) or 1.044E+07 Siemens / meter Pure silver's is 108.40 %IACS or 6.287E+07 Siemens / meter Therefore, silver is a better conductor all around. Other materials are better or worse. It depends on what your definition of a good conductor is.
1) metal - YES 2) heat - YES
