Regenerative burner is a product of new combustion technology for realizing higher thermal efficiency and lower emissions, moreover utilizing very high preheated air temperature up to $1,000^{circ}C$. In this study the experimental study was carried out to find out a combustion characteristics breaking the old combustion concept. From the variation of configuration of gas nozzle and hot test on the temperature distribution and NOx, CO, it was found out that the performance of regenerative burner was better than that of existing burner, mainly due to the effect of internal gas recirculation.