The study is concerned with the experimental investigation of the effect confinement ratio, swirl intensity and combustion intensity on heat transfer. The experimental tests were carried out on nine swirlers with different geometry. The swirl burner was built in o combustion system which was equipped with the necessary regulating and measuring devices. The fuel employed was commerical grade butane. The wall heat flux was obtained by direct measurement using a new technique for heat flux meter. Calculations of furnace efficiency were performed using numerical integration by Simpson's rule for heat flux distribution. The results obtained showed that, a moderate amount of swirl in a highly confined furnace created a relatively large reverse flow zone and cause the flame to spread rapidly to the furnace wall, consequently changes in wall heat flux, and furnace efficiency were observed. Correlation of data obtained may be useful for realising proper running of combustion systems and assisting to achieve optimal design for rreW combustion system.