Pool boiling heat transfer on a plain tube having R-22, R-124 and R-134a as working fluids are reported in the present investigation. Experiments are conducted at saturation temperatures of 4.4 degrees C and 26.7 degrees C and at reduced pressures of 0.1 and 0.2. It is shown that the Cooper correlation can predict the present pool boiling heat transfer data satisfactorily. In addition, a semi-analytical prediction method is proposed in this study; this semi-analytical model can not only predict the present data with success, but also give reasonably good accuracy with the experimental data from other researchers.