We are offering critical heat flux apparatus. Range of experiments: two successive regions of pool boiling phenomenon namely. 1. Natural convection boiling and accompanies the 2. Nucleate boiling. Can be visualized up to the critical heat flux point which is attained by slowly increasing the input to heater by the dimmerstat. At the critical heat flux point, the wire melts indicating maximum heat flux position. Vend I can be recorded at critical heat flux point.