Flow boiling is a liquid–vapour phase change heat transfer process with significant potential for next-generation thermal management systems. It is more complex than pool boiling due to the interaction of convective flow and boiling mechanisms. Flow boiling in parallel microchannels is widely applied in high-power electronic cooling, electric vehicle battery thermal management, laser cooling, and miniature refrigeration systems. Hence, understanding flow regimes, bubble dynamics, and heat transfer enhancement in microchannels is essential. In this study, a high-speed camera is used to visualise bubble dynamics and flow maldistribution, while an infrared (IR) camera captures the surface temperature distribution and identifies temperature non-uniformity. The initial phase of this work focused on developing and validating an IR thermography-based technique for field measurement of temperature and heat flux in single-phase and pool boiling conditions on microchannel surfaces. The figures illustrate the experimental setup and assembly of test section.