The high heat transfer coefficient associated with boiling is attractive for increasing the thermodynamic efficiency of power and refrigeration cycles. Notably, the boiling heat transfer coefficient depends on the applied heat flux. The maximum heat transfer coefficient occurs prior to the critical heat flux limit, concurrent with the highest active nucleation site density. Here, we propose a technique to enhance the heat transfer in conditions where conventional pool boiling results in low active nucleation site density. A confinement wall above the boiling surface allows only partial departure of the generated bubble. Residual vapor pockets, or stem bubbles, act as a seed for subsequent vapor bubble generation without requiring nucleation. This technique enhances the heat transfer coefficient up to five time higher than the unconfined pooling boiling.