[en] A series of low pressure boiling lithium tests have been run to determine wall superheat. These tests were run primarily to identify the possibility of using boiling lithium as a first wall coolant in fusion devices. One of the major disadvantages of using liquid metals in a magnetically contained fusion machine is the large pump energy expended to force the liquid metal through the magnetic field. The large heat of vaporization for lithium would allow removal of the energy generated in the plasma with an order of magnitude reduction in pump energy. This experimental work has determined that the wall superheat is lower than predicted by extrapolation of existing equations to low pressure (2.6 Pa, 20 millitorr). This experiment also determined that the heat flux from a presently conceived design of a fusion reactor is easily removed with boiling lithium