A performance analysis carried out by Queen’s University, Belfast into efficiency of steam traps has shown that, over varying condensate loads and steam pressures, the GEM venturi trap, manufactured by Thermal Energy International Inc., is the most efficient steam trap available. The testing was undertaken under the supervision of Dr Gavin Walker BSc, MSc, PhD, Senior Lecturer in Chemical Engineering at Queen’s University, Belfast and carried out under BS EN 27841: 1991.