SummaryMaintenance of normothermia is crucial to avoid patient morbidity. Newly released fluid warming devices have become smaller in size, but this change might impair efficacy. We performed an evaluation of the buddy lite TM and enFlow TM fluid warmers. We measured inflow and outlet temperatures of the devices at flow rates between 25 and 100 ml.min À1 using saline at room temperature or cooled to 10°C. At a flow rate of 25 ml.min À1 , the outlet temperature of the buddy lite was significantly higher than that of the enFlow (p < 0.0001), but at flow rates of 75 and 100 ml.min