The ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS) is a satellite instrument that advances water and ecosystem research by capturing land surface temperatures and estimating water loss from plants and soil, known as evapotranspiration (ET). Initial ECOSTRESS ET data revealed areas for improvement in the models' accuracy. This study describes recent updates to ECOSTRESS ET products and evaluates their performance against site‐level data across North America. We show an overall improvement from the initial ET product, although accuracy still varies depending on time of day, climate, and vegetation type. We also evaluate input data to the ET models and identify ways to further improve model performance. By providing accuracy metrics and guidance for data use, this work helps data users better understand ECOSTRESS ET products and supports future improvements in satellite‐based water and ecosystem monitoring.