A steam trap having an electronic steam trap monitor for detecting a leak in the steam trap, characterised by said steam trap monitor comprising: a local power source configured to power the electronic steam trap monitor; a first temperature sensor disposed to measure a first temperature of a fluid released from the steam trap; a second temperature sensor configured to measure an external temperature of the steam trap; first measurement circuitry coupled to the first and second temperature sensors (238, 236) to provide a first representation of the temperature of the fluid released from the steam trap and an external temperature of the steam trap; signal processing circuitry operably coupled to the measurement circuitry to receive the first representation of the temperature of the fluid released from the steam trap and the external temperature of the steam trap; a wireless communication module coupled to the signal processing circuitry and configured to generate a wireless signal based on information received from the signal processing circuitry; and a casing, wherein the casing is thermally coupled to the steam trap, and wherein the first temperature sensor is within the casing and the second temperature sensor is external to the casing; wherein the signal processing circuitry is configured to store reference information relative to the first representation of the temperature and the external temperature of the steam trap obtained during a non-leaking operation, wherein the signal processing circuitry is configured to compare obtained temperature information with the stored reference information to selectively generate a steam trap leakage indication on the basis of said comparison; and wherein the electronic steam trap monitor is mounted proximate an outlet of the steam trap. a local power source configured to power the electronic steam trap monitor; a first temperature sensor disposed to measure a first temperature of a fluid released from the steam trap; a second temperature sensor configured to measure an external temperature of the steam trap; first measurement circuitry coupled to the first and second temperature sensors (238, 236) to provide a first representation of the temperature of the fluid released from the steam trap and an external temperature of the steam trap; signal processing circuitry operably coupled to the measurement circuitry to receive the first representation of the temperature of the fluid released from the steam trap and the external temperature of the steam trap; a wireless communication module coupled to the signal processing circuitry and configured to generate a wireless signal based on information received from the signal processing circuitry; and a casing, wherein the casing is thermally coupled to the steam trap, and wherein the first temperature sensor is within the casing and the second temperature sensor is external to the casing; wherein the signal processing circuitry is configured to store reference information relative to the first representation of the temperature and the external temperature of the steam trap obtained during a non-leaking operation, wherein the signal processing circuitry is configured to compare obtained temperature information with the stored reference information to selectively generate a steam trap leakage indication on the basis of said comparison; and wherein the electronic steam trap monitor is mounted proximate an outlet of the steam trap.