The term thermal fluid heater as used in this part includes any fired automatic auxiliary heating unit which uses a natural or synthetic fluid in the liquid phase as the heat exchange medium and whose operating temperature and pressure do not exceed 204 [deg]C (400 [deg]F) and 225 psig, respectively. Thermal fluid heaters having operating temperatures and pressures higher than 204 [deg]C (400 [deg]F) and 225 psig, respectively, are inspected under subpart 61.05--Tests and Inspections of Boilers.