The book "Maintenance in Furnaces Using Reliability-Centered Maintenance" provides a comprehensive introduction to traditional techniques for modeling and analyzing reliability and maintainability for non-repairable systems. It focuses on the preventive maintenance of heat treatment furnaces using the Reliability-Centered Maintenance (RCM) method. Additionally, it addresses a computer-based intelligence technique for optimizing reliability in sensor replacement in tempering furnaces. The work meets the requirements of ISO 9000 and ISO/TS/16949 standards and offers valuable insights into measuring system performance, particularly concerning the Mean Time to Failure (MTTF). The analysis relies on historical data for the calibration and replacement of thermocouples to estimate relevant parameters and determine the appropriate probability distribution for the model.