<p>The aim of the study is to analyzes the reliability of a parallel-configured system comprising two single-unit repairable heat exchangers: a Plate Heat Exchanger (PHE) and a Tubular Heat Exchanger (THE). The system remains operational as long as at least one system functions. In the event of a failure, a skilled server promptly repairs the damaged component, assuming constant failure rates and exponentially distributed repair times. The study employs the semi-Markov Process and Regenerative Point Technique (RPT) to evaluate system availability and Mean Time to System Failure (MTSF). By leveraging these methods, the study provides a more flexible and accurate evaluation of system performance compared to traditional Markov models. Additionally, the proposed model integrates cost–benefit analysis, providing insights into the financial viability of different maintenance strategies. Sensitivity analysis is performed to quantify the impact of failure and repair rates on system performance, aiding in the optimization of resource allocation. The results of this study have significant practical implications for sectors like manufacturing, energy, and healthcare that depend on highly dependable systems that are made up of and necessitate parallel systems.</p>