Technology has contributed to the modernization of poultry processing plants with specialized machinery to meet this ever-increasing market demand and generate efficient, healthy, safe, and profitable production. In such facilities, scalding is an essential stage in chicken processing, as it is a factor that significantly influences the quality of the product. Technology has contributed significantly to the efficient execution of this process and offered added value in reducing resource consumption, such as electricity, water, and fuel. Despite the existence of this innovative technology, it is not achievable for all establishments, especially small-scale producers, since it is expensive considering the production-investment in machinery-sales ratio. This work focuses on studying the thermal behavior of a scalder by analyzing the combustion and heat transfer processes that occur during the scalding process. A non-premixed combustion analysis and a conjugate heat transfer analysis were performed using computational fluid dynamics. Experimental measures were taken in an existing scalder machine to validate the numerical results. The results are used to generate an improved design for this type of scalder used in small-scale producers with a sustainable approach.