Selecting the optimal rehabilitation facility for a loved one struggling with heroin addiction can be an overwhelming task. This process requires an in-depth understanding of not only the intricacies of heroin addiction but also the rehabilitation landscape, the specificities of various therapies, and the potential trade-offs involved in different treatment strategies.

Heroin addiction, a chronic disease, is characterized by an uncontrollable search for and use of heroin, despite the harmful consequences. It causes changes in the brain's structure and function, leading to a cycle of cravings, withdrawal, and relapse. This powerful and complex disease necessitates a comprehensive treatment plan delivered within a supportive environment.

Rehabilitation facilities differ in approach and style, playing a significant role in the effectiveness of the treatment. Some adopt a holistic strategy, addressing the physiological, psychological, and social aspects of addiction. Others may focus more on medically-assisted detoxification or Cognitive Behavioural Therapy (CBT). It is crucial to consider these factors when choosing a rehab facility.

An optimal rehabilitation facility should offer a comprehensive treatment plan tailored to the individual's specific needs. This necessitates a thorough clinical assessment—an interdisciplinary process involving physicians, psychologists, and counselors who evaluate the individual's physical, psychological, and social health. This assessment aids in creating a targeted treatment plan, increasing the likelihood of success. It also helps to predict the potential obstacles, thus facilitating a proactive approach.

The location of the facility is another significant factor to consider. In certain instances, the proximity to the individual's habitual environment may trigger cravings and increase the risk of relapse. However, it's paramount to consider the socio-economic theory of gravity in this regard, which suggests that the interaction between two places decreases as the distance between them increases. In simpler terms, selecting a facility far from home might limit the frequency of family visits, potentially impacting the recovery process.

Furthermore, consider the facility's success rates. These statistics can serve as an indicator of the effectiveness of the treatment program. However, remember the Bayesian theorem, a principle in probability theory and statistics, which suggests that even a highly successful rehab center might not guarantee a successful recovery due to the complex nature of addiction.

The cost of treatment is another critical consideration. Here, the law of diminishing marginal utility comes into play. This economic principle implies that the additional benefit (in this case, the quality of treatment) derived from a good or service decreases as more of it is consumed. This doesn't necessarily mean that a more expensive facility will provide better treatment. Therefore, it's crucial to assess the cost-to-benefit ratio before making a decision.

Lastly, consider the rehabilitation facility's philosophy. This can range from religious-based programs to science-based treatments. A divergence in belief systems between the individual and the facility can be a hindrance to the recovery process. For instance, a person who does not subscribe to a particular faith might not benefit from a faith-based treatment program, no matter how successful it is with other individuals.

In conclusion, selecting the right heroin rehab facility involves a careful analysis of the individual's specific needs, an understanding of the different treatment strategies, and a consideration of factors such as location, success rates, cost, and philosophy of the facility. With a deep understanding of these components and the application of relevant theories, the chances of finding the optimal facility increase significantly. While the task might seem daunting, the reward—a loved one on the path to recovery—makes the effort worthwhile.