What is the advantages of a sealed heating system and disadvantages?

A sealed heating system offers several advantages, including improved energy efficiency, reduced risk of contamination, and consistent pressure maintenance, which can lead to fewer maintenance issues. However, disadvantages include the potential for higher installation costs and complications in repairs, as leaks or failures can be more challenging to diagnose and fix compared to traditional open systems. Additionally, if the system becomes pressurized beyond its limits, it may pose safety risks.