What are the advantages/disadvantages of passively cooled coils?

The coils used with the PowerMAG system are in fact passively cooled, they utilize quality copper windings with excellent heat dispersion properties. The coils are then placed within a wax like medium that further enhances heat dissipation, as the coil heats up the internal medium changes to a liquid state effectively “absorbing” much of the heat. This is often desired over coils that require additional components for cooling (e.g. fans, pumps, and plumbing), and are considered more robust from an engineering perspective. Additionally there is no maintenance required for our passively cooled coils, nor is there any pre-defined factory set limit to the life of the coil in terms of number of pulses, nor age.