Energy recovery devices, systems and methods, and energy recovery control systems and methods for efficient extraction and reuse of waste heat from exhaust fumes generated from cooking appliances. Each thyristor has a lower conducting surface that is electrically connected to one of the input lines and an upper conducting surface that is electrically connected to one of the output lines. The synthesized harmonic component representation and the non-harmonic component are then used to compute a harmonic to non-harmonic ratio. The prosthetic graft has a long-term patency and success rate that is superior to other previously described prosthetic grafts designed for such use. According to the method, the customer first enters a username and password to gain access to the host service provider. The processing gas includes an ozone-containing gas having a volume ratio of O3 to a total volume of O2 and O3, ranging 50% or more.