A system for melting a substance may be provided. The system may comprise at least one burner probe. The at least one burner probe may comprise an absorber and a first wave guide configured to transmit microwaves. The absorber may be configured to receive the microwaves from the first wave guide and to convert energy from the microwaves into heat. The system may further comprise a second wave guide and a rotating wave guide. The rotating wave guide may be positioned between the first wave guide and the second wave guide. The rotating wave guide may comprise a plurality of sections configured to rotate about a central axis. The rotating wave guide may be configured to rotate approximately 90 degrees. For example, the rotating wave guide may comprise three sections wherein each one of the three sections may be configured to rotate approximately 30 degrees.