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Guest speaker Julius Ballanco, P.E. and acclaimed plumbing columnist, describes how to properly install hot water recirculation systems that incorporate protective thermostatic mixing valves. He begins by giving an overview of the importance of scald protection, then moves to an overview of the various types of mixing valves available, their intended uses, and their corresponding ASSE rating. Using a unique technique of showing a series of piping schematics from simple to more complex, Julius describes the various components needed to allow consistent temperature delivery including check valves, balancing valves and temperature gauges and their proper placement and adjustment.