A.O. Smith Master-Fit commercial gas water heaters are now equipped with the new Eliminator(TM) self-cleaning cold water inlet device. The Eliminator automatically helps reduce sediment buildup by creating self-cleaning turbulence in the tank. This helps maintain high energy-efficiency throughout the unit's service life, and helps prevent premature tank failure. Master-Fit models are available with automatic flue damper (BTR) models, or with power induced draft design (BTI and low-NOx BTN models). A.O. Smith Water Products. Circle 8.