THERMOTANK Gas Tank Condensing Water Heater Condensing Gas Tank Water Heater Operates both NG and LPG Premix Burner Combustion with PWM Control Stainless tank. %104 efficiency with condensing technology Adjustable water temperature Economic mode option Freezing Prevention Sound alarm for inefficiency combustion Sound alarm for heatexchanger encrustation system Anti-bacterial protection Weekly and daily 21 time program. Cathodic Protection Safety system for without water operation. Over temperature safety system Vinleks artificial leather external cover External touch operated LCD display control panel Silent operation