The Rheem Freeze Protection Heater, part number RTG20319DN, is a vital component for Rheem tankless gas water heater systems. This specialized heater prevents freezing by maintaining the optimal temperature of the unit in cold environments. Engineered for reliability, it ensures continuous operation even in extreme weather conditions, safeguarding the system from damage. Specifically designed for Rheem units, this freeze protection heater guarantees optimal functionality, providing peace of mind and uninterrupted hot water supply for residential and commercial applications.