Features of the RTGH-84XN Outdoor Condensing Tankless Water Heater

The Rheem Prestige RTGH series, including RTGH-84XN Outdoor Condensing Tankless Water Heater, is a group of high efficiency, condensing tankless gas water heaters designed for continuous hot water and 2-3 bathroom homes. The commercial conversion program chip upgrades the RTGH-84XN to operate at higher water temperatures for commercial applications.

  • Continuous hot water on demand
  • Energy efficient
  • Compact Size
  • Precise Temperature Control


  • Up to 94% energy efficient with stainless steel condensing heat exchanger
  • Intelligent electronic controls designed to increase energy efficiency and safety
  • Third party efficiency listed by AHRI
  • RTGH-84 for 2-3 bathroom homes – 8.4 gal./min. at 35°F rise, 6.6 gal./min. at 45°F rise — SCAQMD rule 1146.2 compliant
  • Compact space saving design – about the size of a medicine cabinet
  • Self-diagnostic system for easy installation and service



  • Parts Warranty – 5 Years
  • Labor Warranty – 1 Year
  • Heat Exchange Warranty – 12 Years