ESG-64 Outdoor Tankless Gas Water Heater

Ultra low NOx, mid-efficiency tankless gas water heaters designed for endless hot water.


  • 0.82 EF with all-copper heat exchanger
  • Intelligent electronic controls designed to increase energy efficiency and safety
  • Water savings setting – upon activation, this setting can save homeowners up to 1,100 gallons of water per year1 by decreasing the flow of water through the pipes until the temperature reaches the heater’s set temperature
  • Low flow fixture compatible – Industry-first minimum flow rate of 0.26 GPM and minimum activation flow rate of 0.40 GPM ensures the user will receive hot water even in low demand situations
  • Recirculation Pump Kit-Ready – Quickly pairs with our Recirculation Pump kit to provide instantaneous hot water at the tap
  • 1/2” Gas line compatibility on every model
  • Maintenance Notice Setting alerts homeowner – flashing a warning code to call for service check
  • Self-diagnostic system for easy installation and service
  • Digital display shows temperature setting and maintenance codes
  • 3”/5” concentric vent system with Integrated condensate collector
  • Connects to Metal Fab. Inc., 3”/5” concentric venting without an adapter
  • Hot-start programming helps minimize fluctuation in water temperature, referred to as “cold water sandwich”, during periods of frequent on/off operation
  • Guardian OFWTM overheat film wrap
  • EZ-LinkTM cable available for higher demand applications to connect two tankless units to operate as one
  • High-altitude capability – up to 8,400 ft. elevation above sea level3
  • Environmentally friendly ultra low NOx burner meets SCAQMD rule 1146.2 requirements

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