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Xtreme™ is a family of high-input, fast recovery commercial water heaters that complies with Low NOx Emissions

Features & Benefits
Xtreme is an advanced line of fast recovery commercial gas water heaters. These products can deliver up to 756 gallons per hour at 100 degree F rise. The small jacket diameter makes it a popular choice for retro fits and it is a versatile choice for new construction. Models range from 500,000-715,000 Btu/h, with a maximum temperature setting of 180 degrees Fahrenheit.

Space Saver Design
Xtreme maximizes installation adaptability by offering models with front and rear inlet/outlet water connections. Short heights and small jacket diameters result in greater installation flexibility.

System Sentinel™ LED Diagnostic System
Our exclusive diagnostic system, with glowing LED lights, verifies system operation sequence by sequence.

Patented Multi-Flue Tank Design
Proprietary steel formulation, patented multi-flue design, and two coats of high temperature porcelain enamel maximize corrosion resistance and result in a superior heat exchanger design.

Automatic Flue Damper
Low profile design minimizes overall product height. Heavy duty vent hood supports are designed to withstand rigors of installation.

Specialized Burner Assembly
Each model features five premix burners mounted into a metal face plate and sealed with a Viton gasket. Patented “quick release” manifold for easier service.

Direct Spark-to-Pilot Ignition System
Energy saving ignition that ignites pilot only when there is a call for heat. Round Premix Burners Precision burners are formed from high chromium stainless steel.

Low NOx Emissions
GX90-550 and GX90-640 meet Low NOx emissions of less than 40 ng/J.

Full-port, Full-flow Drain Valve
Factory installed brass drain valve allows for faster draining and servicing.

Altitude Certifications
Standard Natural and LP models are certified up to 2,000 feet. High altitude models, 8,000 feet.

Anode Rods
Patented design utilizes multiple magnesium rods to ensure long life and corrosion resistance. 

90 GX90-550(A) 550,000 NAT
90 GX90-640(A) 640,000 NAT
90 GX90-715(A) 715,000 NAT
90 GX90-500(A) LP 500,000 LP
90 GX90-600(A) LP 600,000 LP
90 GX90-680(A) LP 680,000 LP

(A) Indicates available ASME mode

  • High-input – 550,000 - 715,000 BTU/hr.
  • Available in 90 gallon capacity
  • Space-saving tank design
  • Low profile automatic flue damper


Revit Model (GX90, 500, 715)
Specification Sheet
Use and Care Manual
Warranty Information


Tank Warranty - 3 Years
Parts Warranty - 1 Year

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