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Universal™ is a family of commercial gas water heaters that are designed to fit intotight retrofit applications

Features & Benefits

The tighter the commercial retrofit, the more you will appreciate how the Universal’s compact size and multiple water connections simplify installations. Choose from 80% thermal efficiency models that range from 98,000-399,900 Btu/h and have maximum temperature setting of 180 degrees Fahrenheit.

Space Saver Design

The short heights and narrow jacket diameters, plus the top, front and rear water inlets/outlets offer the ultimate in installation flexibility.

System Sentinel™ LED Diagnostic System

Our exclusive diagnostic system, with glowing LED lights, verifies system operation sequence by sequence.

Patented Technology

Universal’s proprietary steel formulation, patented multi-flue design, combined with two coats of porcelain enamel, results in a superior heat exchanger design.

Stainless Steel Burners

Precision burners, raised port design, are formed from high chromium stainless steel. Each burner assembly slidesout like a drawer for quick inspection and maintenance.

Low Profile Automatic Flue Damper

Low profile damper minimizes overall product height. Heavy duty vent hood supports are designed to withstand the rigors of installation. Full-port, Full-flow Drain Valve Factory installed brass drain valve allows for faster draining and servicing.

Direct Spark-to-Pilot Ignition System

Energy saving ignition that ignites pilot only when there is a call for heat.

Altitude Certifications

Up to 5,000 feet for natural gas and 2,000 feet for LP; with high altitude certification kit, up to 8,000 feet.

Patented Anode Rods

Anode design utilizes multiple magnesium rods to ensure corrosion resistance for a long tank life.

  • Space-saving tank design
  • 98,000 - 400,000 BTU/Hr.
  • System Sentinel™ LED diagnostics
  • Multi-flue tank design


Brochure - Low NOx
Revit Model (G37-G100)
Revit Model (Low NOx - G37-GN100)
Revit Model (Ultra Low NOx - GNU37-GNU100)
Spec Sheet
Spec Sheet - Ultra Low NOx
Use and Care Manual


Tank Warranty: 3 Years
Parts Warranty: 1 Year