Rheem 100 Gallon Universal Commercial Gas 400,000 BTU Water Heater

Rheem 100-Gallon Universal Water Heater is designed to fit into tight retrofit applications and minimize the difficulty of replacing water heaters. Perfect for commercial applications requiring large amounts of hot water. ASME version.

  • Space-saving tank design
  • System Sentinel™ LED diagnostics
  • Multi-flue tank design
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SKU: R-100-G-G100-400 Category:

Water Heater Description

Rheem 100-Gallon Universal Water Heater with exclusive diagnostic system, with glowing LED lights, verifies system operation sequence by sequence. The short heights and narrow jacket diameters, plus the top, front and rear water inlets/outlets offer the ultimate in installation flexibility.

Manufacturer SKU: G100-400(A)

Manufacturer PDF: universal-universal-brochure

Water Heater Specifications




Natural Gas


Tank (whole house)

Tank Capacity (gallons)


BTU Input (british thermal units)


Ignition Type

Direct Spark Ignition

Energy Star


Water Heater Warranty

Waterheaters.com will honor all warranties in accordance with manufacturer policies and procedures. Manufacturer warranty issues should be addresses directly with the manufacturer.

3 Years on Tank, 1 Year on Parts