| Comparison : | Item # GNU37-200, Universal™ Ultra-Low NOx Commercial Gas Water Heaters Item # GNU65-360(A), Universal™ Ultra-Low NOx Commercial Gas Water Heaters
 Item # GNU72-250(A), Universal™ Ultra-Low NOx Commercial Gas Water Heaters
 Item # GNU75-125, Universal™ Ultra-Low NOx Commercial Gas Water Heaters
 Item # GNU76-200, Universal™ Ultra-Low NOx Commercial Gas Water Heaters
 
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