Fire you can see. Heat you can feel. The R3 gives you both, without the extra weight. The R1 gives you flame. The R4 gives you flame and heat. The R3 gives you flame and heat too - its A-Flame burner throws the campfire you came for, while the U-Tube BarCoal glows red-hot underneath, kicking out the same infrared heat as a bed of wood coals. Only now it comes in a frame you can still sling over one shoulder. At 19.6 lbs, it&';s still light enough to carry one-handed to your favorite spot, and tough enough to run at 1,100degF all night long. Less pit than the R4, more heat than the R1 - the R3 is the one that does it all. Burn Time: 6 hrs at full blast with 20 lb tank Burner: A-Flame Burner Heat System: U-Tube BarCoal Weight: 19.6 lbs Operating Temp: 1,100degF Dimensions (legs in): 18" x 11.98" x 5.82" Fuel Efficiency: Max 64,750 BTUs/hr Includes: 8-ft regulator hose Right in the middle of the line. Right at home anywhere.