RE4000 Series Power Gas Burners Economite RE4400DS HTD Burner Capacity Range 20,000 to 400,000 BTU/HR Learn More Economite RE4400DS Burner Capacity Range 132,000 to 400,000 BTU/HR Learn More Economite RE4700BA, RE4400B, RE4400BA Burner Capacity Range 230,000 to 700,000 BTU/HR Learn More Economite RE4850BA Burner Capacity Range 280,000 to 850,000 BTU/HR Learn More