Radiator EDR Ratings/ Square Feet PER SECTION Traditional Column or Tube type upright radiators Height Tube Per Section 13" 16" 18" 20" 22" 23" 26" 30" 32" 36" 38" 45" 3 Tube . . . 1.72 . 2.00 2.33 3.00 . 3.50 3.50 . 4 Tube . . . 2.25 . 2.50 2.75 . 3.50 4.25 . . 5 Tube . . . 2.67 . 3.00 3.50 4.33 4.33 5.00 6.00 . 6 Tube . . . 3.00 . 3.50 4.00 . 5.00 . . . 7 Tube 2.60 3.50 . 4.20 . 4.75 . . . . . 1 Column . . . 1.50 . 1.67 2.00 . 2.50 . 3.00 . 2 Column . . . 2.00 . 2.33 2.67 . 3.33 . 4.00 5.00 3 Column . . 2.25 . 3.00 . 3.75 . 4.50 . 5.00 6.00 4 Column . . 3.00 . 4.00 . 5.00 . 6.50 . 8.00 10.0 5 Column 3.00 3.75 4.50 5.00 . 6.30 7.00 . 8.50 . 10.0 . 1. Find the Sq Ft EDR per section above 2. Multiply by the number of sections altogether in that radiator to get Sq. Ft. EDR for the entire radiator 3. Multiply by 240 BTUs per hour to get the steam design output or Multiple by 170 BTUs per hour to get the hot water design output Forgot how to identify & measure radiators? Wall Radiator EDR Ratings All wall radiator may be composed of one or more flat wall hung sections. Each section can be best identified by measuring in inches its height, its width and its depth or thickness. Jot down those measurements then use the following chart to find the Square feet EDR of the section closest to those dimensions. Height Width Thickness EDR 13" 15 5/8" 2 7/8" 5 13" 21 7/8" 2 7/8" 7 22" 13 3/16" 3 1/16" 7 18" 29 1/16" 2 7/8" 9 29" 18 5/16" 3 11/16" 9 Wall Radiator 1. Find the Sq Ft EDR per section above 2. Multiply by the number of sections altogether in that radiator to get Sq. Ft. EDR for the entire radiator 3. Multiply by 240 BTUs per hour to get the steam design output or Multiple by 165 BTUs per hour to get the hot water design output Go Back to Explanation Forgot how to identify & measure radiators? E Mail your question to Colonial Cast Iron Baseboard Radiation BACK NEXT