Product Overview
*The .80 GPH firing rate is achieved by changing the burner nozzle, refer to burner instructions or
boiler’s rating label for correct selection. For Beckett AFG, also use the burner low fire rate bae
included in burner carton.
8"x 8" 8"x 8" 8"x 8" 8"x 8"Chimney Rectangle
6" 6" 6"
6"
Chimney Round
15' 15' 15' 15'Chimney Height
15.00 Gal. 15.00 Gal. 18.25 Gal. 21.50 Gal.Water Volume
636 636 737 852
Approximate Shipping Weight
DATA
UO-3RE*
UO-3E
UO-4E
UO-5E
1 ½" 1 ½” 1 ½” 1 ½”Supply Tapping
1 ½” 1 ½” 1 ½” 1 ½”Return Tapping
37" 37" 41" 45"Depth-With Burner (B)
25" 25" 29" 33"Depth-Boiler (L)
DIMENSIONS
UO-3RE*
UO-3E
UO-4E
UO-5E
DIMENSIONS
RATINGS
RATINGS
0.80 1.00 1.20 1.40
Burner Capacity (GPH)
112 140 168 196CSA Input (MBH)
99 123 148 173DOE Heating Capacity (MBH)
86 107 129 150Net Ratings (MBH)
87 87 87 87
DOE Seasonal Eciency AFUE (%)
.000 .020 .025 .040
Draft Loss Through Boiler
(inches wc)
UO-3RE*
UO-3E
UO-4E
UO-5E
In the interest of continual improvements in product and performance, Weil-McLain reserves the
right to change specifications without notice.
WM1409_BRO_015_ULTRA OIL