27
Part Number 550-110-832/1014
OWB & OWT
Series 2
Oil-Fired Water Boilers –
Boiler Manual
14 Ratings
AHRI Certified Ratings
Boiler
Model
(7)
Burner Input
Heating
Capacity
Seasonal
Efficiency
Net
Rating
(water)
Boiler
Water
Content
Flue
Outlet
Diameter
Minimum
Chimney
Draft
Loss
Thru boiler
GPH MBH MBH
(1) (2) (3)
AFUE
%
MBH
(4)
Gallons
Inches
(5)
Rect
In
Round
In
Height
Ft
In W.C.
(6)
OWB/OWT3-T-S2
0.70
98
86
86.4
75
10.9
7
8 x 8
6
15
0.010
OWB/OWT3-T-S2
0.95
133
115
85.0
100
10.9
7
8 x 8
6
15
0.020
OWB/OWT4-T-S2
1.00
140
122
86.2
106
13.4
7
8 x 8
6
15
0.010
OWB/OWT4-T-S2
1.20
168
145
85.0
126
13.4
7
8 x 8
6
15
0.010
OWB/OWT5-T-S2
1.20
168
147
86.1
128
15.9
7
8 x 8
7
15
0.010
OWB/OWT5-T-S2
1.45
203
175
85.0
152
15.9
7
8 x 8
7
15
0.015
OWB/OWT6-T-S2
1.40
196
171
86.0
149
18.4
7
8 x 8
7
15
0.010
OWB/OWT6-T-S2
1.75
245
212
85.0
184
18.4
7
8 x 8
7
15
0.015
Notes
1. MBH refers to thousands of Btu per hour.
2. Base on 140,000 Btu per gallon.
3. Based on standard test procedures prescribed by the United States Department of Energy, with combustion conditions of
13.5 % CO
2
.
4.
Net ratings are based on net installed radiation of sufficient quantity for the requirements of the building and nothing need be
added for normal piping and pickup. Ratings are based on a piping and pickup allowance of 1.15. An additional allowance
should be made for unusual piping and pickup loads.
5. See page 6 for minimum breeching diameter.
6. Listed draft losses are for factory-shipped settings.
7. OWB and OWT boilers are ASME rated for 50 psig working pressure.
®
DOE
