2
2
2
2
2
ROUGH-IN DIMENSIONS
TABLE 2, SPECIFICATIONS - CANADIAN MODELS ONLY
Maximum
Maximum
I.A.S.
Maximum
Max. Heat Transfer
Max. Heat Transfer
Model
Type of Gas
BTUH(KW)
BTUH(KW)
Heat Loss Load
Surface Area (Sq. Ft.)
Surface Area (Sq. Ft.)
HWB-300
Natural & Propane
300,000 (88)
247,200 (72)
210,120 (62)
1,410 (.41)
1,051 (.31)
HWB-399
Natural & Propane
399,000 (116)
322,790 (95)
274,371 (80)
1,829 (.54)
1,372 (.40)
HWB-420
Natural & Propane
420,000 (123)
344,400 (101)
292,740 (86)
1.952 (57)
1,464 (.43)
HWB-520
Natural & Propane
520,000 (152)
429,000 (126)
364,650 (107)
2,431 (.71)
1,823 (.53)
HWB-610
Natural
610,000 (179)
502,600 (147)
427,210 (125)
2,848 (.83)
2,136 (.61)
HWB-610
Propane
610,000 (179)
488,000 (143)
414,800 (121)
2,765 (.81)
2,074 (.61)
Ratings shown are for current modern heating system design. Where A.O. Smith boilers are connected to heavy, cast iron radiator systems or where unusual pick-up or
large size piping conditions exist, reduce ratings by 10%.
NOTE:
To compensate for the effects of high altitude areas above 2000 feet, the input, output and heating load ratings should be reduced
approximately 4% for each 1000 feet above sea level.
EXTRA OPENING
FOR THERMOMETER
AND RELIEF VALVE
HW/HWB-520, 610
AND HW--670
HW/HWB-610
AND HW-670
NATURAL GAS ONLY
TABLE 1
MODELS
Prop.
Nat.
HWB/
HWB/
HWB/
HWB/
HWB/
HWB/
HW-300
HW-399
HW-420
HW-520
HW-610/670 HW-610/670
A
Overall height
65 (1651)
57-1/8 (1451)
57-1/8 (1451) 68-5/16 (1735)
67 (1702)
64-3/4 (1645)
B
Height to top of jacket
43-1/4 (1099)
45-1/8 (1146)
45-1/8 (1146)
56-1/4 (1429) 56-1/4 (1429) 56-1/4 (1429)
C
Floor to center line water inlet
36 (914)
38-3/4 (984)
38-3/4 (984)
46 (1168)
46 (1168)
46 (1168)
D
Diameter of jacket
25-1/4 (641)
27 (686)
27 (686)
27 (686)
27 (686)
27 (686)
E
Floor to center line water outlet
12 (305)
12 (305)
12 (305)
12 (305)
12 (305)
12 (305)
F
Draft diverter outlet diameter
8 (203)
10 (254)
10 (254)
10 (254)
12 (305)
12 (305)
G
Floor to center line gas inlet
16-1/2 (419)
16-3/4 (425)
16-3/4 (425)
18 (457)
18 (457)
18 (457)
H
Overall depth
29-5/8 (753)
31-1/2 (800)
31-1/2 (800)
36-1/2 (927)
36-1/2 (927) 36-1/2 (927)
J
Support height
9 (229)
9 (229)
9 (229)
9(229)
9 (229)
9 (229)
K
Width of control string (approx.)
14 (356)
14 (356)
14 (356)
11(279)
11 (279)
11 (279)
L
Pipe size of water inlet (NPT)
1-1/4
1-1/2
1-1/2
2
2
2
M
Pipe size of water outlet(NPT)
1-1/4
1-1/2
1-1/2
2
2
2
N
Pipe size of gas inlet (NPT)
3/4
1
1
1
1
1
P
Control string plus 1/2 jacket dia. (approx.)
26-5/8 (676)
27-1/2(699)
27-1/2 (699)
24-1/2 (622)
24-1/2 (622) 24-1/2 (622)
Q
Water outlet to jacket
1 (25)
1 (25)
1 (25)
3-1/2 (89)
3-1/2 (89)
3-1/2 (89)
R
Water inlet casting to center line of jacket
10-1/8 (257)
11-1/4 (286)
11-1/4 (286)
12 (305)
12 (305)
12 (305)
S
Horizontal length between water inlet and outlet
5-3/8 (137)
5-1/2 (140)
5-1/2 (140)
5-3/4 (146)
5-3/4 (146)
5-3/4 (146)
T
Control string from jacket
5 (127)
5 (127)
5 (127)
7 (178)
7 (178)
7 (178)
Approx. shipping weight lbs. (Kilograms)
240 (109)
291 (132)
291 (132)
361 (164)
361 (164)
361 (164)
NOTE: All dimensions in inches (millimeters) except pipe size which is NPT.
DIMENSIONS IN INCHES
