2
ROUGH-IN DIMENSIONS
Figure 1.
IMPORTANT!
Refer to "Installation Clearances" section of manual
(page 7) for recommended service clearances prior
to boiler placement.
TOP VIEW
LEFT SIDE
TABLE 2. ROUGH - IN DIMENSIONS
A
B
C
D
E
F
Model
Inches
c m
Inches
c m
Inches
c m
Inches
c m
Inches
c m
Inches
c m
GW/GB-1000
14.1
35.8
12.2
31.0
40.3
102.4
31.6
80.3
26.0
66.0
46.8
118.9
GW/GB-1300
24.8
63.0
12.2
31.0
40.3
102.4
31.6
80.3
39.3
99.8
57.3
145.5
GW/GB-1500
30.2
76.7
12.2
31.0
40.3
102.4
31.6
80.3
44.6
113.3
64.3
163.3
GW/GB-1850
27.7
70.4
11.2
28.4
43.0
109.2
32.3
82.0
44.0
111.8
78.3
198.9
GW/GB-2100
31.0
78.7
11.2
28.4
43.0
109.2
32.3
82.0
49.5
125.7
85.3
216.7
GW/GB-2500
38.1
96.8
10.5
26.7
43.0
109.2
32.3
82.0
56.5
143.5
99.3
252.2
Input
Exhaust
Inlet
TABLE 1: GAS AND ELECTRICAL CHARACTERISTICS
Manifold Pressure Electrical Characteristics
Model
Type of Gas Inches W.C. kPa
Volts/Hz Amperes
GW/GB-1000
thru 2500
NATURAL
3.5
0.87
120/60
30
GW/GB-1000
thru 2500
PROPANE
10
2.49
120/60
30
All Models - Maximum Supply Pressure: 14.0 In. W.C. (3.49 kPa)
Minimum Supply Pressure Natural Gas: 6.0 In. W.C. (1.22 kPa)
Minimum Supply Pressure Propane Gas: 11.0 In. W.C. (2.74 kPa)
Minimum Pressures must be maintained under both load and no load
(static and dynamic) conditions.
REAR VIEW
FRONT VIEW
BTU/Hr.
KW
BTU/Hr.
KW Vent Diameter Vent Diameter
Water Conn. Gas Inlet
Model
Natural Gas Natural Gas Propane Gas Propane Gas
Inches
c m
Inches
c m
Size
GW/GB-1000
990,000
289.95
990,000
289.95
10
25.4
8
20.3
2 1/2 NPT
2 NPT
GW/GB-1300
1,300,000
380.74
1,300,000
380.74
12
30.5
10
25.4
2 1/2 NPT
2 NPT
GW/GB-1500
1,500,000
439.31
1,500,000
439.31
12
30.5
10
25.4
2 1/2 NPT
2 NPT
GW/GB-1850
1,850,000
541.82
1,850,000
541.82
14
35.6
10
25.4
2 1/2 NPT
2 1/2 NPT
GW/GB-2100
2,100,000
615.04
2,100,000
615.04
14
35.6
12
30.5
2 1/2 NPT
2 1/2 NPT
GW/GB-2500
2,490,000
729.26
2,490,000
729.26
16
40.7
12
30.5
2 1/2 NPT
2 1/2 NPT
