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Burner
Size
Efficiency
124
132
140
148
*
Equivalent length based on straight length plus extra for elbows or "U"-bends as shown in the
illustration above. Tube lengths are for the listed efficiencies with the corresponding maximum in-
put. If desired, burner input, tube length, and net heat output may be reduced proportionally
while maintaining the same efficiency.
1. Use a draft breaking hood as shown. This makes burner
operation less susceptible to atmospheric conditions and
lowers the temperature of flue gases as they pass through
the roof. Provide access between the hood and the tube in
case a damper plate must be installed to prevent rumbling.
2. When multiple exhausts are manifolded together into a
common stack, alway use draft hoods and size the stack
to handle the total exhaust flow from all the burners, plus
dilution air. This prevents cross-feeding of pressure be-
tween tubes which can cause pilot difficulties, burner insta-
bility, rumbling and popping.
Figure 1– Immersion Tube Design
Add 1.5' (457 mm)
equivalent length*
for each elbow and
3' (914 mm) for each "U"-bend.
English Units
Capacity,
Tube
1000's Btu/hr.
%
I.D.,
Input
Output
Inches
60
1000
600
70
1000
700
75
1000
750
60
1750
1050
70
1750
1225
75
1750
1315
60
2750
1650
70
2750
1925
75
2750
2060
60
4000
2400
70
4000
2800
75
4000
3000
Figure 2 – Draft Breaking Hood
1.414 Times
The Actual
Pipe O.D.
Twice The
Actual
Pipe O.D.
Mitered bends may be used for any size immersion tube.
The double miter illustrated here is more efficient and has
less pressure drop than single miter configurations.
Dimensions apply to ACTUAL—not nominal—outside
diameter of the immersion tube.
Metric Units
Capacity,
Tube
Kw
Length,
Feet*
Input
Output
6
18
293
176
6
37
293
205
6
48
293
220
8
23
513
308
8
45
513
359
8
55
513
385
10
30
806
484
10
59
806
564
10
73
806
604
12
40
1172
703
12
69
1172
820
12
80
1172
879
Immersion Tank
* At least one pipe size larger than the tube exhaust.
See applicable codes for required size and height.
3
Angles Cut At
22.5° and 67.5°
Twice The Actual
Pipe O.D.
Actual Outside Diameter
Tube
Tube
I.D.,
Length,
mm
m*
152
5.5
152
11.3
152
14.6
203
7.0
203
13.7
203
16.8
254
9.0
254
17.7
254
22.2
305
12.2
305
21.0
305
24.4
Rain Hat
Stack*
Draft
Hood
Dilution
Tube
Exhaust
Roof
Air
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