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16
Model
6
7
8
80
10'
14'
17'
110
*
*
15'
150
*
*
*
220
*
*
*
299
*
*
*
301
399
*
*
*
Model
23
24
25
80
*
*
*
110
*
*
*
150
*
*
*
220
21'
23'
24'
299
16.5'
18'
20'
301
399
*
*
*
Table 4 - *Do not operate the boiler at these flow rates. These low or high flow rates will damage the heat exchanger or related
components. Damages due to improper operation ARE NOT covered by warranty.
The chart below represents various system design temperature rise through the boiler along with respective flows and friction
loss. This is provided to aid in circulator selection.
Model
Friction Ft
80
17'
110
25'
150
27'
220
19'
299
29'
301
399
39'
Table 5 - Temperature Rise, Friction Ft and Flow Rate
WHL-052 Rev. 4.28.16
Heat Exchanger Pressure Drop
Flow Rate in GPM and Corresponding Pressure Drop in Feet (Δ P')
9
10
11
12
21'
26'
*
*
17'
22'
25'
33'
*
12'
15'
17'
*
*
*
*
*
*
*
*
*
*
*
*
26
27
28
29
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
22'
24'
26'
29'
12.9'
13.6'
14'
15.7'
System Temperature Rise Chart
20°Δt
Flow Rate (GPM)
Friction Ft
8
11
15
22
29
39
13
14
15
16
*
*
*
*
*
*
*
*
19'
22'
27'
*
*
*
8'
10'
*
*
*
*
*
*
*
*
30
31
32
33
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
33'
36'
*
*
17'
18'
19.4'
21'
25°Δt
Flow Rate (GPM)
10'
6.6
9.1
17'
12.5
13'
18.3
18'
24.5
19'
32.5
17
18
19
20
*
*
*
*
*
*
*
*
*
*
*
*
11.5'
13'
15'
16.5'
*
*
*
13'
*
*
*
*
34
35
36
37
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
22.5'
26'
28'
31'
30°Δt
Friction Ft
Flow Rate (GPM)
7'
12'
13'
21
22
*
*
*
*
*
*
17'
19'
14'
15'
*
*
38
39
*
*
*
*
*
*
*
*
*
*
34'
39'
5.3
7.3
10
14.6
20
26
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