8
84% EFFICIENCY (TYPE H)
HD101
13
0.7
13
44
8.8
4
17
1.2
HD151
13
0.7
20
44
8.8
6
25
2.9
13
0.7
HD201
13
3.3
26
44
8.9
8
33
5.2
17
1.3
HD251
13
0.7
33
44
9.2
10
44
9.2
21
2.1
14
0.9
HD301
13
0.7
39
44
9.4
12
25
3.1
17
1.3
13
0.7
HD401
17
1.4
40
44
9.8
15
34
5.6
22
2.5
17
1.4
302B
20
<1.0
25
90
9.8
6
50
3.1
25
<1.0
402B
20
<1.0
34
90
10.0
7
67
5.5
34
1.4
22
<1.0
502B
21
<1.0
40
90
10.4
9
84
9.1
42
2.3
28
1.1
21
<1.0
652B
27
1.1
40
90
10.8
12
55
4.1
36
1.8
27
1.1
752B
32
1.5
40
90
11.3
14
63
5.7
42
2.6
32
1.5
902B
38
2.2
40
90
11.7
17
76
8.3
50
3.8
38
2.2
992B
42
1.3
40
132
13.1
13
83
5.2
55
2.3
42
1.3
1262B
53
2.4
40
132
14.8
16
106
9.6
71
4.3
53
2.4
1532B
64
4.0
40
132
16.5
19
129
15.7
86
7.1
64
4.0
1802B
76
6.0
40
132
18.3
23
101
10.7
76
6.0
2002B
84
7.9
40
132
19.0
25
112
13.8
84
7.9
2072B
87
8.5
40
132
19.0
26
116
14.8
87
8.5
2342B
98
12.1
40
132
21.4
30
131
21.1
98
12.1
20°F
⌬
T
Pressure Drops
40°F
⌬
T
30°F
⌬
T
GPM
⌬
P Ft
GPM
⌬
P Ft
GPM
⌬
P Ft
Hi Delta
Model
▼
10°F
⌬
T
GPM
⌬
P Ft
Minimum Flow
GPM
⌬
P Ft
⌬
T °F
Maximum Flow
GPM
⌬
P Ft
⌬
T °F
Flow Rates
85% EFFICIENCY (TYPE
WH)
HD101
9
20
1.8
3.8
7
26
3.0
6.3
4
45
9.2
18.0
1-1/2”
HD151
13
20
1.8
3.8
10
26
3.1
6.3
6
45
9.2
18.1
1-1/2”
HD201
17
20
1.9
3.9
13
26
3.2
6.4
8
45
9.4
18.2
1-1/2”
HD251
21
20
1.9
3.9
16
26
3.2
6.5
9
45
9.6
18.5
1-1/2”
HD301
26
20
1.9
3.9
20
26
3.2
6.5
11
45
9.8
18.7
1-1/2”
HD401
34
20
2.0
4.0
26
26
3.3
6.6
15
45
10.3
19.1
1-1/2”
302B
13
40
2.0
5.1
10
52
3.3
8.3
6
90
9.8
23.7
2”
402B
17
40
2.0
5.1
13
52
3.4
8.4
8
90
10.0
23.8
2”
502B
21
40
2.1
5.2
16
52
3.5
8.6
9
90
10.4
24.2
2”
652B
28
40
2.2
5.3
20
55
4.1
9.7
12
90
10.8
24.7
2”
752B
30
42
2.6
6.0
20
63
5.7
12.8
14
90
11.3
25.1
2”
902B
30
51
3.9
8.7
20
76
8.4
18.6
17
90
11.7
25.5
2”
992B
28
60
2.7
5.2
20
83
5.2
9.7
13
132
13.1
23.6
2-1/2”
1262B
30
72
4.4
7.9
20
106
9.6
16.6
16
132
14.8
25.3
2-1/2”
1532B
30
86
7.1
11.9
20
132
16.5
27.0
20
132
16.5
27.0
2-1/2”
1802B
30
101
10.7
17.1
23
132
18.3
28.7
23
132
18.3
28.7
2-1/2”
2002B
30
112
13.9
21.6
26
132
19.0
29.5
26
132
19.0
29.5
2-1/2”
2072B
30
116
14.8
23.1
27
132
19.0
29.5
27
132
19.0
29.5
2-1/2”
2342B
30
132
21.4
31.8
30
132
21.4
31.8
30
132
21.4
31.8
2-1/2”
87% EFFICIENCY (TYPE H)
302BE
20
<1.0
26
90
9.8
6
52
3.3
26
<1.0
402BE
20
<1.0
35
90
10.0
8
69
6.0
35
1.5
23
<1.0
502BE
22
<1.0
40
90
10.4
10
87
9.7
44
2.5
29
1.1
22
<1.0
652BE
28
1.1
40
90
10.8
13
57
4.4
38
2.0
28
1.1
752BE
33
1.6
40
90
11.3
15
65
6.1
44
2.8
33
1.6
902BE
39
2.3
40
90
11.7
17
78
8.9
52
4.1
39
2.3
992BE
43
1.4
40
132
13.1
13
86
5.6
57
2.5
43
1.4
1262BE
55
2.6
40
132
14.8
17
110
10.3
73
4.6
55
2.6
1532BE
67
4.3
40
132
16.5
20
132
16.5
89
7.6
67
4.3
1802BE
78
6.5
40
132
18.3
24
104
11.5
78
6.5
2002BE
87
8.5
40
132
19.0
26
116
14.8
87
8.5
2072BE
90
9.1
40
132
19.0
27
120
15.8
90
9.1
2342BE
102
12.9
40
136
22.6
30
136
22.6
102
12.9
Less than Minimum Flow
Exceeds Maximum Flow
Exceeds Maximum Flow
MTS
Hi Delta
Model
▼
Soft
⌬
T °F
GPM
⌬
P Ft
SHL*
Water Hardness
20°F
⌬
T
Pressure Drops
40°F
⌬
T
30°F
⌬
T
GPM
⌬
P Ft
GPM
⌬
P Ft
GPM
⌬
P Ft
Hi Delta
Model
▼
10°F
⌬
T
GPM
⌬
P Ft
Minimum Flow
GPM
⌬
P Ft
⌬
T °F
Maximum Flow
GPM
⌬
P Ft
⌬
T °F
Flow Rates
Less than Minimum Flow
NOTES: 98% efficiency available with condensing heat exchanger. (See Specialty Models on pg. 4.) Minimum flow rates in closed systems may be reduced to a flow rate consistent with a 40°F
⌬
T.
Maximum flow rates are limited by maximum acceptable velocity through the heat exchanger tubes and may be increased by 10% for closed heating systems. Pressure drop would increase 21%.
*SHL = Calculated at 100 feet effective pipe length.
Less than Minimum Flow
Exceeds
Maximum Flow
Medium
⌬
T °F
GPM
⌬
P Ft
SHL*
Hard
⌬
T °F
GPM
⌬
P Ft
SHL*
85% AFUE
