
Part number 550-100-090/0809
53
gas
-
fired
water
boiler
—
Boiler Manual
AD
VANCED INST
ALLA
TION
Sizing direct-connected DHW piping
(continued)
Pump curves for typical circulators suggested for DHW loop
Figure 55
Figure 54
Pipe sizing and head losses for DHW
applications
(H1=Ultra boiler head loss;
H2=piping head loss)
Flow
rate
Temp
rise
Pipe
size
H1
H2
GPM
°F
Inches
Boiler head
loss
Feet w.c.
Piping head
loss
Feet w.c.
Ultra-80 (71,000 Btuh output)
7
20
1
6 6
2 7
9
16
1
11 6
4 2
10
14
1¼
14 6
2 5
Ultra-105 (94,000 Btuh output)
7
27
1
7 0
2 7
9
21
1
11 2
4 2
10
19
1¼
13 6
2 5
13
14
1¼
22 2
3 9
Ultra-155 (139,000 Btuh output)
9
31
1¼
6 2
2 1
10 0
28
1¼
7 7
2 5
13
21
1¼
13 3
3 9
16
17
1¼
20 5
5 7
Ultra-230 (207,000 Btuh output)
13
32
1¼
9 4
3 9
16
26
1¼
13 7
5 7
21
20
1½
22 0
2 9
Ultra-299 (279,000 Btuh output)
18
31
1½
6 6
2 2
22
25
1½
9 5
3 1
29
19
2
17 4
2 9
Ultra-399 (365,000 Btuh output)
22
34
1½
9 5
3 1
29
25
2
15 5
2 9
36
20
2
22 8
4 3
A
B & G PL-36
B
Taco 0011
C
Taco 0010
D
Taco 007
K
Taco 1400-30
Taco 2400-30
E
Taco 0013
F
Grundfos 43-75
G
Taco 0014
H
Grundfos 15-42
J
Taco 1400-20
Taco 2400-20
L
Taco 0012