Weil-McLain Ultra Manual page 23

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gas fired water boiler
Install water piping
Figure 22
Pipe sizing and head losses for DHW
applications
(H1=Ultra boiler head loss;
H2=piping head loss)
Flow Temp Pipe
rate rise size
GPM °F Inches
Ultra-80 (71,000 Btuh output)
3.5 41 1
(min)
7 20 1
9 16 1
10 14 1¼
Ultra-105 (94,000 Btuh output)
4.5 42 1
(min)
7 27 1
9 21 1
10 19 1¼
13 14 1¼
Ultra-155 (139,000 Btuh output)
7.0 40 1¼
(min)
9 31 1¼
10.0 28 1¼
13 21 1¼
16 17 1¼
Ultra-230 (207,000 Btuh output)
10 41 1¼
(min)
13 32 1¼
16 26 1¼
21 20 1½
Ultra-310 (289,000 Btuh output)
14.5 40 1½
(min)
18 32 1½
21.5 27 1½
29 20 1½
Part number 550-100-066/0608
— Boiler Manual
(continued)
H1 H2
Boiler head Piping head
loss loss
Feet w.c. Feet w.c.
1.4 0.8
6.6 2.7
11.6 4.2
14.6 2.5
3.1 1.2
7.0 2.7
11.2 4.2
13.6 2.5
22.2 3.9
3.6 1.3
6.2 2.1
7.7 2.5
13.3 3.9
20.5 5.7
5.9 2.5
9.4 3.9
13.7 5.7
22.0 4.2
4.6 2.1
6.5 2.9
9.2 4.4
15.5 7.4
Figure 23
Pump curves for typical circulators suggested for DHW
loop
23