Williamson-Thermoflo GWC-070 Manual page 101

GWC -
gas fired water boiler
Dimensions and ratings
Engineering data — see page 99 for additional technical information
Figure 107
Boiler
Model
GWC-070
GWC-105
GWC-140
GWC-175
All GWC installations require a separate vent pipe and termination for each boiler.
Install and terminate vents as described in vent/air installation instructions in this manual.
Note 1
Combustion air piping can be individually piped or manifolded. See Figure 37, page 31, for manifolded air piping.
Part number 550-142-056/0411
— Boiler Manual
Water flow rate per boiler
GPM @ 20°F rise
6.5
9.7
13.0
16.1
(continued)
GPM @ 40°F rise
3.3
4.9
6.5
8.1
Vent piping cannot be manifolded
Vent/air pipe size —
Provide a separate vent
for each boiler
Note 1
3"
3"
3"
3"
.
101