47
Part Number 550-142-785/0812
GWI
Series 2
Gas-Fired Water Boilers –
Boiler Manual
15 Ratings
Notes
1. See
information at right
for model number suffixes.
2. Based on standard test procedures prescribed by the United States Department of
Energy.
3. Net AHRI ratings are based on net installed radiation of sufficient quantity for the
requirements of the building and nothing need be added for normal piping and pickup.
Ratings are based on a piping and pickup allowance of 1.15. An additional allowance
should be made for unusual piping and pickup loads.
4. Vent size shown is for Category III venting (pressurized vent). See
page 8
for required
vent sizing when chimney draft (Category I) venting.
5. Contact your local dealer regarding information and parts for high altitude applica
-
tions.
Install GWI boilers for residential radiant panel systems, converted gravity
heating systems or other low water temperature applications per instruc-
tions in this manual to avoid damage due to condensation.
GWI boilers are CSA design certified for installation on combustible flooring.
GWI boilers are ASME rated for 50 psig working pressure.
Boiler
model
number
0–2,000 feet altitude
2,000–4,500 feet altitude
(Canada)
Net
I=B=R
ratings
(Btuh)
Boiler
water
content
(gallons)
DOE
seasonal
efficiency
(% A.F.U.E)
Vent
size
Input
(Btuh)
DOE Heating Capacity
(Output)
(Btuh)
Input
(Btuh)
Output
(Btuh)
(Note 1)
(Note 2)
(Note 5)
(Note 3)
(Note 4)
GWI-047
47,500
39,900
42,750
35,910
37,000
1.5
83.0
3”
GWI-063
63,000
52,700
56,700
47,430
49,000
1.5
83.3
3”
GWI-095
95,000
79,800
85,500
71,820
73,000
2.1
83.0
3”
GWI-127
127,000
106,000
114,300
95,400
97,000
2.7
82.7
3”
GWI-158
158,000
131,500
142,200
118,350
121,000
3.3
82.4
3”
GWI-190
190,000
157,700
171,000
141,300
144,000
3.8
82.1
3”
DOE
