51
Part Number 550-142-320/0720
GWA
Series 3
Gas-Fired Water Boilers –
Boiler Manual
Install GWA boilers for residential radiant panel systems, converted gravity
heating systems or other low water temperature applications per instructions
in this manual to avoid damage due to condensation.
GWA boilers are CSA design certified for installation on combustible flooring.
GWA boilers are ASME rated for 50 psig working pressure.
1. Based on standard test procedures prescribed by the United States Department
of Energy.
2. 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.
3. See information at right for model number suffixes. Letters shown are model
number suffixes. An “N” after the model number designates natural gas. An “L”
designates propane gas. The letter after the “-” designates the pilot ignition
system — “I” for spark-ignited pilot. For example, a suffix “L-I” means a propane
spark-ignited pilot boiler.
4. Contact your local dealer regarding information and parts for high altitude applications.
16 Ratings
AHRI Certified Ratings
Boiler
model
number
0-2,000 feet altitude
2,000-4,500
feet altitude
Heating
Capacity
Seasonal
efficiency
Net
Ratings
Boiler
water
content
Chimney
and
breeching
size
N - L
Input
(Btuh)
Output
(Btuh)
Input
(Btuh)
Output
(Btuh)
(Note 3)
(Note 1)
(Note 4)
Btuh
(Note 2)
AFUE%
Btuh
(Note 3)
(gallons)
Inches
GWA-038
38,000
32,000
34,000
29,000
32,000
84.0
27,000
1.5
4”I.D.x20”
GWA-067
67,000
56,000
60,000
50,000
56,000
84.0
48,000
1.5
4”I.D.x20”
GWA-100
100,000
84,000
90,000
76,000
85,000
84.0
73,000
2.1
5”I.D.x20”
GWA-133
133,000
112,000
120,000
101,000
113,000
84.0
98,000
2.7
6”I.D.x20”
GWA-166
166,000
139,000
149,000
125,000
141,000
84.0
122,000
3.3
6”I.D.x20”
GWA-200
200,000
168,000
180,000
151,000
170,000
84.0
147,000
3.8
7”I.D.x20”
GWA-233
233,000
196,000
210,000
176,000
198,000
84.0
172,000
4.4
7”I.D.x20”