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AHRI Certied Ratings
Boiler
model
number
0 - 2,000 feet
Altitude
2,000 - 4,500 feet
Altitude
Heating
Capacity
Seasonal
Efciency
PIDN-PIDL
Net
Ratings
Boiler
water
content
Chimney
and
breeching
size
(Note 1)
Input
(Btuh)
Output
(Btuh)
Input
(Btuh)
Output
(Btuh)
Btuh
(Note 2)
AFUE %
Btuh
(Note 3)
(gallons)
Inches
CGa-25 38,000 32,000 34,000 29,000 32,000 84.0 27,000 1.5 4"I.D. x 20’
CGa-3 67,000 56,000 60,000 50,000 56,000 84.0 48,000 1.5 4”I.D. x 20’
CGa-4 100,000 84,000 90,000 76,000 85,000 84.0 73,000 2.1 5”I.D. x 20’
CGa-5 133,000 112,000 120,000 101,000 113,000 84.0 98,000 2.7 6”I.D. x 20’
CGa-6 166,000 139,000 149,000 125,000 141,000 84.0 122,000 3.3 6”I.D. x 20’
CGa-7 200,000 168,000 180,000 151,000 170,000 84.0 147,000 3.8 7”I.D. x 20’
CGa-8 233,000 196,000 210,000 176,000 198,000 84.0 172,000 4.4 7”I.D. x 20’
Notes
1. Add “PIN” for natural gas boiler - “PIL” for Liqueed Petroleum (propane) gas boiler.
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 sufcient 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.
Part Number 550-142-300/0520
65
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
Ratings13b
Install CGa 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.
CGa boilers are CSA design certified for installation on combustible flooring.
CGa boilers are ASME rated for 50 psig working pressure.
Table 8 Ignition system model suffixes
Pilot ignition system Natural gas Propane gas
Spark-ignite pilot PIDN PIDL
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