CGt boilers for residential radiant panel systems, converted gravity heating systems or other low water tempera-
ture applications should be installed with balancing valves and bypass piping equal to the supply and return
size to avoid excessive flue gas condensation due to lower operating water temperatures. For alternate piping,
contact your Weil-McLain sales office.
CSA design certified for installation on combustible flooring.
Tested for 50 psi working pressure.
67
Part Number
550-110-290/0219
CGt
GAS-FIRED WATER BOILER — Series 2 —
Boiler Manual
15
AHRI Certified Ratings
Boiler
model
number
Input
Output
Heating
Capacity
Seasonal
Efficiency
Net
Ratings
(water)
Boiler
water
content
Vent size
Direct
exhaust
Chimney
draft
Btuh
Btuh
Btuh
(Note 1)
AFUE %
Btuh
(Note 2)
(gallons)
(Note 3)
CGt-PIN
133,000
109,000
109,000
82.1
95,000
3.1
3”
5”
Notes
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 build-
ing 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. Direct exhaust CGt boilers require special venting, consistent with Category III boilers. Use only the vent
materials and methods specified in this manual. Chimney draft vented CGt boilers may use type B vent or
other materials suitable for venting Category I boilers.
Table 9
Boiler ratings
Ratings