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Part number 550-110-260/0200
59
Boiler Manual
Ratings
Table 7 Boiler ratings
DOE
1. Add “PIN” for natural gas boiler - “PIL” for propane gas
boiler.
2. Based on standard test procedures prescribed by the
United States Department of Energy.
3. Net I=B=R 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
Notes
13b
CGs boilers for residential radiant panel systems, converted gravity heating systems or other low water temperature
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.
made for unusual piping and pickup loads.
4. CGs boilers require special venting, consistent with
Category III or IV boiler. Use only the vent materials and
methods specified in CGs vent supplements. CGs boilers
may be direct-vented (using 3" diameter air piping) as
specified in the direct vent supplements.
5. As an Energy Star Partner, Weil-McLain has determined
that the CGs-3 meets the Energy Star guidelines for energy
efficiency.
(Note 5)
Boiler
model
number
DOE
Heating
capacity
(Btuh)
0-2,000 feet 2,000-4,500 feet Net
I=B=R
ratings
(Btuh)
Boiler
water
content
(gallons)
DOE
Seasonal
efficiency
(% AFUE)
Vent
size
Input
(Btuh)
Output
(Btuh)
Input
(Btuh)
Output
(Btuh)
(Note 1) (Note 2) (Note 3) (Note 5) (Note 4)
CGs-3
(Note 5)
57,000 67,000 57,300 60,300 51,600 50,000 1.5 85.3 3"
CGs-4 85,000 100,000 85,000 90,000 76,500 74,000 2.1 84.6 3"
CGs-5 112,000 133,000 112,400 119,000 100,600 97,000 2.7 84.0 3"
CGs-6 140,000 167,000 140,300 150,300 126,300 122,000 3.3 83.4 3"