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Part number 550-110-260/0508
63
GOLD CGs Gas-Fired Water Boiler — Boiler Manual
Ratings
Table 7 Boiler ratings
DOE
13b
(Note 5)
CGs 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 fl ue gas condensation due to lower operating water temperatures. For alternate piping,
contact your Weil-McLain sales offi ce. CSA design certifi ed for installation on combustible fl ooring. Tested for
50 psi working pressure.
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 11 2, 0 0 0 133,000 112,400 119,000 100,600 97, 0 0 0 2.7 84.0 3"
CGs-6 140,000 167,000 140,300 150,300 126,300 122,000 3.3 83.4 3"
Notes
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 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.