Filter
Top Products
Part Number 550-110-710/0107
67
GOLD CGi Gas-Fired Water Boiler — Boiler Manual
Ratings
Table 10 Boiler ratings
DOE
13b
CGi 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.
Boiler
model
number
DOE
Heating
capacity
(Btuh)
0–2,000 feet
altitude
2,000–4,500 feet
altitude
Net
I=B=R
ratings
(Btuh)
Boiler
water
content
(gallons)
DOE
Seasonal
efficiency
(% A.F.U.E)
Vent
size
Input
(Btuh)
Output
(Btuh)
Input
(Btuh)
Output
(Btuh)
(Note 1) (Note 2) (Note 3)
(Note 4)
CGi-25 42,000 50,000 42,000 45,000 38,000 37,000 1.5 84.0 3"
CGi-3 51,000 60,300 51,000 54,300 46,200 45,000 1.5 85.1 3"
CGi-4 85,000 100,000 85,000 90,000 76,000 74,000 2.1 84.0 3"
CGi-5 100,000 119,700 100,000 108,000 90,000 87,000 2.7 83.3 3"
CGi-6 140,000 167,000 140,000 150,000 126,000 122,000 3.3 83.3 3"
CGi-7 167,000 200,000 167,000 180,000 150,000 145,000 3.8 83.0 3"
CGi-8 194,000 233,000 194,000 210,000 175,000 169,000 4.4 82.7 3"
1. Add “PIN” for natural gas boiler - “PIL” for propane gas boiler.
Notes
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. CGi boilers require special venting, consistent with Category I or III boiler. Use only the vent materials and
methods specified in this manual. Vent diameter shown above is for direct exhaust venting. See Table 3,
page 14, for vent diameter when chimney draft venting.