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Part Number 550-110-711/1108
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CGi-4E Gas-Fired Water Boiler — Boiler Manual
Ratings
Table 10 Boiler ratings
13b
CGi-4Eboilersforresidentialradiantpanelsystems,convertedgravityheatingsystemsorotherlowwater
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,contactyourWeil-McLainsalesofce.CSAdesigncertiedforinstallationoncombustibleooring.
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-4E
(Note 5)
76,000 90,000 76,000 81,000 68,400 66,000 2.1 85.0 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. CGi-4E 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.
5. As an Energy Star Partner, Weil-McLain has determined that the CGi-4E meets the Energy Star guidelines for
energy efficiency.
DOE
(Note5)