Product Overview

Notes:
() Add “PIN” for natural gas, “PIL” for propane.
() Based on standard test procedures prescribed by the United States Department of Energy.
() Net AHRI ratings are based on net installed radiation of sucent quantity for the requirements of the building and
nothing needs to be added for normal piping and pick-up. Ratings are based on a piping and pick-up allowance of 115. An
additional allowance should be made for unusual piping and pick-up loads.
() Refer to National Fuel Gas Code, ANSI Z223.1-latest edition for chimney sizing and vent connector lengths.
CGi boilers are C.S.A. design certified for installation on combustible flooring. Tested for 50 psi working pressure.
STANDARD EQUIPMENT:VENTING OPTIONS
DIMENSIONS
ADDITIONAL EQUIPMENT:
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Factory Tested
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Two-Piece, Top Jacket Panel
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Insulated Extended Steel
Jacket
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Cast Iron Sections with Built-in
Air Separator
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Radiation Plates
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Steel Base
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Integrated Boiler Control
Module with Intermittent
Electronic Ignition System &
Indicator/Diagnostic Lights
■
Inducer Assembly
(with cover— sizes 25-5)
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Flue Gas Collector/Transition
Assembly
■
Combination Gas Valve for 24
Volt
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Wiring Harness
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Air Pressure Switch
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Non-Linting Pilot Burner
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High-Grade Stainless Steel
Burners
■
40VA Transformer
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Electrical Junction Box
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Rollout Thermal Fuse Element
■
High-Limit Temperature
Control
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Circulator (when ordered)
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30 PSI ASME Relief Valve
(boiler sections tested for 50
PSI working pressure)
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Combination Pressure-
Temperature Guage
■
Drain Valve
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CGi AL29-4C® Starter
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Taco 007 Circulator
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Outdoor Reset Kit
(part #381-356-586) Low
cost, simple plug-in sensor—
check local utility program for
possible rebate.
■
Zone Interface Harness Kit
(part #381-356-585) Used
to communicate between
an existing relay panel wired
into the system and boiler, to
separate DHW from space
heating demands.
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Expansion Tank Package
(expansion tank, fill & check
valve, auto air vent and
fittings): #109-sizes 3 thru 5;
#110-sizes 6 thru 8. Shipped in
separate carton.
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High Altitude Kits
■
W-M 5 & 10 Year Homeowner
Protection Plan
WM1702_BRO_033 CGi
Front
Direct Exhaust VentingNatural Draft Venting
Note: Boiler circulator is shipped loose. Circulator may be mounted on either
boiler supply or return piping. See dimension chart for pipe size of circulator
flange provided.
CGi-25 10 ¾ ¾ ½
CGi-3 10 1 1 ½
CGi-4 13 1 1 ½
CGi-5 16 1 1 ½
CGi-6 19 1¼ 1¼ ½
CGi-7 22 1¼ 1¼ ¾
CGi-8 25 1½ 1½ ¾
CGi-25 50 42 37 84.0 200 1.5 4" I.D.
CGi-3 60 51 45 85.1 200 1.5 4" I.D.
CGi-4 90 76 66 85.0 245 2.1 5" I.D.
CGi-5 119 100 87 83.3 290 2.7 5" I.D.
CGi-6 167 140 122 83.3 335 3.3 5" I.D.
CGi-7 200 167 145 83.0 390 3.8 5" I.D.
CGi-8 233 194 169 82.7 420 4.4 5" I.D.
Model
Model (1)
Dimensions
inches W
CSA Input
MBH (2)
Supply Piping
in. (1)
Return Piping
in. (1)
Nat or LP Gas
Connection
Size inches
DOE Seasonal
Eciency
Percent (AFUE)
Approx.
Shipping
Weight (Lbs)
Boiler Water
Content (Gal.)
Minimum Vent
Connector
Diameter (4)
Notes: (1) Circulator flange supplied with boiler is the same size as recommended pipe size. For supply and return boiler
tapping size, see installation manual.
DOE Heating
Capacity
MBH (2)
Net AHRI
Water Ratings
MBH (3)
In the interest of continual improvements in product and
performance, Weil-McLain reserves the right to change
specifications without notice.
Left Side Right Side Top View
RATINGS
CGi Boiler Brochure.indd 2 2/8/2017 9:14:09 AM