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Boiler
Model
Vent
Diameter
(inches)
Air Inlet
Diameter
(inches)
Horizontal Venting Vertical Venting
Water
Volume
(gal.)
Approx.
Shipping
Weight
(lbs.)
Maximum
Vent
Length
(Equiv. Ft.)
Maximum
Air Inlet
Length
(Equiv. Ft.)
Maximum
Vent
Length
(Equiv. Ft.)
Maximum
Air Inlet
Length
(Equiv. Ft.)
CHG150 3 4 55 60 49.5 52 1.3 258
CHG225 4 4 55 60 47 52 1.1 323
Boiler
Model
Maximum Input
(MBH)
Minimum Input
(MBH)
DOE
Heating Capacity
(MBH)
I=B=R
Net Rating
(MBH) AFUE %
CHG150 150,000 30,000 135,000 117,000 93.10
CHG225 225,000 56,250 202,000 176,000 94.20
Back View
1-1/4 Return
Ga
s
Connection
Condensate Drain
Connection
Front View
F
Vent
Adapter
4" Air
Inlet Collar
LWCO
43-3/4
Top View
22-1/4
C
B
E
D
A
HG
Right View
Temperature/
Pressure
Gauge
Relief
Valv
e
1-1/4 Supply
Alternate
1-1/4 Return
Line Voltage
Connections
Low Voltage
Connections
Alternate
Condensate Drain
Connection
Alternate Ga
s
Connection
RATINGS
SPECIFICATIONS
DIMENSIONS
© 2006 U.S. Boiler Company, Inc. - Lancaster, PA
Phone: 1-888-432-8887
www.burnham.comForm No. PL81401311000-6/06-10MS Printed in the U.S.A.
STANDARD EQUIPMENT
Deluxe Insulated Jacket
Circulator - Shipped Loose
Pressure Temperature Gauge
Drain Valve
MCBA Microprocessor Control
w/ Outdoor Reset (standard)
Digital Touchpad Display Panel
Variable Speed Combustion Blower
Negative Regulation Gas Valve
Venturi
Stainless Steel Mesh Burner
Supply Water Temperature Sensor
Return Water Temperature Sensor
Flue Gas Temperature Sensor
Flame Sensor
Differential Pressure Switch
High Limit
LWCO and Transformer
Condensate Trap
Air Inlet Screen
Safety Relief Valve
Boiler
Model ‘A’ ‘B’ ‘C’ ‘D’ ‘E’
CHG150 23-3/8 18-3/4 8-1/8 13 3-1/2
CHG225 27 22-3/8 8-1/4 7-1/8 3
* All dimensions in inches