Burnham `A `B `C `D `E Users Manual CHG Literature

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Defining the Best in Home Heating

Condensing
High Efficiency
Gas Water Boiler
Natural or LP Gas
Water Only Boiler
94+% AFUE
ENERGY STAR® Certified

Cast Aluminum Heat Engine
Direct Vent Sealed Combustion
150 - 225 MBH (2 sizes)
Fully Modulating Firing Rates
Low NOx and CO Ratings

Defining the Best in Home Heating
Here at Burnham we are passionate about our products and want to help insure your family’s comfort with the
security of the Burnham Hydronics name. When you select Burnham, you’re buying more than just an appliance.
Every product is crafted with the highest quality materials and components – by experts committed to delivering
the absolute best performance. With Burnham products, you can count on the best craftsmanship, ingenuity, and
customer service and support that the industry has to offer.

CHG “Condensing, High Efficiency, Gas” Boilers
Today’s lifestyles have created ever increasing demands for abundant supplies of comfortable space heating including radiant
heat, domestic hot water, and snow melting to keep walks and driveways clear – all with the best possible efficiencies available.
A condensing boiler can help ensure that all of these needs are met.
Burnham now offers the best solution for these demanding needs with a ruggedly designed, cast aluminum, condensing boiler
that has efficiency ratings exceeding 94+%. The CHG boiler will meet your family’s heating needs and save you money in energy
operating costs.

94+% Efficiency

What is a “condensing” boiler?
Burnham CHG condensing boilers
achieve 94+% efficiency through
our uniquely designed heat engines.
These sectional, cast aluminum
designs use the heat in the exhaust
gases from the boiler’s combustion
process to preheat the water as it
enters the boiler, thus capturing
energy that otherwise would be lost.

When a condensing boiler is working at its peak efficiency,
the water vapor produced in the gas combustion process
condenses back into water – hence the name “condensing” boiler. This condensation of exhaust gases releases
the latent heat that is given off when water is vaporized.
Together these two processes, condensation and vaporization, create the high efficiencies associated with Burnham’s
CHG condensing boilers.

Full Modulating Operation

The “Quiet” Boiler

Our CHG boilers are designed to automatically adjust the
firing rate to match your home’s heating needs. With up
to a 5-to-1 turn down ratio, a CHG boiler will continuously
adjust its output to more efficiently and effectively provide
the right amount of heat which further helps conserve fuel
and reduce heating costs.

Through its state-of-the-art design, packaging, and unique
combustion process, a CHG boiler operates so quietly
that you may not even “hear” it firing, but you can see its
operating sequence with a digital display mounted on the
top of the boiler.

Potential Annual Fuel Savings
by Increasing Efficiency
Example Savings for:
150,000 Btu Boiler
Gas price at $12.00/Mcf
NOTE - When determining potential savings, all of
these factors must be considered: (1) increased efficiency
rating over previous equipment , (2) new boiler BTU rating,
(3) cost of fuel, and (4) hours per day of full operation.

15-Year Limited Warranty
The aluminum heat engine in our CHG boilers is covered
by a 15-year limited factory warranty. The purchase of an
optional Burnham’s Winter Warmth Assurance program
for your CHG boiler can extend our True Blue Warranty
protection to include parts and labor for the entire boiler
for either 5 or 10 years.

Safety with Increased Efficiency
CHG boilers use a sealed combustion system that isolates
the combustion process in the boiler from the air inside
your home. This design helps save energy dollars by using
outside air, rather than room air you’ve already paid to
heat, and assures that exhaust gases go directly outside.
In addition, the CHG boilers are designed to keep your
heating system running efficiently with Annual Fuel Utilization Efficiencies (AFUE) of 94+% which can save you
hundreds of dollars on your annual heating bill.

CHG Site Glass & Burner
The flame can be continuously
modulated from an orange
glow to a full blue flame.
The burner is located on the
top of the heat engine forcing
the heat down while the water
flows upward. This allows the
condensation to drain down
and away from the boiler.

Cutaway view showing
actual water flow path.

Boiler Operations
The CHG castings incorporate a multi-pass water
flow with the return water entering the lower
manifold and progressing upward to the supply manifold. This counterflow from bottom to
top provides for maximum heat transfer while
the serpentine pattern offers low pressure drop.
Each section’s water flow is independent with no
port connections between sections. The supply
and return manifolds are designed to balance
the flow across all sections.

Supply
Manifold

Return
Manifold

Negative regulated gas valve
with factory set outlet pressure.

Premix Technology
CHG boilers utilize a pre-mix combustion assembly that includes a modulating gas valve, variable speed blower and a venturi to provide an
optimal fuel/air mixture to a stainless steel mesh
Venturi
burner. Together these components accurately
Variable and efficiently help control the fully modulating
combustion process which automatically adjusts
Speed
Blower the boiler’s firing rate to match your heating
needs.

Boiler Control Module & Outdoor Reset
The MCBA microprocessor control manages all
boiler functions including supervising the combustion process and monitoring key operating
functions. Included is a digital display that can
provide detailed boiler information as well as be
an invaluable service and troubleshooting tool.
The MCBA module stores set points for boiler
and domestic hot water supply temperatures,
and monitors supply and return water temperatures, flue gas temperature, the flame sensor,
and the included outdoor reset. The boiler control module allows for continuous modulation
(firing rates) by varying the combustion fan
speed.

Domestic Hot Water
Abundant domestic hot water
is available with a matching
Alliance indirect-fired hot
water heater. Select from
several sizes to meet your
specific needs. In addition, the
CHG boiler control module
is preset for domestic hot
water priority and set point
temperature.

CHG Venting
Boiler
Model

Horizontal Vertical
Vent
Vent Max. Vent Max. Diameter

CHG150

55 ft.

49.5 ft.

3 in.

CHG225

55 ft.

47 ft.

4 in.

The CHG incorporates a sealed combustion
system that uses outside air for combustion and
the safe and proven AL29-4C stainless steel material for venting the exhaust. Both horizontal
(“sidewall”) and vertical (“through-the-roof”)
venting options are available.

RATINGS
Boiler
Model

Maximum Input
(MBH)

Minimum Input
(MBH)

DOE
Heating Capacity
(MBH)

I=B=R
Net Rating
(MBH)

AFUE %

CHG150
CHG225

150,000
225,000

30,000
56,250

135,000
202,000

117,000
176,000

93.10
94.20

SPECIFICATIONS
Horizontal Venting

Vertical Venting

Boiler
Model

Vent
Diameter
(inches)

Air Inlet
Diameter
(inches)

Maximum
Vent
Length
(Equiv. Ft.)

Maximum
Air Inlet
Length
(Equiv. Ft.)

Maximum
Vent
Length
(Equiv. Ft.)

Maximum
Air Inlet
Length
(Equiv. Ft.)

Water
Volume
(gal.)

Approx.
Shipping
Weight
(lbs.)

CHG150
CHG225

3
4

4
4

55
55

60
60

49.5
47

52
52

1.3
1.1

258
323

B

DIMENSIONS

D

Boiler
Model

‘A’

‘B’

‘C’

‘D’

‘E’

CHG150
CHG225

23-3/8
27

18-3/4
22-3/8

8-1/8
8-1/4

13
7-1/8

3-1/2
3

E

C
22-1/4

* All dimensions in inches
A
LWCO

Top View

Temperature/
Pressure
Gauge

4" Air
Inlet Collar

Gas
Connection

Relief
Valve
1-1/4 Supply

F

Vent
Adapter

G

H

Low Voltage
Connections

Alternate Gas
Connection

Line Voltage
Connections

43-3/4

1-1/4 Return

Alternate
1-1/4 Return
Alternate
Condensate Drain
Connection

Back View

Right View

Front View

STANDARD EQUIPMENT
Deluxe Insulated Jacket
Circulator - Shipped Loose
Pressure Temperature Gauge
Drain Valve
MCBA Microprocessor Control
w/ Outdoor Reset (standard)

Form No. PL81401311000-6/06-10MS

Condensate Drain
Connection

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

© 2006 U.S. Boiler Company, Inc. - Lancaster, PA
Phone: 1-888-432-8887
www.burnham.com

Printed in the U.S.A.



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