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

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Defining the Best in Home Heating

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

Condensing

High Efficiency

Gas Water 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.

CHG “Condensing, High Efficiency, Gas” Boilers

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.

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.

Defining the Best in Home Heating

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

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 “condens-

ing” boiler. This condensation of exhaust gases releases

the latent heat that is given off when water is vaporized.

Together these two processes, condensation and vaporiza-

tion, create the high efficiencies associated with Burnham’s

CHG condensing boilers.

What is a “condensing” 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.

Full Modulating Operation

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.

The “Quiet” Boiler

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 Uti-

lization Efficiencies (AFUE) of 94+% which can save you

hundreds of dollars on your annual heating bill.

Safety with Increased Efficiency

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.

15-Year Limited Warranty

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.

CHG Site Glass & Burner

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.

Domestic Hot Water

CHG boilers utilize a pre-mix combustion assem-

bly that includes a modulating gas valve, vari-

able speed blower and a venturi to provide an

optimal fuel/air mixture to a stainless steel mesh

burner. Together these components accurately

and efficiently help control the fully modulating

combustion process which automatically adjusts

the boiler’s firing rate to match your heating

needs.

Premix Technology

Negative regulated gas valve

with factory set outlet pressure.

Venturi

Variable

Speed

Blower

The CHG incorporates a sealed combustion

system that uses outside air for combustion and

the safe and proven AL29-4C stainless steel ma-

terial for venting the exhaust. Both horizontal

(“sidewall”) and vertical (“through-the-roof”)

venting options are available.

CHG Venting

Boiler

Model

Horizontal

Vent Max.

Vertical

Vent Max.

Vent

Diameter

CHG150 55 ft. 49.5 ft. 3 in.

CHG225 55 ft. 47 ft. 4 in.

The MCBA microprocessor control manages all

boiler functions including supervising the com-

bustion 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 tempera-

tures, flue gas temperature, the flame sensor,

and the included outdoor reset. The boiler con-

trol module allows for continuous modulation

(firing rates) by varying the combustion fan

speed.

Boiler Control Module & Outdoor Reset

Supply

Manifold

Return

Manifold

The CHG castings incorporate a multi-pass water

flow with the return water entering the lower

manifold and progressing upward to the sup-

ply 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.

Boiler Operations

Cutaway view showing

actual water flow path.

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

Gas

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

Valve

1-1/4 Supply

Alternate

1-1/4 Return

Line Voltage

Connections

Low Voltage

Connections

Alternate

Condensate Drain

Connection

Alternate Gas

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