Oil-Fired, High Efficiency, 3-Pass
Water Boilers
• High Efficiency 87% AFUE
• 3-pass Cast Iron
Sectional Design
• Natural Draft Oil Boiler
- Five Sizes Available, 0.60-1.65 gallons
• Direct Vent Option Kit
- Three Sizes Available, 1.05-1.65 gallons
• Easy Installation and Servicing
with Reversible Swing Door
and no Target Wall or
Blanket Required
• Multiple Burner Options
Oil-Fired, High Efficiency,
3-Pass Water Boilers
Burnham’s MPO Boiler
Unique 3-Pass Cast Iron Design
The MPO boiler has been exclusively designed by Burnham engineers to
use a 3-pass cast iron sectional design that is unequaled in the industry.
MPO sections are produced in Burnham’s own state-of-the-art foundry
in Zanesville, Ohio, and are the primary reason why the MPO is able to
attain an ENERGY STAR-certified 87% AFUE.
Built-in Return Water Boiler Protection
Every MPO boiler comes equipped with a unique return
water blending device that automatically mixes hot boiler
water with cool return water. This device also aids in
keeping temperatures consistent within the boiler which
provides greater operational efficiencies and allow the
boiler to operate with virtually any type of hot water
system.
Easy to Install, Maintain, and Service
From installation to service, the MPO has been designed with the contractor in mind.
Installation features include a plug-and-play wiring junction box with easy plug-in
control and accessory connections, and a reversible swing-away door with an easy
connect power cord for the burner. The MPO includes a Honeywell electronic high-limit
aquastat and provisions for optional plug-in accessories, such as a low water cutoff
or an additional high-limit. For maintenance and servicing, the MPO comes equipped
with reversible stainless steel flueway baffles, rear cleanout access plates, and ample
flueway clearance for easy cleaning.
Multiple Burner Options
Burnham offers the flexibility of multiple burner choices for the MPO boiler. A selection
of burners from industry-leading manufacturers is available for all MPO sizes*.
MPO Direct Vent Kit
No chimney? The MPO-DV (Direct Vent) Option Kit is the perfect
solution! The venting kit includes a stainless steel sidewall
concentric vent/air intake termination. To connect the boiler flue
connects to this piece, a flexible stainless steel, double wall,
insulated pipe is also available in 5, 10, 15, and 20 foot lengths.
Intake air for combustion connects directly from the burner housing to the vent terminal
with a 4” galvanized single wall pipe.
Additional Venting Options
MPO-DV Option Kit’s flexible stainless steel pipe permits
installation in just about every application where a chimney
is not available. For added convenience in installations where
there is little clearance behind the boiler, optional stainless steel
“starter tees” are now available. These tees fit directly to the rear
of the boiler and allow for the pipe to be connected vertically.
This dramatically reduces the footprint of the boiler installation,
by allowing the MPO to be installed close to a wall. Featuring
welded stainless steel construction, the tees are equipped with a convenient, handleoperated, removable bottom cleanout plate.
* Direct Vent boilers require the use of dedicated direct-vent compatible burners, such as the Beckett
NX. Additional burners may be available, please contact your Burnham supplier for details.
Honeywell Aquastat
The standard Honeywell L7248
electronic aquastat, includes digital
display and interface capability to
provide diagnostic information.
3” Insulation
Surrounds boiler
block which reduces
heat loss through the
boiler jacket.
Plug-In Connectors,
Concealed Wiring
Harness
Provides easy hook-up
of additional controls,
Wiring harness is
hidden beneath the
jacket, providing a clean
appearance.
3-Pass Cast Iron
Heat Exchanger
Flue gases are
recirculated through
the heat exchanger,
extracting the
maximum BTUs
possible from the
combustion process.
Removable Flueway
Baffles
Allow the MPO to be
installed in a variety of
chimney applications and
permit easy cleaning
Reversible
Swing-Away
Burner Door
Offers easy access
to combustion
chamber for
cleaning.
Large, Geometric
Combustion
Chamber
Without a target
wall or blanket,
increases heat
transfer and reduces
costs on repair
parts.
Integrated
Boiler Door
Support
Holds weight of
boiler swing door
in closed position,
reducing stress &
wear on hinges.
Burnham
Alliance SL™
Indirect-fired Water Heaters
The Alliance SL water heaters are designed with
an effective hydrastone lining that offers superior
corrosion resistance and outstanding performance in a wide
variety of water conditions.
Water heaters are available in five sizes from 27-119 gallons,
and come with a unique 10/2/1 warranty – 10 years on the
tank and coil, 2 years labor and 1 year on parts.
Ratings
FRONT SERVICE
CLEARA NCE
(FLUEWAY C LEANING)
‘C’ D IA.
COLLAR
‘B’ M IN.
TOP V IEW FRONT VIEW SIDE VIEW BACK VIEW
‘A’
5
8
22
“
33”
3
8
21
“
Optional
Stainless Steel
DV Starter “T”
‘D’
Model
Number Burner Capacity (GPH)
Heating Capacity (MBH)
DOE
I=B=R
Water Ratings AFUE%
MPO84 .60 74 64 87
MPO115 .80 98 85 87
MPO147 1.05 129 112 87
MPO189 1.35 167 145 87
MPO231 1.65 203 177 87
Specifications
Dimensions (inches)
Model
Number
Water
Content (gal.)
MPO84 16-5/8 24 5 7.70 475 N/A
MPO115 16-5/8 24 5 7.70 475 N/A
MPO147 22-5/8 24 6 11.08 567 579
MPO189 28-5/8 30 6 14.46 659 692
MPO231 34-5/8 30 7 17.84 751 807
Natural Vent
Approximate
Shipping Weight (lbs.)
MPO Direct Vent Kit
Direct Vent
Approximate
Shipping Weight (lbs.)‘A’ ‘B’ ‘C’
Model
Number
Vent Connector
Diameter (inches)
Optional Starter “T”
Depth ‘D’ (Inches)
MPO147 5 14
MPO189 5 14.5
MPO231 6 14.5
© 2008 U.S. Boiler Company, Inc. - Lancaster, PA
Form No. PL81401301000-9/08-10M
Phone: 1-888-432-8887
www.burnham.com Printed in the U.S.A.
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