Gas and Oil-Fired Water and
Gas Fired Steam Boilers
BS
BW
MODEL BW1, BW2
MODEL BW3
Series B
Series B
MODEL BS1, BS2
Series B
MODEL BW9
Series A
MODEL BW4B, BW5B
Series B
Form No. PDS BS1A.75.3
BOILER ACCESSORIES (CONT.)
Combustible Floor Base (6 thru 7 section models)
KBASB0401DNK
KBANP0301DNK
KBANP0401DNK
KBANP0501DNK
KBANP0601DNK
KBANP0701DNK
KBANP0801DNK
KBANP0901DNK
Gas Conversion Kit Natural to Propane (3 section, BS1/2-075)
Gas Conversion Kit Natural to Propane (4 section, BS1/2-112)
Gas Conversion Kit Natural to Propane (5 section, BS1/2-150)
Gas Conversion Kit Natural to Propane (6 section, BS1/2-187)
Gas Conversion Kit Natural to Propane (7 section, BS1/2-225)
Gas Conversion Kit Natural to Propane (8 section, BS1/2-262)
Gas Conversion Kit Natural to Propane (9 section, BS1/2-299)
NOTE: There was never a Natural to Propane conversion kit for BW/BS boilers prior to 1799V.
BW4/BW5
DESCRIPTION
PART NO.
Filtrol Package (Includes Air Purge Extrol Tank and Fill Valve)
KBAFP0201DNK
KBAFP0301DNK
KBAZV0101DNK
KBAZV0201DNK
KBAHL0101DNK
KBATH0101IDNK
KBASB0301DNK
KBALF0101DNK
KBALF0201DNK
Zone Valve - 3/4 in.
Zone Valve - 1 in.
High-Limit Control - Manual Reset*
Tankless Water Heater Kit
Combustible Floor Base
Low Fire Rate Kit - 3 Section BW4/BW5
Low Fire Rate Kit - 4 Section BW4/BW5
BW9
DESCRIPTION
PART NO.
Concentric Vent Termination Kit (Single Pipe) - 2 in.
Concentric Vent Termination Kit (Single Pipe) - 3 in.
Filtrol Package (Up to 75,000 Btuh Input)
Filtrol Package (Up to 150,000 Btuh Input)
Zoning Valve 3/4 in.
KGAVT0501CVT
KGAVT0601CVT
KBAFP0101DNK
KBAFP0201DNK
KBAZV0101DNK
KBAZV0201DNK
KBANP1101DNK
KBANP1201DNK
KBANP1301DNK
KBAPN1101DNK
KBAPN1201DNK
KBAPN1301DNK
Zoning Valve 1 in.
Gas Conversion Kit Natural to Propane (BW9-050)
Gas Conversion Kit Natural to Propane (BW9-075)
Gas Conversion Kit Natural to Propane (BW9-100)
Gas Conversion Kit Propane to Natural (BW9-050)
Gas Conversion Kit Propane to Natural (BW9-075)
Gas Conversion Kit Propane to Natural (BW9-100)
* 2–6 Section Models on BS1, BS2, BW1, and BW2; 2–5 Section Models on BW3.
† 7–9 Section Models on BS1, BS2, BW1, and BW2; 6–7 Section Models on BW3.
Note: Accessory High Limit Control is a strap-on aquastat used as an auxiliary limit or reverse acting circulator control.
—3—
CIRCULATOR CURVE
WATER FLOW M3/H
1
2
3
4
5
12
10
8
3
2
6
4
1
2
0
4
8
12
16
20
24
WATER FLOW GPM
WATER BOILER CIRCULATOR CURVE
ELECTRICAL DATA
ALL MODELS
Voltage—Hertz—Phase
115 — 60 — 1
Minimum Branch Circuit Wire Size (AWG)
Maximum Fuse Size (Amps)
Control Circuit Power Available
14
15
40va–@ 24v
STANDARD BOILER WARRANTIES (Yrs)
MODEL
BW1
3
BW2
3
BW3
3
BW4
3
BW5
3
BW9
3
BS1
—
BS2
—
Circulator Pump
Vent Damper
5
5
—
—
20
3
—
20
3
—
5
5
Heat Exchanger Section Assembly (Non-prorated)
Oil Burner
20
—
20
—
20
—
15
—
12
—
12
—
®
CERTIFIED
ama
®
ASME
—4—
MODELS BW9
The BW9 is a gas fired direct vent condensing hot water
The BW9, unlike normal residential atmospheric and induced draft
boilers, takes its combustion air directly from the outdoors (sealed
combustion) and does not compete with building occupants for
fresh air. Sealed combustion (also known as “direct vent”) is the
safest and best way to obtain plenty of clean combustion air. The
induced draft fan draws in the outside combustion air, then takes the
cooler flue gases from the heat exchanger and provides a positive
removal of the flue gases from the building through inexpensive and
readily available PVC and CPVC pipes.
boiler with cast aluminum heat exchanger sections. A
revolutionary cast aluminum heat exchanger means better
heat transfer and thermal storage than similarly sized cast
iron boiler, which results in higher efficiency. The heating
system water absorbs large amounts of heat from the cast
aluminum heat exchanger, cooling the flue gases and
causing condensation. Sealed combustion, premix gas
burner, and low flame temperature means drastically
reduced CO and NOx emissions, which contribute to a
cleaner and healthier environment.
FEATURES
RANGE OF CAPACITIES—Three sizes ranging from 50,000
through 100,000 Btuh input.
COMPLETELY PACKAGED—Each boiler is completely
assembled, including all controls (except room thermostat). All
necessary wiring is factory installed. The boiler is ready for gas
piping, room thermostat, and electrical power connections as
shipped. Circulator is shipped pre-wired with 6 ft bx conduit for
easy installation for supply side pumping.
VENTING—This boiler is direct vented with PVC and CPVC pipe.
See the Installation Instructions for common venting requirements.
ALUMINUM SECTIONS—These sections speed heat transfer to
the boiler water. With faster thermal response, greater comfort and
economy are achieved.
PRE-MIX BURNER—Provides quiet operation and improved
combustion efficiency.
CONTROLS—Integrated Boiler Control provides safe,
dependable operation of burners. Factory-installed safety
components provide maximum safety against overheating,
pressure buildup, and low-water operation.
SECTIONS TESTED—Each section is hydrostatically tested to
50 psig. Individual sections are tested to 125 psig at factory.
Assembled sections are tested to 75 psig at the factory. The
maximum allowable pressure is 50 psig for hot water boilers.
PROPANE CONVERTIBLE—With factory approved conversion
kit accessory.
WARRANTY—The aluminum sections are covered by a limited
15-year warranty on the entire assembly. Circulator pump is
covered by a limited 3-year warranty. All other parts are covered
by a 1-year limited warranty.
SPECIFICATIONS
UNIT SIZE
050
075
100
Sections
1
GAS CONTROLS
Gas Valve
Honeywell
Inlet Size
In.
1/2
Ignition
Hot Surface Ignition
Burner—Stainless/Titanium Alloy
1
#48
#44
Burner Orifice
No.
0.0615
CONTROLS
Limit Control Range
Pressure Relief Valve Setting
Integrated Boiler Control
CIRCULATOR
°F
100-200
30
Psig
UTEC factory installed
Taco
Model
In.
007
2.0 AMPS/330 WATTS
1-1/4
Full Load Amps
Flange Size FPT
—5—
DIMENSIONS
MODEL BW9
ALTERNATE OPENING
FOR GAS SUPPLY
BOILER WATER TEMPERATURE
ALTERNATE SUPPLY
& RETURN OPENINGS
& PRESSURE GAUGE
5" (127mm)
(1-1/4" NPT (31.75mm)
FRONT PANEL DOOR PULL
CONNECTIONS
PROVIDED INSIDE
BOILER CABINET)
VENT CONNECTION
(2" CPVC) (50.8mm)
DRAIN
ACCESS PANEL
CONDENSATE
LEVELING FEET
DRAIN FITTING
(1/2" PVC) (12.7mm)
OPENING FOR RELIEF VALVE
DISCHARGE PIPE
GAS SUPPLY
OPENING
(1/2" NPT) (12.7mm)
OPENING FOR AIR
VENT AND EXPANSION
TANK CONNECTION
JUNCTION BOX FOR 120 V POWER,
120 V CIRCULATOR BEADS, AND
24 V THERMOSTAT LEADS
VENT CONNECTION
(2" CPVC) (50.8mm)
ALTERNATE GAS
SUPPLY OPENING
COMBUSTION AIR
ALTERNATE BOILER WATER SUPPLY AND
INTAKE FITTING
RETURN
(31.75mm) CONNECTIONS
BOILER CABINET)
(2" PVC) (50.8mm)
ALTERNATE OPENING FOR
VENT TEE
(1-1/4" NPT
PROVIDED INSIDE
A99156
STANDARD BOILER WATER
SUPPLY & RETURN OPENINGS
(1-1/4" NPT (31.75mm) CONNECTIONS
PROVIDED INSIDE BOILER CABINET)
CLEARANCES
UNIT
COMBUSTIBLE (in.)
ACCESSIBILITY/CLEANING (in.)
SERVICING (in.)
TOP
1
1
8
1
0
1
0
1
8
8
LEFT SIDE
RIGHT SIDE
BASE
24
—
—
24
—
—
—
24
—
—
24
—
—
—
FRONT
BACK
INTAKE/VENT PIPING
NEAR BOILER HOT WATER PIPING
* Service clearance requirement 24-in.
RATINGS AND CAPACITIES*
BOILER
WATER
APPROX
SHIP.
GAS
MAX INPUT
(BTUH)
HEATING
NET RATING
CAPACITY
(GALLONS)
UNIT
TYPE
Natural
Natural
Natural
CAPACITY (BTUH)
AFUE %
Btuh†
WT (Lb)
BW9AAN050
BW9AAN075
BW9AAN100
50,000
75,000
45,000
90
90
90
39,000
59,000
78,000
2.6
2.6
2.6
220
220
220
68,000
100,000
90,000
* Gas input ratings are for elevations up to 2000 ft. In the USA, for elevations above 2000 ft., reduce input per the charts supplied in the high altitude derate kits.
In Canada, boilers may be used at high altitude by using a certified field conversion kit.
—6—
MODELS BS1 and BS2
Models BS1 and BS2 Gas-Fired Steam Boilers provide fast
heat quietly and economically to assure the finest in hydronic
heating.
These boilers provide quality design in a small, compact unit
easily installed in a basement, garage, or utility room. They
can be installed on a combustible floor when an optional
combustible floor base is used.
The model BS1 and BS2 design is CSA and A.G.A. certified
for use with natural and is convertible to propane gas with
accessory kit.
FEATURES
RANGE OF CAPACITIES—Sizes 75,000 through 299,000 Btuh
input are available.
COMPLETELY PACKAGED—Each boiler is completely assem-
bled, including all controls (except room thermostat). All necessary
wiring is factory installed. The boiler is ready for gas, water, room
thermostat, and electrical connections as shipped.
THERMAL-PIN, CAST-IRON SECTIONS—These sections speed
heat transfer from the flue gases to the boiler water, with faster ther-
mostat response, providing greater comfort and economy. Max-
imum heat is produced at a lower level on the thermal-pin sections,
leading to peak efficiency.
TITANIUM COMPOSITE BURNERS—Provide quiet operation,
corrosion resistance and improved combustion efficiency. Propane
convertible – with accessory kit.
CONTROLS—An automatic gas valve and continuous pilot or
intermittent pilot provide quiet, dependable operation of the
burners. Factory-installed safety components assure protection
against overheating, pressure buildup, and low-water operation.
INSULATED CASING—The casing is fully insulated with fiber-
glass for maximum operating efficiency and economy.
AUTOMATIC VENT DAMPER—The Model BS1 and BS2 is
designed with automatic vent damper to recover chimney loss
during off cycle.
SECTIONS TESTED—Each section is hydrostatically tested to
50 psig. Individual sections are tested to 125 psig at factory.
Assembled sections are tested to 75 psig at the factory.
Maximum allowable working pressure is 50 psig.
maximum allowable pressure is 15 psig for steam boilers.
The
INTERGRAL DRAFT—These boilers incorporate an integral draft
system to simplify installation. No external draft diverter is needed.
WARRANTY—The cast-iron sections are covered by a non-
prorated 12-year warranty on the entire assembly. Vent damper
covered by 5-year warranty. All other parts are covered by a 1-year
limited warranty.
SPECIFICATIONS
UNIT SIZE
075
112
150
187
225
262
299
GENERAL DATA
Sections—Fine Grain Cast Iron
Burners—Stainless/Titanium Alloy
Burners—Orifice Drill Size
GAS CONTROLS — STANDING PILOT (BS1)
Gas Valve
No.
No.
3
2
4
3
5
4
6
5
7
6
8
7
9
8
Natural
34
34
34
34
34
34
34
Honeywell
Honeywell
Honeywell
In.
Inlet Size
1/2 FPT
1/2 FPT
3/4 FPT
3/4 FPT
Pilot Assembly
GAS CONTROLS — INTERMITTENT PILOT (BS2)
Gas Valve
In.
Inlet Size
Pilot Assembly
Spark Generator
CONTROLS
Low-Water Cutoff
Honeywell
Honeywell/UTEC
McDonnell Miller
0—15
Pressuretrol
Psig
Setting
Capacity
Psig
Pressure Relief Valve
15 Psig
400 lb/hr
0–30
Pressure Retard Gage Range
Drain Cock
In.
3/4
Vent Damper*
In.
5
6
7
* Factory authorized and listed, field installed.
—7—
DIMENSIONS
MODELS BS1 and BS2
VENT
DAMPER
PRESSURE
GAGE
26 1⁄2″
4 3⁄4″
RELIEF
VALVE
2 1⁄2″
TRANSFORMER
GLASS
GAGE
PRESSURE
LIMIT CONTROL
WATER
LINE
2 1⁄2″ N.P.T.
LOW WATER
CUT-OFF
29″
LOW WATER
CUT-OFF PROBE
36 3⁄8″
2 1⁄2″
24″
S86
12 1⁄4″
GAS
VALVE
GAS LINE
A
LEFT SIDE
FRONT
RIGHT SIDE
DIMENSIONS (In.)
CLEARANCES (In.)
UNIT SIZE
A
VENT DIAMETER
RIGHT SIDE
LEFT SIDE
TOP
6*
6*
6*
6*
6*
075
112
150
187
225
262
299
11-1/4
14-1/2
17-3/4
21
5
6
6
7
7
7
7
BACK
FRONT
24-1/4
27-1/2
30-3/4
* Service clearance requirement 24 in.
RATINGS AND CAPACITIES*
NUMBER
MAX
HEATING
NET RATING
APPROX
SHIP.
GAS
OF
INPUT
(BTUH)
CAPACITY
(BTUH)
AFUE %
UNIT
TYPE
SECTIONS
Btuh
Sq Ft
196
283
383
479
571
671
767
196
283
383
479
575
671
767
(WITH DAMPER)
WT (Lb)
BS1AAN075
BS1AAN112
BS1AAN150
BS1AAN187
BS1AAN225
BS1AAN262
BS1AAN299
BS2AAN075
BS2AAN112
BS2AAN150
BS2AAN187
BS2AAN225
BS2AAN262
BS2AAN299
Natural
Natural
Natural
Natural
Natural
Natural
Natural
Natural
Natural
Natural
Natural
Natural
Natural
Natural
3
4
5
6
7
8
9
3
4
5
6
7
8
9
75,000
112,500
150,000
187,500
225,000
262,500
299,000
75,000
62,000
91,000
47,000
68,000
92,000
115,000
137,000
161,000
184,000
47,000
68,000
92,000
115,000
137,000
161,000
184,000
81.1
256
404
483
564
649
719
800
256
404
483
564
649
719
800
78.8
122,000
153,000
183,000
214,000
245,000
62,000
79.2
79.6
80.1
80.5
80.9
82.7
112,500
150,000
187,500
225,000
262,500
299,000
91,000
80.4
122,000
153,000
183,000
214,000
245,000
80.6
80.9
81.1
81.3
81.6
* Ratings are for altitudes to 2000 ft. Ratings for units for altitudes over 2000 ft are 4% less for each 1000 ft above sea level. Ratings in sq ft are computed at
240 Btuh/sq ft for steam boilers.
—8—
MODELS BW1 and BW2
Models BW1 and BW2 Gas-Fired Hot Water Boilers provide
fast heat quietly and economically to assure the finest in
hydronic heating.
These boilers provide quality design in a small, compact unit
easily installed in a basement, garage, or utility room. They
can be installed on a combustible floor when an optional
combustible floor base is used.
The models BW1 and BW2 design is CSA and A.G.A.
certified for use with natural and is convertible to propane gas
with accessory kit.
FEATURES
RANGE OF CAPACITIES—Sizes 37,500 through 280,000 Btuh are
available.
COMPLETELY PACKAGED—Each boiler is completely assembled,
including all controls (except room thermostat). All necessary wiring is
factory installed. The boiler is ready for gas, water, room thermostat,
and electrical connections as shipped.
THERMAL-PIN, CAST-IRON SECTIONS—These sections speed
heat transfer from the flue gases to the boiler water with faster
thermostat response, providing greater comfort and economy.
Maximum heat is produced at a lower level on the thermal-pin sections,
leading to peak efficiency.
INTEGRAL DRAFT—These boilers incorporate an integral draft sys-
tem to simplify installation. No external draft diverter is needed.
TITANIUM COMPOSITE BURNERS—Provide quiet operation,
corrosion resistance and improved combustion efficiency. Propane
convertible – with accessory kit.
CONTROLS—An automatic gas valve and continuous pilot or inter-
mittent pilot provide quiet, dependable operation of the burners.
Factory-installed safety components assure protection against
overheating, pressure buildup, and low-water operation.
INSULATED CASING—The casing is fully insulated with fiberglass for
maximum operating efficiency and economy.
AUTOMATIC VENT DAMPER—The Model BS1 and BS2 is
designed with automatic vent damper to recover chimney loss
during off cycle.
SECTIONS TESTED—Each section is hydrostatically tested to
50 psig. Individual sections are tested to 125 psig at factory.
Assembled sections are tested to 75 psig at the factory. The
maximum allowable pressure is 50 psig for hot water boilers.
WARRANTY—The cast-iron sections are covered by a non-prorated
20-year warranty on the entire assembly. Vent damper covered by 5-
year warranty. Circulator pump covered by 3-year warranty. All other
parts are covered by a 1-year limited warranty.
SPECIFICATIONS
UNIT SIZE
037
070
105
140
175
210
245
280
GENERAL DATA
Sections—Fine Grain Cast Iron
Burners—Stainless/Titanium Alloy
Burners—Orifice Drill Size
GAS CONTROLS — STANDING PILOT (BW1)
Gas Valve
No.
No.
2
1
3
2
4
3
5
4
6
5
7
6
8
7
9
8
Natural
34
34
34
34
34
34
34
34
Honeywell
In.
Inlet Size
1/2 FPT
1/2 FPT
3/4 FPT
3/4 FPT
Pilot Assembly
Honeywell
Honeywell
GAS CONTROLS — INTERMITTENT PILOT (BW2)
Gas Valve
In.
Inlet Size
Pilot Assembly
Spark Generator
CONTROLS
Honeywell
Honeywell/UTEC
Limit Control Range
°F
140–240
10–70
60–320
30
Pressure/Temperature Gage
Psig
°F
Pressure Relief Valve Setting
Circulator Relay—Aquastat
Vent Damper*
Psig
Honeywell (Factory Installed)
6
In.
Model
In.
4†
5
7
CIRCULATOR
Taco
007
0.70
1-1/4
Full Load Amps
Flange Size FPT
* Factory authorized and listed, field installed.
† A 4-in. vent damper is supplied. A 4-in. to 3-in. reducer is also furnished.
—9—
DIMENSIONS
BW1 and BW2 MODELS
VENT
DAMPER
TEMPERATURE/
1 1⁄4″ SUPPLY
ASME
RELIEF
VALVE
AQUASTAT
PRESSURE GAGE
26 1⁄2″
A
4 3⁄4″
8″
1 1⁄4″
1 1⁄4″ NPT
RETURN
SPILL
SWITCH
31 3⁄8″
23 1⁄4″
12 1⁄4″
5 3⁄8″
ROLLOUT
SWITCH
DRAIN VALVE
LEFT SIDE
INT. PILOT
CONTROL
GAS
VALVE
FRONT
RIGHT SIDE
DIMENSIONS (In.)
CLEARANCES (In.)
UNIT SIZE
037
A
VENT CONNECTION
6 (2-5 Section)*
RIGHT SIDE
LEFT SIDE
24 (6-9 Section)*
8
3
5
6
6
7
7
7
7
6 (2-5 Section)
24 (6-9 Section)
070
11-1/4
14-1/2
17-3/4
21
105
TOP
6
140
BACK
FRONT
6
175
6*
210
24-1/4
27-1/2
30-3/4
* Service clearance requirement 24 in.
245
280
RATINGS AND CAPACITIES*
NUMBER
MAX
INPUT
(BTUH)
HEATING
NET
APPROX
AFUE %
GAS
OF
CAPACITY
(BTUH)
RATING
(BTUH)
SHIP.
BW1, BW2
TYPE
Natural
Natural
Natural
Natural
Natural
Natural
Natural
Natural
SECTIONS
BW1
80.0
80.4
80.4
80.3
80.2
80.1
80.0
80.0
BW2
81.4
81.6
81.5
81.3
81.1
81.0
81.6
80.7
WT (Lb)
AAN037
AAN070
AAN105
AAN140
AAN175
AAN210
AAN245
AAN280
2
3
4
5
6
7
8
9
37,500
70,000
30,000
57,000
26,000
50,000
227
285
350
421
488
564
626
689
105,000
140,000
175,000
210,000
245,000
280,000
85,000
74,000
113,000
142,000
170,000
198,000
226,000
98,000
124,000
148,000
172,000
197,000
* Ratings are for altitudes to 2000 ft. Unit ratings for altitudes over 2000 ft are 4% less for each 1000 ft above sea level.
—10—
MODEL BW3
Model BW3 Gas-Fired Induced-Combustion Water Boilers
FEATURES
are the answer to energy-efficient residential hydronic
heating. They provide fast, almost instant, heat quietly and
economically.
These boilers provide quality design in a small, compact unit
easily installed in a basement, garage, or utility room. They
can be installed on a combustible floor when an optional
combustible floor kit is used.
The design of model BW3N is CSA and A.G.A. certified for
use with natural gas and is convertible to propane gas with
accessory kit.
RANGE OF CAPACITIES—Six sizes ranging from 42,500 through
225,000 Btuh input.
COMPLETELY PACKAGED—Each boiler is completely assembled,
including all controls (except room thermostat). All necessary wiring is
factory installed. The boiler is ready for gas, water, room thermostat,
and electrical power connections as shipped.
VENTING—This boiler can be vented into any approved chimney or
Type B-1 vent. Common-venting with an existing water heater is
acceptable in vertical vent systems. See the Installation Instructions
for common venting requirements. The induced-combustion design
also eliminates the need for a vent damper.
THERMAL-PIN CAST-IRON SECTIONS—These sections speed
heat transfer from the flue gases to the boiler water, with faster ther-
mostat response, providing greater comfort and economy.
TITANIUM COMPOSITE BURNERS—Provide quiet operation,
corrosion resistance, and improved combustion efficiency. Propane
convertible with accessory kit.
CONTROLS—An automatic gas valve and intermittent pilot provide
quiet, dependable operation of the burners. Factory-installed safety
components provide maximum safety against overheating, pressure
buildup, and low-water operation.
INSULATED CASING—Fully insulated with fiberglass for maximum
operating efficiency and economy.
SECTIONS TESTED—Each section is hydrostatically tested to
50 psig. Individual sections are tested to 125 psig at factory.
Assembled sections are tested to 75 psig at the factory. The
maximum allowable pressure is 50 psig for hot water boilers.
UNIT CONVERTIBLE—The Boiler is listed for power venting with field
controls power venting kit.
WARRANTY—The cast-iron sections are covered by a non-prorated
20-year warranty on the entire assembly. Circulator pump covered by
3-year warranty. All other parts are covered by a 1-year limited
warranty.
SPECIFICATIONS
UNIT SIZE
042
075
112
150
187
225
Sections—Fine Grain Cast-Iron
No.
2
3
4
5
6
7
GAS CONTROLS — INTERMITTENT PILOT
Gas Valve
Honeywell
1/2 FPT
In.
Inlet Size
Pilot Assembly
Honeywell
Honeywell
Spark Generator
Burners—Stainless/Titanium Alloy
Burner Orifice—Drill Size
No.
1
2
3
4
5
6
Natural
32
34
34
34
34
34
CONTROLS
Limit Control Range
Pressure/Temperature Gage
°F
Psig
°F
180–240
0–60
60–260
30
Pressure Relief Valve Setting
Circulator Relay—Aquastat
CIRCULATOR
Psig
Honeywell (Factory Installed)
Taco
Model
In.
007
0.70
1-1/4
Full Load Amps
Flange Size FPT
—11—
DIMENSIONS
BW3 MODELS
1 1⁄4″ SUPPLY
23 1⁄4″
VENT
CONNECTOR
A
COMBINATION
LIMIT & RELAY
CONTROL
RELIEF
VALVE
TEMP
PRESSURE
GAGE
1 1⁄4″ RETURN
BLOWER
29″
25 1⁄4″
23″
PRESSURE
SWITCH
5 5⁄8″
5 5⁄8″
CIRCULATOR
INT. PILOT
CONTROL
BURNER
1 3⁄4″
GAS
7″
FRONT
VALVE
LEFT SIDE
RIGHT SIDE
DIMENSIONS (In.)
CLEARANCES (In.)
UNIT SIZE
042
A
VENT CONNECTION
RIGHT SIDE
LEFT SIDE
TOP
6*
6
11
4*
4*
4*
4*
4*
4*
075
14-1/4
17-1/2
20-3/4
24
6
112
BACK
6
150
FRONT
6*
187
*Service clearance requirement 24 in.
225
27-1/4
*With factory-supplied adapter installed.
RATINGS AND CAPACITIES*
RATINGS
HEATING
BOILER
WATER
APPROX
SHIP.
CAPACITY‡
NET RATING
GAS
MAX INPUT
(BTUH)
CAPACITY
(GALLONS)
UNIT
TYPE
Natural
Natural
Natural
Natural
Natural
Btuh
36,000
63,000
94,000
125,000
155,000
AFUE %
84.4
Btuh†
31,000
55,000
82,000
109,000
135,000
WT (Lb)
BW3AAN042
BW3AAN075
BW3AAN112
BW3AAN150
BW3AAN187
42,500
75,000
1.75
3.00
4.25
5.50
6.75
211
263
320
369
418
83.4
112,500
150,000
187,500
83.0
82.7
82.3
* Gas input ratings are for elevations up to 2000 ft. For elevations above 2000 ft, reduce input 4% for each 1000 ft above sea level.
† Selection factors providing for piping loss and starting load are those recommended by the Institute of Boiler and Radiator Manufacturers. Net water boiler
ratings are based on an allowance of 1.15.
‡ In accordance with U.S. Government test procedures.
—12—
MODELS BW4 and BW5
The modern design and attractive appearance of the models
provides efficient fuel usage. A wet base cast iron block with thermal
pins surrounds the combustion area for better heat transfer from flue
gases to water.
BW4 and BW5 Oil-Fired Water Boilers make them ideal for
installation in any area. The boilers are shipped fully
assembled and wired, including all controls (except barometric
draft regulator). The compact 22-gage steel cabinet has a
baked-on enamel paint finish for durability. A 1-in. layer of
thermal insulation is applied inside the jacket for protection
and thermal efficiency. The flame retention head burner
FEATURES
BAROMETRIC DRAFT CONTROL—The factory supplied
barometric draft control can easily be installed in the vent pipe for
optimum draft and combustion efficiency.
CONTROLS—Factory-wired controls on units with tankless hot
water coil include a triple aquastat relay with high/low limit
protection and circulator control.
COMBINATION TRANSFORMER AQUASTAT—A 24-v
transformer is combined with the aquastat assembly. The
transformer will supply power efficient to power a 3-zone system
on BW5 models. Factory installed combination pressure/
temperature gage and a pressure relief valve.
COIL OPTIONS—Units are available with or without tankless
heater coil. The coil provides a supply of hot water for normal
domestic purposes or an accessory tankless heater coil can be
added later.
FACTORY INSTALLED FEATURES—A factory-installed drain is
provided should the boiler ever need to be drained. Oil primary
control prevents boiler in operation in the event of flame loss.
SECTIONS TESTED—Each section is hydrostatically tested to 50
psig. Individual sections are tested to 125 psig at factory.
Assembled sections are tested to 75 psig at the factory. The
maximum allowable pressure is 50 psig for hot water boilers.
EASE OF INSTALLATION—Circulator is shipped pre-wired
with 6 ft bx conduit for easy installation for supply side pumping.
WARRANTY—The cast-iron sections are covered by a non-
prorated 20-year warranty on the entire assembly. Oil burner and
circulator pump covered by 3-year warranty. All other parts are
covered by a 1-year limited warranty.
SOLENOID OIL VALVE—This provides cleaner burning and
quieter operation. Valve is included on all burner types.
SWING BURNER DOOR—This unique design offers uninhibited
access for set-ups, service, and maintaining the burner. Routine
cleaning is also much easier.
SPECIFICATIONS
UNIT SIZE
120
181
239
GENERAL DATA
Sections — Fine Grain Cast Iron
Water Capacity
No.
Gal
3
4
5
9.6
11.6
13.7
Combustion Chamber Target Wall
Draft Regulator
Ceramic Fiber
Furnished
OIL BURNER
Type Manufacturer/Model
Oil Pump
Beckett/Model AFG Flame Retention Head Burner
Single Stage
No. 1 or 2 Fuel Oil
3 Amps
Fuel Type
Rated Load Amps
CONTROLS
Combination Control
Without Heater
High Limit, Circulator Relay, & Cad. Cell Relay
With Heater
Psig
High & Low Limit, Circulator Relay, & Cad. Cell Relay
Pressure/Temperature Gage
0–60
60–260
30
°F
Psig
ASME Pressure Relief Valve
CIRCULATOR
Taco
Model
In.
007
0.70
1-1/4
Full Load Amps
Flange Size FPT
—13—
DIMENSIONS
MODELS BW4 and BW5
1 1⁄4″ SUPPLY
GAGE
C
B
CONTROL
1 1⁄4″
RETURN
36″
3⁄4″ ASME
RELIEF
VALVE
TANKLESS
HEATER
1⁄2″ N.P.T.
19 5⁄8″
FRONT
9″
A
SIDE
REAR
DIMENSIONS (In.)
CLEARANCES (In.)
UNIT SIZE
140
A
B
6
6
6
C
RIGHT SIDE
LEFT SIDE
TOP
16*
16*
16*
16*
16†
18*
17-3/4
21
9-3/4
11-3/8
13
210
280
24-1/4
BACK
FRONT
FLUE
* Clearance 18 in. for BW5.
† Service clearance requirement 24 in.
RATINGS AND PERFORMANCE
**HEAT-
ING CA-
NET
I=B=R
FIRING
RATE
+GPH
INPUT
*MBH
PACITY RATING
MINIMUM CHIMNEY
SIZE/ HEIGHT
BOILER MODEL NO.
NO. SEC.
*MBH
*MBH
A.F.U.E. ++
DIMENSIONS - IN.
WITH TANKLESS WITHOUT TANKLESS
COIL
COIL
A
B
6
6
6
6
6
6
6
6
6
C
8
BW5BAH091
BW5BAH105
BW5BAH140
BW5BAH126
BW5BAH175
BW5BAH210
BW5BAH168
BW5BAH245
BW5BAH280
BW4BAH091
BW4BAH105
BW4BAH140
BW4BAH126
BW4BAH175
BW4BAH210
BW4BAH168
BW4BAH245
BW4BAH280
3
3
3
4
4
4
5
5
5
91
80
70
80
0.65
0.75
1
86.3
85.2
83.4
86.0
83.9
82.4
86.5
83.6
82.0
8-in. x 8-in. x 15 ft
8-in. x 8-in. x 15 ft
8-in. x 8-in. x 15 ft
8-in. x 8-in. x 15 ft
8-in. x 8-in. x 15 ft
8-in. x 8-in. x 15 ft
8-in. x 8-in. x 15 ft
8-in. x 8-in. x 15 ft
8-in. x 8-in. x 20 ft
14-1/2
14-1/2
14-1/2
17-3/4
17-3/4
17-3/4
21
105
140
126
175
210
168
245
280
92
8
119
111
150
178
147
209
236
103
97
8
0.9
1.25
1.5
1.2
1.75
2
9-5/8
9-5/8
9-5/8
11-1/2
11-1/2
11-1/2
130
155
128
182
205
21
21
* MBH = 1,000 BTU per hour / BTU = British Thermal Unit.
** Heating Capacity is based on a 13 percent C02 with a –0.02 in. wc and a #1 smoke or less. Testing was done in accordance with the D.O.E. (Department of
Energy) test procedure.
+GPH = Gallons per hour oil at 140,000 BTU per gallon.
++A.F.U.E. = Annual Fuel Utilization Efficiency based upon D.O.E. test procedure.
As an Energy Star Partner, the manufacturer has determined that this product meets Energy Star guidelines for Energy Efficiency.
—14—
—15—
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
UNIT MUST BE INSTALLED IN ACCORDANCE
WITH INSTALLATION INSTRUCTIONS
Cancels: PDS BSIA.75.2
© 2001 Bryant Heating & Cooling Systems, 7310 W. Morris St., Indpls., IN 46231
PRINTED IN U.S.A
Catalog No. 12BS-1A1
3-01
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