Page 1
Automatic Circulating
Water Heaters
The ENERGY STAR® Qualified A. O. Smith high efficiency condensing XP
PLUS
Water Heater utilizes a
state-of-the-art heat exchanger and control technology to provide large volumes of hot water for
demanding commercial and industrial potable hot water applications. The all stainless steel water tube
heat exchanger construction allows the XP
PLUS
Water Heater to operate in a continuous condensing
mode while maximizing longevity and delivering thermal efficiencies as high as 99% when operating in
low temperature applications.
A unique multi-burner design is control sequenced and modulated to produce turndown rates of up to
20:1. Precise temperature control and accurate load matching produce smooth system operation and
eliminates wasteful short cycling and temperature overshooting.
ADVANCED MULTI-BURNER, LOW NOx
COMBUSTION TECHNOLOGY
• Venturi-mixing gas/air ratio system - works with
variable speed blower to precisely mix gas and air
throughout the firing range.
• Fully modulating capability prevents energy-stealing
short cycling and provides smooth system operation
with higher overall system efficiencies.
LOW NOx OPERATION
• Complies with SCAQMD Rule 1146.2 for XWH1000
through XWH2000 and Rule 1146.1 for XWH2600
and XWH3400, and other air quality management
districts with similar requirements for low NOx
emissions.
ADVANCED SOLA CONTROL
• Large touch screen user interface.
• Factory standard with MODBUS protocol connections.
• The latest in energy saving algorithms.
• Includes remote tank temperature control to adjust
tank temperature at the water heater – modulates
the water heater to maintain tank set point
temperature within +/-1 degree.
• Water heater output control features 20:1 turndown
ratio on models 2 million btuh and up, 10:1 turndown
ratio on models 1.7 million btuh and down.
ALL-BRONZE FACTORY-MOUNTED
PUMP(S)
• Integrally mounted, wired, and controlled by the
water heater control.
• Factory-sized for proper flow between water heater
and storage tank.
• Allows 50 equivalent feet of piping between water
heater and tank.
MULTI-PASS/MULTI-BURNER
CONDENSING STAINLESS STEEL HEAT
EXCHANGER
• Utilizes leading-edge multi-pass water tube heat
exchanger to maximize heat transfer.
• Designed for fully condensing operation throughout
the heating range.
• All heating surfaces are 316L stainless steel to
provide a long and trouble-free service life.
• Saves both fuel and operating cost with every heating
cycle.
• Impervious to thermal shock.
DIRECT VENT FLEXIBILITY
• Direct vent up to 100 equivalent feet of pipe.
• Sidewall or vertical.
• Lower installation cost with approved CPVC/PVC
venting material – uses CPVC for first 10 feet and
PVC thereafter.
• Approved for use with UL approved AL29-4C®
stainless steel venting materials.
FACTORY START-UP INCLUDED
• Required for activating warranty and assuring
maximum operating performance. Contact your local
sales representative or Authorized Start-Up Agent to
arrange a FREE certified start-up.
MEETS THE THERMAL EFFICIENCY
REQUIREMENTS OF THE U. S.
DEPARTMENT OF ENERGY AND
CURRENT EDITION ASHRAE/IES 90.1
UP TO 96% THERMAL EFFICIENCY (AHRI
CERTIFIED)
5-YEAR HEAT EXCHANGER WARRANTY
• For complete information, consult written warranty or
contact A. O. Smith.
Please note: The XP
These models are approved for potable water heating applications only and cannot be used in closed loop space/hydronic heating
applications.
©October 2016 A. O. Smith Corporation. All rights reserved.
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
PLUS
water heater models XWH -1000 thru 3400 are certified to the ANSI Z21.10.3-CSA 4.3 water heater standard.
Page 1 of 6
AOSBD25000
Page 2
Automatic Circulating
Water Heaters
OTHER XP
• CSA certified to the ANSI Z21.10.3-CSA 4.3
water heater standard
• Honeywell sola control with color touch
screen LCD display
• Inlet/outlet and remote tank temperature
• Onboard Modbus communications
• Logs faults, run time, cycles
• Redundant flow and low water protection
• Multi-burner sequencing models 2 million
• Redundant ignition controls – should one
• Alarm buzzer
• Remote tank temperature sensor included
• 20:1 turndown ratio on models 2 million btuh
and up, 10:1 turndown ratio on models 1.7
million btuh and down
• Horizontal and vertical direct and sidewall
vent options up to 100 equivalent feet of
piping
• Approved for CPVC/PVC plastic vent materials
PLUS
FEATURES:
display
- factory installed LWCO and flow switch(s)
btuh and up have 4 burners; models 1.7
million btuh and down have 2 burners
burner fail remaining burners continue
to heat
• Meets ASME CSD-1/GE gap codes – factory
standard
• Direct spark ignition
• Factory-installed electrical disconnect
• All bronze factory-mounted pump(s)
• 316L stainless steel heat exchanger
• ASME 160# working pressure
• ASME rated pressure relief valve – 125 PSI
PLUS
XP
OPTIONS:
• Condensate neutralization kit
• Vent termination kits
• Skid mounted systems
Recovery Capacities
Model
Number
XWH-1000 920,000
XWH-1300 1,300,000
XWH-1700 1,700,000
XWH-2000 2,000,000
XWH-2600 2,600,000
XWH-3400 3,400,000
BTU/HR
Natural Gas
Input
Recovery Capacities
Temperature Rise
Water Flow
°F 40 60 70 80 90 100 120 140
°C 22 33 39 44 50 56 67 78
GPH 2,662 1,775 1,521 1,331 1,183 1,065 887 761
LPH 10,078 6,719 5,759 5,039 4,479 4,031 3,359 2,880
GPH 3,742 2,495 2,139 1,871 1,663 1,497 1,247 1,069
LPH 14,167 9,444 8,095 7,083 6,296 5,667 4,722 4,048
GPH 4,904 3,269 2,802 2,452 2,180 1,962 1,635 1,401
LPH 18,565 12,376 10,608 9,282 8,251 7,426 6,188 5,304
GPH 5,794 3,862 3,311 2,897 2,575 2,317 1,931 1,655
LPH 21,931 14,621 12,532 10,966 9,747 8,773 7,310 6,266
GPH 7,501 5,000 4,286 3,750 3,334 3,000 2,500 2,143
LPH 28,393 18,929 16,225 14,196 12,619 11,357 9,464 8,112
GPH 9,891 6,594 5,652 4,945 4,396 3,956 3,297 2,826
LPH 37,441 24,961 21,395 18,721 16,641 14,976 12,480 10,697
©October 2016 A. O. Smith Corporation. All Rights Reserved
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
Page 2 of 6
AOSBD25000
Page 3
Automatic Circulating
Water Heaters
SINGLE HEAT EXCHANGER MODELS
Rough In Dimensions (Single)
Models XWH-1000 XWH-1300 XWH-1700
Dimensions Inches mm Inches mm Inches mm
Flue Outlet Diameter 6 152 8 152 8 203
Air Intake Diameter 6 152 6 152 8 203
Wat Inlet 2 inch NPT 2-1/2 inch NPT
Water Outlet 2 inch NPT 2-1/2 inch NPT
Gas Inlet 2 inch NPT 2 inch NPT
A 47 1199 49 1245 57 1448
B 67 1702 68 1727 76 1930
C 29 737 29 737 29 737
D 37 940 38 965 37 940
E 23 584 23 584 24 610
F 9 29 9 229 9 229
G 34 864 34 864 34 864
H 44 1118 45 1143 45 1143
J 6 152 6 152 6 152
K 11 279 11 279 11 279
L 12 305 11 279 12 305
Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement.
©October 2016 A. O. Smith Corporation. All Rights Reserved
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
Page 3 of 6
AOSBD25000
Page 4
Automatic Circulating
Water Heaters
DOUBLE HEAT EXCHANGER MODELS
Rough In Dimensions (Double)
Models XWH-2000 XWH-2600 XWH-3400
Dimensions Inches mm Inches mm Inches mm
Flue Outlet Diameter 8 203 8 203 10 254
Air Intake Diameter 8 203 8 203 10 254
Wat Inlet 3 inch NPT 4 inch NPT
Water Outlet 3 inch NPT 4 inch NPT
Gas Inlet 2 inch NPT 3 inch NPT
A 47 1199 49 1245 57 1448
B 78 1981 80 2032 91 2311
C 36 914 37 940 37 940
D 22 559 22 559 22 559
E 40 1016 41 1041 41 1041
F 7 178 6 152 6 152
G 10 254 10 254 10 254
H 4 102 4 102 4 102
J 20 508 19 483 19 483
K 12 305 12 305 13 330
Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement.
©October 2016 A. O. Smith Corporation. All Rights Reserved
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
Page 4 of 6
AOSBD25000
Page 5
Automatic Circulating
Water Heaters
VERSATILE MULTI-VENTING CONFIGURATIONS
VERTICAL VENTING
HORIZONTAL VENTING
DIRECT VENT, VERTICAL VENTHORIZONTAL INTAKE
DIRECT VENT, HORIZONTAL VENTVERTICAL INTAKE
DIRECT VENT HORIZONTAL
DIRECT VENT VERTICAL
Direct or sidewall vent for up to 100 equivalent feet of pipe. Lower installation cost with approved CPVC/PVC venting material
– uses CPVC for first 10 feet and PVC thereafter. Also approved for use with UL approved AL 29-4C stainless steel venting
materials. For the detailed venting instructions review the XP
PLUS
water heater instruction manual at www.hotwater.com.
APPROVED VENT AND AIR INTAKE FITTINGS
EXHAUST/VENT TERMINATIONS (PVC) PART #S
Models Pipe Size
XWH 1000 6” 320884-000 321765-000
XWH 1300
XWH 1700
XWH 2000
XWH 2600
XWH 3400 10” 320884-002 321765-002
Please note: When direct or sidewall venting, the water heater’s CSA certification requires that only the above approved vent and combustion air intake terminations be used.
8” 320884-001 321765-001
Vertical
(PVC Rain Cap)
FLOW RATE
RECOMMENDED FLOW RATES @ 0-12 GRAINS PER GALLON
Models
XWH 1000 25 70 17.5
XWH 1300 25 99 22
XWH 1700 25 129 23
XWH 2000 25 153 17.5
XWH 2600 25 198 22
XWH 3400 25 261 23
Notes: For hard water systems with water hardness greater than 12 grains per gallon, A. O. Smith
recommends a water softener be installed and maintained.
The factory installed/supplied pump is sized to maintain a ΔT of 25°F through the water heater at
100% fire. In addition to the pressure loss through the water heater, the factory supplied pump is
sized for an additional 50 feet of equivalent feet of piping between the water heater and a storage
tank. Consult the factory for systems where the piping between the water heater and the tank
exceed 50 equivalent feet.
Temperature
Rise (ΔT °F)
GPM
In Feet of Head (P)
Horizontal
(PVC Tee w/
Screens)
Pressure Loss
XWH 1000 6” 321764-000
XWH 1300
XWH 1700
XWH 2000
XWH 2600
XWH 3400 10” 321764-002
GAS PRESSURE REQUIREMENTS
Model Number Type of Gas
1000, 1300, 1700,
2000, 2500, 34000
ELECTRICAL REQUIREMENTS
Model
Number
XWH-1000 120V 60 30
XWH-1300 120V 60 30
XWH-1700 120V 60 30
XWH-2000 120V 60 60
XWH-2600 120V 60 60
XWH-3400 120V 60 60
AIR INTAKE TERMINATION (PVC) PART #S
Models Pipe Size
8” 321764-001
Maximum Supply
Pressue
Inches
W.C .
Natural 14 3.49 4 1
Propane 14 3.49 4 2
Supply
Voltage
(Volts)
Frequency
(Hz)
Current
(Amps)
kPa
Combustion Air
Intake
(Elbow)
Minimum Supply
Pressue
Inches
W.C .
kPa
©October 2016 A. O. Smith Corporation. All Rights Reserved
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
Page 5 of 6
AOSBD25000
Page 6
Automatic Circulating
Water Heaters
XWH SUGGESTED SPECIFICATION
The gas-fired automatic circulating water heater(s) shall be A. O. Smith XP
capable of supplying no less than __________GPH at a 100°F temperature rise when fired with (Natural/Propane) gas. 1) The water heater shall be capable of
full modulation with a turndown ratio of _____:1 (use 10:1 WH models 1000 thru 1700, use 20:1 WH models 2000 thru 3400). 2) The water heater shall bear
the ASME “HLW” stamp and shall be National Board registered (CRN in Canada) for 160 PSI working pressure. 3) The water heater(s) shall be equipped with
a factory-installed 125# PSIG ASME Pressure Relief Valve. 4) The water heater(s) shall be design-tested and certified to the ANSI Z21.10.3-CSA 4.3 Standards
by CSA International. 5) The water heater shall operate up to 96% thermal efficiency at full fire as certified with AHRI. 6) The water heater shall be certified for
indoor installation and approved for installation on combustible floors.
The heat exchanger: 1) Shall be a dual burner multi-pass design with three sets of helical wound 316L stainless steel water tubes that completely encircle
dual combustion chambers for maximum efficiency. 2) There shall be no bolts, gaskets or “O” rings in the header configuration. 3) The heat exchanger shall
be removable and replaceable as a single component 3) The fully condensing heat exchanger shall be designed to allow all condensate to be drained from the
bottom of the heat exchanger to ensure that condensation does not collect or interfere with good water heater operation due to long periods of operation in the
condensing mode. 4) The low water volume heat exchanger shall be immune to thermal shock. 5) The entire heat exchanger shall carry a five (5) year warranty.
Water Heater Pump: 1) The automatic circulating water heater(s) shall be supplied with a factory-sized and wired all bronze circulating pump(s). 2) The pump(s)
shall be interfaced with and managed by the water heater’s control and cycled as needed for most efficient operation.
Burners: 1) The water heater shall have (two/four) modulating burners capable of modulating between 20% and 100% fire while providing smooth starts and
clean combustion. 2) Each burner shall be a premix design, constructed of high temperature stainless steel and utilize a woven metal fiber mesh covering, be
warranted for 5 years, and fire in a radial 360-degree flame pattern. 3) Burner ignition shall be by direct spark with flame monitoring via a flame sensor.
Water Heater Controls: 1) The water heater shall feature the Sola control with a multi-colored LCD touch screen display. 2) The control shall provide intuitive
user operation and setup of the water heater. 3) The control will cascade/sequence, rotate and modulate the water heater’s multiple burners providing an overall
turndown rate of (20/10):1. 4) The control shall display current inlet, outlet, and tank temperatures along with current firing rate for each burner. 5) Data logging
with run time/number of cycles and all faults shall be recorded. 6) The water heater shall be BMS ready with factory standard with onboard MODBUS protocol
connections. 7) A remote tank temperature sensor shall be shipped loose with the unit to be installed in the storage tanks and allow remote tank temperature
control and monitoring at the water heater. 8) The tank temperature set point and set point differential shall be adjustable and shall be maintained within +/-1
degree. 9) Night temperature setback shall be standard. 10) Redundant flow and low water protection shall be provided with factory installed and wired LWCO
and flow switch(s). 11) Redundant ignition controls (one per burner) shall allow individual burner operation. 11) Factory installed Alarm Buzzer will be provided
along with dry contacts for remote alarm if desired.
Frame and Jacket Design: 1) Shall be constructed of a rugged all welded extruded aluminum alloy frame with heavy gauge steel removable jacket panels that
allow easy access and service. 2) The jacket panels shall be painted on both sides with a high quality powder coating that is approved for outdoor use. 3)
Primary/main service access shall be provided by a latched and hinged stainless steel access door(s) that provides access to most electrical and serviceable
components from the front of the unit.
Venting: 1) The water heater shall be certified for direct horizontal through-the-wall venting or direct vertical venting; in addition to sidewall or conventional
vertical venting. 2) The water heater shall be capable of horizontal sidewall or direct venting up to 100 equivalent feet without the aid of any optional sidewall
vent fans or blowers. 3) The water heater shall be CSA approved for venting with CPVC or a combination of CPVC and PVC venting materials using CPVC for
first 10 feet and PVC thereafter. In addition the water heater shall be approved for use with UL approved AL29-4C stainless steel venting materials where local
codes may require.
Standards: 1)The water heater shall have an independent laboratory rating for Oxides of Nitrogen (NOx) to meet the requirements of South Coast Air Quality
Management District in Southern California and the requirements of Texas Commission on Environmental Quality. 2) The water heater shall built to and meet the
ASME – CSD-1 code requirements as factory standard. 3) The water heater shall be compliant with California Code, Factory Mutual, Massachusetts Code and
Kentucky Codes and standards.
Factory Start-Up: 1) The water heater manufacturer shall furnish, at no additional charge, the complete certified factory start-up that is required for activating the
warranty and ensuring
PLUS
model XWH_____________ having an input rating of _________ BTU/hr and
For technical information, call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
©October 2016 A. O. Smith Corporation. All rights reserved.
www.hotwater.com | 800-527-1953 Toll-Free USA
Page 6 of 6
AOSBD25000
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