Heavy-Duty Commercial Gas
Tankless Water Heaters
TANKLESS HEAVY-DUTY COMMERICAL MODELS
Fully modulating, gas-fired, tankless water heaters specifically designed for
heavy-duty commercial applications. Can be installed either outdoors, indoors, or
direct vented. Capable of supplying domestic hot water systems and/or combined
domestic and heating applications (local codes dictate proper compliance).
Multiple units can be combined in a system of water heaters to provide for larger
applications such as hotels, large restaurants and apartment complexes.
FEATURES
PRIMARY HEAT EXCHANGER IS CONSTRUCTED OF HRS35 COMMERCIALGRADE COPPER
■ Stronger than standard copper and more resilient against erostion
CONTINUOUS MAXIMUM FLOW RATES UP TO 9.0 GPM
EASY-LINK UP TO 4 UNITS
■ Multi-link up to 20 units with TM-MC01 (no multiple controller needed)
COMBINED INDOOR/OUTDOOR MODELS
AVAILABLE IN NATURAL GAS OR PROPANE (LP)
ASME MODELS AVAILABLE
LOW NOx EMISSIONS
COMPLIES WITH LEAD FREE STANDARDS
SAFETY FEATURES:
■
■
■
■
■
■
■
ATIO-710-N
ATIO-710-P
ATIO-710-AN
ATIO-710-AP
Built in Freeze Protection
Manual Reset Hi Limit (Set at 194°F
Overheat Cutoff Fuse
Inlet, Outlet & Mixing Thermistors for Constant Temperature Monitoring
Air Fuel Ratio Rod
GFI Fuse & Surge Absorber
Power Supply Connection
VENTING AND COMBUSTION
■
■
■
■
■
■
4” Category III Stainless Steel
Vertical or Horizontal Installation
50’ Max Length, 5 elbows max (90° elbows=5’ equivalent length)
Power Vent
Electronic Ignition - No Pilot Light
4” Combustion Air Intake (with optional kit)
ANSI Z21.10.3
CSA 4.3
OPTIONAL ACCESSORIES
■
■
■
■
■
■
Multi-Unit Controller (Multi-Unit System)
Remote Temperature Controller
Direct Vent Conversion Kit
Pipe Cover
Vent Cap
Backflow Prentor
WARRANTY
■ 10-year limited warranty on heat exchanger in commercial applications
■ 5-year warranty on all parts
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Heavy-Duty Commercial Gas
Tankless Water Heaters
TANKLESS HEAVY-DUTY COMMERICAL MODELS
GAS CONSUMPTION
INPUT
MODEL
NUMBER
INLET GAS
PRESSURE
FUEL
TYPE
MIN.
BTU/H
MAX.
BTU/H
THERMAL MIN. MAX.
EFFICIENCY W.C. W.C.
ATIO-710-N
Natural
24,000
240,000
82%
5.0
ATIO-710-P
Propane
24,000
240,000
84%
DIMENSIONS
(INCHES)
INTAKE
HOT/COLD
FLUE*** (OPTIONAL) GAS CONN.
APPROX.
SHIPPING
WEIGHT
(LBS)
GPM**
HEIGHT WIDTH DEPTH VOLT
AMP
10.5
0.5 - 9.0
23-5/8
18-1/2
8-7/8
120
0.94
4” O.D.
4” O.D.
3/4” NPT
66
8.0
14.0
0.5 - 9.0
23-5/8
18-1/2
8-7/8
120
0.94
4” O.D.
4” O.D.
3/4 ” NPT
66
ATIO-710-AN* Natural
24,000
240,000
82%
5.0
10.5
0.5 - 9.0
23-5/8
18-1/2
8-7/8
120
0.94
4” O.D.
4” O.D.
3/4 ” NPT
66
ATIO-710-AP* Propane
24,000
240,000
84%
8.0
14.0
0.5 - 9.0
23-5/8
18-1/2
8-7/8
120
0.94
4” O.D.
4” O.D.
3/4 ” NPT
66
All dimensions in inches.
15-150 psi water pressure. 40 psi or above recommended for maximum flow.
* ASME models
**Current numbers based on factory testing, 0.4 GPM required for continuous fire after initial ignition.
***Category III required
Pressure only relief valve requires (Min. 240,000 BTUs. 150 PSI). Min 40 PSI or above recommended for maximum flow.
CLEARANCES:
INDOOR: Top 12”, Bottom 12”, Front 24”, Back 1”, Sides 2”
OUTDOOR: Top 36”, Bottom 12”, Front 24”, Back 1”, Sides 2”
Flow Rate Vs. Temperature Rise
10.0
9.0
Flow Rate (gpm)
8.0
18-1/2” (470mm)
15-3/4” (399mm)
7” (179mm)
7.0
8-7/8” (226mm)
6.0
5.0
4-1/2” (114mm)
4.0
3.0
2.0
1.0
0.0
0
20
40
60
80
100
120
140
Temperature Rise (°F)
Pressure Drop
60
25
50
20
40
15
30
10
20
5
10
0
0
0.0
2.0
4.0
6.0
8.0
10.0
Flow Rate (gpm)
Set temperature of 145° or lower
Set temperature of 150° or higher
Head Feet
Pressure Loss (psi)
30
24-5/8” (626mm)
Set temperature of 150° or higher
23-5/8” (600mm)
Set temperature of 145° or Lower
Above shown rate is based on single unit only
1-1/8” (27.8mm)
3-1/8” (80.8mm)
4-5/8” (118.3mm)
6-1/4” (159mm)
1-5/8” (42mm) 120v
1-1/2” (40.9mm) COLD
5-7/8” (149mm) HOT
5-7/8” (147mm) GAS
Specification
Water heater(s) shall be Model _________________ as manufactured by A. O. Smith. The water heater(s) shall be a copper coil integral fin and tube construction with quick release brass or
bronze waterways. Heater(s) will be factory assembled and tested. The heater shall be vented with 4” Stainless steel Category III vent pipe a distance not to exceed 50’ (equivalent) feet
terminating vertically or horizontally as prescribed. Intake air with optional direct vent kit may be of such material as PVC not to exceed a total of 50’ (equivalent). The heater(s) shall be
controlled by onboard solid state printed circuit board monitoring incoming and outgoing temperatures with factory-installed thermistors, sensing and controlling flow rate to set point
temperature with control both air and gas mixture inputs to maintain thermal combustion efficiency. Unit also consists of ground fault interrupter, inline fusing, spark ignition and sensor
system, aluminized stainless steel burners, air-fuel ratio rod, Hi limit switch, modulating and proportional gas valves, freeze protection sensor and heating block and overhead cutoff fuses.
The water heater(s) shall be CSA listed, meets the energy efficiency requirements of ASHRAE 90. 1b-1992 and complies with SCAQMD rule 1146.2 and other air quality management districts
with similar requirements for low NOx emissions.
For Technical Information call 1-877-737-2840. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
Revised February 2013
www.hotwater.com
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