Page 1
Residential / Commercial Gas
Tankless Water Heaters
Fully modulating, gas fired, tankless water heater specifically designed for
residential and commercial applications. Supplies hot water to domestic hot
water systems (directly or indirectly) which can be used with storage tanks,
recirculation systems, hydronic heating systems, radiant floor heating systems,
and/or combined domestic and heating applications.
FEATURES
CONTINUOUS MAXIMUM FLOW RATES UP TO 10.0 GPM
ENERGY STAR®QUALIFIED
AVAILABLE IN NATURAL GAS OR PROPANE (LP)
OUTDOOR MODELS INCLUDE REMOTE CONTROL AS A STANDARD FEATURE
INDOOR MODELS INCLUDE BOTH A REMOTE CONTROL AND POWER
CORD AS STANDARD FEATURES
LOW NOX EMISSIONS
INDOOR MODELS
ATI-110, ATI-310, ATI-510
COMPLIES WITH LEAD FREE STANDARDS
HEAT EXCHANGER (510 MODELS) IS CONSTRUCTED OF COMMERCIALGRADE COPPER
SAFETY FEATURES:
■ Built in Freeze Protection
■ Manual Reset Hi Limit (Set at 194°F)
■ Overheat Cutoff Fuse
■ Inlet and Outlet Thermistors for Constant Temperature Monitoring
■ Flame Sensor
EASY-LINK UP TO 4 UNITS (510 MODELS):
■ With No Additional Parts or Accessories Needed
VENTING AND COMBUSTION
■ 4” Category III Vent
■ Vertical or Horizontal Installation
■ 50’ Max Length, 5 elbows max (90° elbows = 5’ equivalent length)
■ Power Vent
■ Electronic Ignition - No Pilot Light
■ 3” Combustion Air Intake (with optional kit)
OPTIONAL ACCESSORIES
■ Complete Line of Category III Venting
■ Recess Box (outdoor)
■ Pipe Cover
■ Direct Vent Conversion Kits (indoor)
■ Isolation Valve Kits
■ Backflow Preventer
■ Concentric Termination Kits
WARRANTY
■ 15-year limited warranty on heat exchanger in residential applications
■ 10-year limited warranty on heat exchanger in commercial applications
■ 5-year warranty on all parts
OUTDOOR MODELS
ATO-110, ATO-310, ATO-510
510 models
ANSI Z21.10.3 CSA 4.3
A. O. Smith Corporation • 500 Tennessee Waltz Parkway • Ashland City, TN 37015 • 800-527-1953 Toll-free USA Page 1 of 4
www.hotwater.com AOSBG45201
Page 2
Residential / Commercial Gas
13-3/4" (350mm)
10" (254mm)
2
-1/4" (56mm)
21-3/8" (544mm)
20-1/4" (520mm)
1-3/4" (45mm)1-3/4" (45mm)
1-7/8" (47mm)
COLD 3-1/8" (79mm)
HOT 5-1/4" (133mm)
120V 1-3/8" (36mm)
GAS 4-7/8" (124mm)
4" (101 mm)
13-3/4" (350mm)
10" (254mm)
21-3/8" (544mm)
20-1/4" (520mm)
1-3/4" (45mm)1-3/4" (45mm)
1-7/8" (47mm)
COLD 3-1/8" (79mm)
HOT 5-1/4" (133mm)
120V 1-3/8" (36mm)
GAS 4-7/8" (124mm)
7-7/8" (203mm)
1-5/8" (43mm)
2-1/4" (56 mm) COLD
3-7/8" (98mm) GAS
4-7/8" (124mm) HOT
1
" (26mm)
4-7/8" (123mm) 120V
7-3/4" (196mm)
2-1/4" (56 mm) COLD
3
-7/8" (98mm) GAS
4-7/8" (124mm) HOT
1
" (26mm)
4
" (102mm)
4-7/8" (123mm) 120V
7-3/4" (196mm)
2-1/4" (57mm)
13-3/4" (350mm)
10" (254mm)
1-3/4" (45mm) 1-3/4" (45mm)
1-3/8" (36mm)
21-3/8" (544mm)
20-1/4" (520mm)
1-7/8" (47mm)
HOT 5-1/4" (133mm)
120V 1-3/8" (36mm)
GAS 4-7/8" (124mm)
COLD 3-1/4" (84mm)
4" (101 mm)
13-3/4" (350mm)
10" (254mm)
1-3/4" (45mm)
1-3/4" (45mm)
21-3/8" (544mm)
20-1/4" (520mm)
1-7/8" (47mm)
HOT 5-1/4" (133mm)
120V 1-3/8" (36mm)
GAS 4-7/8" (124mm)
COLD 3-1/4" (84mm)
1-5/8" (43mm)
5" (128mm)
7-7/8" (203mm)
4-3/8" (113mm)
19-3/8" (493mm)
COLD 2-7/8" (71mm)
1" (26mm)
HOT 6-1/2" (164mm)
9-1/2" (241mm)
120VAC 3-7/8" (99mm)
GAS 5-1/4" (135mm)
4-3/8" (113mm)
1-5/8" (43mm)
19-3/8" (493mm)
COLD 2-7/8" (71mm)
1" (26mm)
HOT 6-1/2" (164mm)
9-1/2" (241mm)
120VAC 3-7/8" (99mm)
GAS 5-1/4" (135mm)
Tankless Water Heaters
GAS CONSUMPTION
INPUT
MODEL
NUMBER
ATI-110-N
ATI-110-P
ATO-110-N
ATO-110-P
ATI-310-N
ATI-310-P
ATO-310-N
ATO-310-P
ATI-510-N
ATI-510-P
ATO-510-N
ATO-510-P
15-150 psi water pressure. 40 psi or above recommended for maximum flow.
*Category III Required
**Current numbers based on factory testing, 0.5 GPM required for activation, 0.4 GPM required for continuous fire after initial ignition.
Pressure only relief valve required (Min. 200,000 BTUs. 150 PSI).
FUEL
TYPE
Natural 19,500 140,000 0.82 5.0 10.5 6.6 20 1/4 13 3/4 7 3/4 120 0.61 4” O.D. 3” O.D. 3/4” NPT 38
Propane 19,500 140,000 0.82 8.0 14.0 6.6 20 1/4 13 3/4 7 3/4 120 0.61 4” O.D. 3” O.D. 3/4” NPT 38
Natural 19,500 140,000 0.82 5.0 10.5 6.6 20 1/4 13 3/4 7 3/4 120 0.61 N/A N/A 3/4” NPT 38
Propane 19,500 140,000 0.82 8.0 14.0 6.6 20 1/4 13 3/4 7 3/4 120 0.61 N/A N/A 3/4” NPT 38
Natural 11,000 190,000 0.82 5.0 10.5 8.0 20 1/4 13 3/4 9 1/2 120 0.73 4” O.D. 3” O.D. 3/4” NPT 43
Propane 11,000 190,000 0.82 8.0 14.0 8.0 20 1/4 13 3/4 9 1/2 120 0.73 4” O.D. 3” O.D. 3/4” NPT 43
Natural 11,000 190,000 0.82 5.0 10.5 8.0 20 1/4 13 3/4 9 1/2 120 0.73 N/A N/A 3/4” NPT 43
Propane 11,000 190,000 0.82 8.0 14.0 8.0 20 1/4 13 3/4 9 1/2 120 0.73 N/A N/A 3/4” NPT 43
Natural 11,000 199,000 0.82 5.0 10.5 10.0 20 1/4 13 3/4 9 1/2 120 0.75 4” O.D. 3” O.D. 3/4” NPT 45
Propane 11,000 199,000 0.82 8.0 14.0 10.0 20 1/4 13 3/4 9 1/2 120 0.75 4” O.D. 3” O.D. 3/4” NPT 45
Natural 11,000 199,000 0.82 5.0 10.5 10.0 20 1/4 13 3/4 9 1/2 120 0.75 N/A N/A 3/4” NPT 45
Propane 11,000 199,000 0.82 8.0 14.0 10.0 20 1/4 13 3/4 9 1/2 120 0.75 N/A N/A 3/4” NPT 45
MIN.
BTU/H
MAX.
BTU/H
ENERGY
FACTOR
ATI-110 INDOOR DIMENSIONS
CLEARANCES: Top 12”, Bottom 12”, Front 4”, Back 1”, Sides 2”
INLET GAS
PRESSURE
MIN.
MAX.
W.C.
W.C.
MAX
HEIGHT WIDTH DEPTH
GPM**
DIMENSIONS
(INCHES)
VOLT AMP FLUE*
ATO-110 OUTDOOR DIMENSIONS
CLEARANCES: Top 36”, Bottom 12”, Front 24”, Back 1”, Sides 2”
INTAKE
(OPTIONAL)
HOT/COLD
GAS CONN.
APPROX.
SHIPPING
WEIGHT
(LBS)
ATI-310 and ATI-510 INDOOR DIMENSIONS
CLEARANCES: Top 12”, Bottom 12”, Front 4”, Back 1”, Sides 2”
www.hotwater.com AOSBG45201
ATO-310 and ATO-510 OUTDOOR DIMENSIONS
CLEARANCES: Top 36”, Bottom 12”, Front 24”, Back 1”, Sides 2”
Page 2 of 4
Page 3
Residential / Commercial Gas
0
10
2
0
30
4
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0
0
.0
2
.0
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.0
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.0
8
.0
0
2
0
40
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80
100
1
20
Head (ft)
Pressure Loss (psi)
Flow Rate (gpm)
0
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7
020406080100120140
Flow Rate (GPM)
T
emper ature Rise (°F)
0
10
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30
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50
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
0
20
40
60
80
100
120
Head (ft)
Pressure Loss (psi)
Flow Rate (gpm)
0
1
2
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8
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020406080100120140
Flow Rate (GPM)
Temp erature Ris e (°F)
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10
20
30
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50
60
70
80
0.0 2.0 4.0 6.0 8.0 10.0 12.0
0
20
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60
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100
120
Flow Rate (gpm)
Head (ft)
Pressure Loss (psi)
Set temperature of 122°F or lower
Set temperature of 131°F or higher
0.0
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020406080100120140
Te mp er at ur e R is e ( °F)
Tankless Water Heaters
110 models
Indoor/Outdoor Pressure Loss Comparison of Flow Rate vs. Temperature Rise
Flow Rate (gpm)Flow Rate (gpm)
310 models
Indoor/Outdoor Pressure Loss Comparison of Flow Rate vs. Temperature Rise
510 models
Indoor/Outdoor Pressure Loss
Comparison of Flow Rate vs. Temperature Rise
Flow Rate (gpm)
www.hotwater.com AOSBG45201
Page 3 of 4
Page 4
Residential / Commercial Gas
Tankless Water Heaters
Specification for the 510
The fully modulating, on-demand, gas fired tankless water heater(s) shall be A. O. Smith Tankless Water Heater model ATI-510 or ATO-510, having a maximum input rating of 199,000
Btu/h and available in NG or LP. The heater shall have ¾ in. male NPT water and gas connections. The inlet gas supply pressures shall be 5.0 in. WC (min.) up to 10.5 in. WC (max) for
NG and 8.0 in. WC (min.) up to 14 in. WC (max.) for LP. The heater(s) shall be supplied with a temperature remote, 9007603005, that can be installed up to 400 ft. from the heater
using 18 gauge (minimum) control wire. The temperature remote shall provide diagnostic information, fault history, and heater set temperature. The heater(s) shall operate using 120
V / 60 Hz power source. The indoor heater(s) will incorporate a factory installed power cord.
The indoor heater(s) shall be vented with 4” diameter Category III vent pipe with a length not to exceed 50 ft. (equivalent), terminating horizontally or vertically. The indoor heater(s)
can be direct vented with optional direct vent conversion kit, 9007667005, using 3” diameter pipe. The intake pipe may use material such as PVC, ABS, aluminum, or Category III pipe
and cannot exceed 50 ft. (equivalent) length. The outdoor heater(s) shall be constructed with an integral exhaust vent on the front of the heater.
The water heater(s) shall use an copper, fin tube heat exchanger with quick release brass or bronze waterways. The heater(s) shall be controlled by an onboard solid-state printed
circuit board which uses the following factory installed components: thermistors to monitor water temperature; a flow sensor to measure flow rate; a flame sensor to monitor
combustion; an Air-Fuel Ratio Rod to measure and adjust air input in order to maintain optimal combustion efficiency. The heater also consists of inline fusing and surge absorbers
for electrical surge protection, an electronic spark igniter, aluminized stainless steel burners, a hi-limit temperature switch, modulating gas valve, dual freeze protection that will
automatically fire the heater and use heating blocks to protect the heat exchanger, and an overheat cutoff fuse.
The heater(s) can manifold to Easy-Link up to 4 heaters to provide additional capacity. The Easy-Link controls shall be built onto the onboard solid-state printed circuit board and does
not require external controls. The linking control wire shall be supplied with the heater. The Easy-Link control shall modulate the system for the most efficient performance. The EasyLink control shall rotate the priority heater every 12 hours of operation time or 100 starts for balanced duty/cycle operation.
The heater(s) shall be CSA approved for sale in the United States and Canada, ENERGY STAR® qualified with a minimum energy factor of 0.82, meets the energy efficiency requirements
of the U. S. Department of Energy and ASHRAE 90.1-2007, complies with Low NOx emissions of 40 ng/J or 55 ppm, and shall be certified to NSF 5 Standards.
For Technical Information call 1-877-737-2840. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
Page 4 of 4
www.hotwater.com AOSBG45201
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