Residential/Commercial Gas
Ultra-Low NOx Tankless Water Heaters
Fully modulating, gas fired, tankless water heater with sealed combustion and power vented flue. Indoor and outdoor models available for residential applications. Supplies hot water to domestic hot water systems (directly or indirectly) can be used with water storage tanks, recirculation systems, hydronic heating systems, radiant floor heating systems, and/or combined domestic & heating applications.
FEATURES
COMPLIES WITH ULTRA-LOW NOx REGULATIONS
MAXIMUM FLOW RATES UP TO 10.0 GPM
PRIMARY HEAT EXCHANGER
■ Stronger than standard copper and more resilient against erosion
INDOOR AND OUTDOOR MODELS AVAILABLE
OUTDOOR MODELS INCLUDE REMOTE CONTROL AS A STANDARD FEATURE
INDOOR MODELS INCLUDE BOTH A REMOTE CONTROL AND POWER CORD AS STANDARD FEATURES
ENERGY STAR® QUALIFIED
AVAILABLE IN NATURAL GAS
EASY-LINK UP TO 4 UNITS (510U MODELS ONLY)
■ With no additional parts or accessories needed
MULTI-LINK UP TO 20 UNITS (510U MODELS ONLY)
COMPLIES WITH LEAD FREE STANDARDS
ATI-510U AND ATO-510U CAN BE USED IN BOTH RESIDENTIAL AND COMMERCIAL APPLICATIONS
SAFETY FEATURES:
■Built-in Freeze Protection
■Manual Reset Hi Limit (Up to 194°F)
■Overheat Cutoff Fuse
■Inlet and Outlet Thermistors for Constant Temperature Monitoring
■Air Fuel Ratio Rod
■Flame Sensor
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
■3” Combustion Air Intake (with optional kit)
OPTIONAL ACCESSORIES
■Complete Line of Stainless Steel Venting
■Recess Box (outdoor)
■Pipe Cover
■Direct Vent Conversion Kit (indoor)
■Isolation Valve Kits
■Backflow Preventor
■Concentric Termination Kits
WARRANTY
■12-year limited warranty on heat exchanger in residential applications
■5-year limited warranty on heat exchanger in commercial applications
■5-year limited warranty on all parts
ATI-510U
ATO-510U
®
(510U models only)
ANSI Z21.10.3
CSA 4.3
Page 1 of 4
AOSBG45100
Residential/Commercial Gas
Ultra-Low NOx Tankless Water Heaters
ULTRA-LOW NOx TANKLESS MODELS
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GAS CONSUMPTION |
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INLET GAS |
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DIMENSIONS |
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INPUT |
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PRESSURE |
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IN INCHES |
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HOT/COLD |
UNIT |
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MODEL |
FUEL |
MIN. |
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MAX. |
ENERGY |
MIN. |
MAX. |
MAX |
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INTAKE |
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FACTOR |
HEIGHT |
WIDTH |
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DEPTH |
VOLT |
AMP |
FLUE* |
GAS |
WEIGHT |
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NUMBER |
TYPE |
BTU/H |
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BTU/H |
(EF) |
W.C. |
W.C. |
GPM** |
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(OPTIONAL) |
CONN. |
(LBS) |
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ATI-110U-N |
Natural |
15,000 |
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140,000 |
0.82 |
5.0 |
10.5 |
6.6 |
20-1/2 |
13-4/5 |
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8-1/2 |
120 |
0.54 |
4” O.D. |
3.0” O.D. |
3/4” NPT |
37 |
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ATO-110U-N |
Natural |
15,000 |
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140,000 |
0.82 |
5.0 |
10.5 |
6.6 |
20-1/2 |
13-4/5 |
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8-1/2 |
120 |
0.54 |
4” O.D. |
3.0” O.D. |
3/4” NPT |
37 |
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ATI-310U-N |
Natural |
15,000 |
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190,000 |
0.82 |
5.0 |
10.5 |
8.0 |
20-1/2 |
13-4/5 |
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8-1/2 |
120 |
0.83 |
4” O.D. |
3.0” O.D. |
3/4” NPT |
37 |
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ATO-310U-N |
Natural |
15,000 |
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190,000 |
0.82 |
5.0 |
10.5 |
8.0 |
20-1/2 |
13-4/5 |
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8-1/2 |
120 |
0.83 |
4” O.D. |
3.0” O.D. |
3/4” NPT |
37 |
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ATI-510U-N |
Natural |
15,000 |
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199,000 |
0.82 |
5.0 |
10.5 |
10.0 |
20-1/2 |
13-4/5 |
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8-1/2 |
120 |
0.86 |
4” O.D. |
3.0” O.D. |
3/4” NPT |
39 |
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ATO-510U-N |
Natural |
15,000 |
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199,000 |
0.82 |
5.0 |
10.5 |
10.0 |
20-1/2 |
13-4/5 |
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8-1/2 |
120 |
0.86 |
4” O.D. |
3.0” O.D. |
3/4” NPT |
39 |
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All dimensions in inches.
15-150 psi water pressure. 40 psi or above recommended for maximum flow. * Category III required
**Current numbers based on factory testing, 0.4 GPM required for continuous fire after initial ignition.
Pressure only relief valve required (Min. 200,000 BTUs. 150 PSI). Min 50 PSI or above recommended for maximum flow. Complies with Ultra-Low NOx regulations (SCAQMD Rule 1146.2) effective January 1, 2012.
Freeze protection draws 1.1 AMP
Indoor models are certified from sea level to 8,000 ft. elevations.
INDOOR MODEL
Front view
13-3/4" (350 mm) |
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10" (254 mm) |
4 (101 mm) |
7" (180 mm) |
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3-5/8" (94 mm) |
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(58 mm) |
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1-3/8" (36 mm) |
20-1/4" (520mm) |
21/4"- |
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1-7/8" (47 mm) |
120 VAC 1-5/8" (40 mm) |
HOT 4-5/8" (116 mm) |
COLD 1-5/8" (41 mm) |
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GAS 5" (127 mm) |
Side view
4-3/8" (113 mm) |
19-3/8" (493 mm) |
1" (26 mm) |
120 VAC 3" (75 mm) |
GAS 5-1/4" (135 mm) |
COLD 6" (153 mm) |
HOT 6" (153 mm) |
9-1/2" (241 mm) |
CLEARANCES: Top 12”, Bottom 12”, Front 24”, Back 0.5”, Sides 2”
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 2 of 4
www.hotwater.com |
AOSBG45100 |
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