A.O. Smith ATO-110-N Technical Documents
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
COMPLIES WITH LEAD FREE STANDARDS
HEAT EXCHANGER (510 MODELS) IS CONSTRUCTED OF COMMERCIAL-
GRADE 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
INDOOR MODELS
ATI-110, ATI-310, ATI-510
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
510 models
AOSBG45201 Tankless Spec Sheet_AOS Effex Res HE Spec Sheet 8/19/14 1:20 PM Page 1
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