A.O. Smith ATI-540H-N Technical Documents
Residential/Commercial Gas
Tankless Water Heaters
FEATURES
ULTRA-LOW NOx CONDENSING TECHNOLOGY PROVIDES UNPRECEDENTED
0.95 ENERGY FACTOR
DURABLE HEAT EXCHANGER
■ Primary Heat Exchanger is constructed of HRS35, a Commercial-Grade Copper that is more
resilient to erosion. HRS35 is 25x better at heat transfer than stainless steel thus stabilizing
outgoing water temperatures quicker
■ Secondary Heat Exchanger is made of Type 316L Stainless Steel to protect against corrosion
CONTINUOUS MAXIMUM FLOW RATES UP TO 10.0 GPM
ENERGY STAR® QUALIFIED
AVAILABLE IN NATURAL GAS OR PROPANE (LP)
ATI 540H & AT0 540H CAN BE USED IN BOTH RESIDENTIAL AND
COMMERCIAL APPLICATIONS
ELECTRONIC IGNITION - NO PILOT LIGHT
INDOOR MODEL - INCLUDES A BUILT-IN TEMPERATURE CONTROLLER AND
ADVANCED DIAGNOSTICS TO SIMPLIFY TROUBLESHOOTING
OUTDOOR MODEL - INCLUDES A WALL MOUNT TEMPERATURE REMOTE
CONTROLLER AND ADVANCED DIAGNOSTICS TO SIMPLIFY TROUBLESHOOTING
FACTORY-INSTALLED POWER CORD INCLUDED FOR INDOOR MODELS
EASY-LINK UP TO 4 UNITS (540H MODELS ONLY)
■ With no additional parts or accessories needed
MULTI-LINK UP TO 20 UNITS (540H MODELS ONLY)
COMPLIES WITH LEAD FREE STANDARDS
SAFETY FEATURES:
■ Air-Fuel Ratio (AFR) Sensor
■ Exhaust & Water Temperature Safety Control
■ Overheat Cut-Off Fuse
INTERNAL FREEZE PROTECTION SYSTEM
POWER DIRECT VENT DESIGN
■ Exhaust, 3" PVC Venting up to 70 Feet or 4" PVC Venting up to 100 Feet
■ Provides flexible venting with PVC, CPVC, or ABS Pipe for Intake and Exhaust (solid core
only). Canadian Installations Require ULCS636 Listed PVC or CPVC Pipe for Venting.
■ Category IV Stainless Steel venting can also be used
ACCESSORIES
■ Pipe Cover
■ Neutralizer Kit
■ Isolation Valve Kits
■ Concentric Termination
WARRANTY
■ 15-year limited warranty on heat exchanger in residential applications
■ 10-year limited warranty on heat exchanger in commercial applications
■ 5-year limited warranty on all parts
INDOOR MODELS
ATI-240H, ATI-340H, ATI-540H
OUTDOOR MODELS
ATO-240H, ATO-340H, ATO-540H
ANSI Z21.10.3
CSA 4.3
Page 1 of 6
AOSRG46835
TANKLESS HIGH EFFICIENCY
CONDENSING MODELS
®
540 model
only
Revised March 2013
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