A.O. Smith ATI-240H-N, ATI-240H-P, ATO-240H-N, ATO-240H-P Technical Documents

TANKLESS HIGH EFFICIENCY

®

CONDENSING MODELS

Residential/Commercial Gas
Tankless Water Heaters

ATI and

Ultra-Low NOx Gas Tankless Water Heaters with Condensing
Technology featuring an unprecedented 0.95 Energy Factor which
lowers operating costs and is environmentally friendly

FEATURES

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

INDOOR MODEL - INCLUDES
INTEGRATED TEMPERATURE
CONTROLS 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

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

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)

COMMON VENT UP TO 8 UNITS

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

PRODUCT PRESERVERS

®

ANTI-SCALE SYSTEM

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

ATO240-540H

INDOOR MODELS

OUTDOOR MODELS

540 model

only

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 6

www.hotwater.com Revised February 2014 AOSRG46835

Residential/Commercial Gas
Tankless Water Heaters

TANKLESS HIGH EFFICIENCY CONDENSING MODELS

MODEL

NUMBER

FUEL
TYPE

GAS CONSUMPTION

INPUT

MINIMUM

BTU/H

MAXIMUM

BTU/H

INLET GAS
PRESSURE

MINIMUM

W.C.

MAXIMUM

W.C.

ENERGY

FACTOR

MAX

GPM*

HOT/COLD

AND

GAS CONN.

DIMENSIONS IN INCHES

A

HEIGHTBWIDTHCDEPTH

INDOOR

ATI-240H-N Natural 15,000 160,000 5.0 10.5 0.95 6.6 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATI-240H-P Propane 13,000 160,000 8.0 14.0 0.95 6.6 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATI-340H-N Natural 15,000 180,000 5.0 10.5 0.95 8.0 3/4"NPT 23-5/8 17-3/4 11-1/4 58
ATI-340H-P Propane 13,000 180,000 8.0 14.0 0.95 8.0 3/4"NPT 23-5/8 17-3/4 11-1/4 58
ATI-540H-N Natural 15,000 199,000 5.0 10.5 0.95 10.0 3/4"NPT 23-5/8 17-3/4 11-1/4 59
ATI-540H-P Propane 13,000 199,000 8.0 14.0 0.95 10.0 3/4"NPT 23-5/8 17-3/4 11-1/4 59

OUTDOOR

ATO-240H-N Natural 15,000 160,000 5.0 10.5 0.95 6.6 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATO-240H-P Propane 13,000 160,000 8.0 14.0 0.95 6.6 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATO-340H-N Natural 15,000 180,000 5.0 10.5 0.95 8.0 3/4"NPT 23-5/8 17-3/4 11-1/4 58
ATO-340H-P Propane 13,000 180,000 8.0 14.0 0.95 8.0 3/4"NPT 23-5/8 17-3/4 11-1/4 58
ATO-540H-N Natural 15,000 199,000 5.0 10.5 0.95 10.0 3/4"NPT 23-5/8 17-3/4 11-1/4 59
ATO-540H-P Propane 13,000 199,000 8.0 14.0 0.95 10.0 3/4"NPT 23-5/8 17-3/4 11-1/4 59

All dimensions are in inches.
15-150 psi Water Pressure. 40 psi or above is recommended for maximum flow.
*Current numbers based on factory testing; 0.5 GPM for activation; 0.4 GPM required for continuous fire after initial ignition.
Indoor models are certified from sea level to 10,100 ft. elevations.
In accordance with ANSI Z21.10.3, CO emission does not exceed 400 PPM for normal input.
The manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligation.

UNIT

WEIGHT

(LBS)

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 2014

Page 2 of 6

AOSRG46835