A.O. Smith ATO-340H-P Technical Documents | Page 2

A.O. Smith Water Heater Technical Documents - ATO-340H-P.
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Residential/Commercial Gas
Tankless Water Heaters

Page 2 of 6

AOSRG46835

For Technical Information call 1-877-737-2840. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.

TANKLESS HIGH EFFICIENCY CONDENSING MODELS

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; 0.4 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.

MODEL

NUMBER

FUEL
TYPE

GAS CONSUMPTION

INPUT

INLET GAS

PRESSURE

ENERGY

FACTOR

MAX

GPM*

HOT/COLD

AND

GAS CONN.

DIMENSIONS IN INCHES

UNIT

WEIGHT

(LBS)

MINIMUM

BTU/H

MAXIMUM

BTU/H

MINIMUM

W.C.

MAXIMUM

W.C.

A

HEIGHT

B

WIDTH

C

DEPTH

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

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