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