A.O. Smith ATO-340H-P Technical Documents | Page 2
Residential/Commercial Gas
Tankless Water Heaters
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.
Models are certified from sea level to 10,100 ft. elevations.
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
ATI-240H-N
Natural
15,000
160,000
5.0
10.5
0.95
6.6
3/4” NPT
22-1/2
17-3/4
10-3/4
58
ATI-240H-P
Propane
13,000
160,000
8.0
14.0
0.95
6.6
3/4” NPT
22-1/2
17-3/4
10-3/4
58
ATI-340H-N
Natural
15,000
180,000
5.0
10.5
0.95
8.0
3/4"NPT
22-1/2
17-3/4
10-3/4
58
ATI-340H-P
Propane
13,000
180,000
8.0
14.0
0.95
8.0
3/4"NPT
22-1/2
17-3/4
10-3/4
58
ATI-540H-N
Natural
15,000
199,000
5.0
10.5
0.95
10.0
3/4"NPT
22-1/2
17-3/4
10-3/4
59
ATI-540H-P
Propane
13,000
199,000
8.0
14.0
0.95
10.0
3/4"NPT
22-1/2
17-3/4
10-3/4
59
AOSRG46835 Condensing ULN Tankless Spec :Layout 1 9/11/12 11:25 AM Page 2
Residential/Commercial Gas
Tankless Water Heaters
Page 3 of 6
CANRG46835
For Technical Information call 1-888-599-2837. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
7-
7/
8"
(1
99
m
m
)
G
A
S
5-
1/
8"
(1
31
m
m
)
CO
LD
6-
3/
4"
(1
72
m
m
)
H
O
T
5-
1/
2"
(1
40
m
m
)
7-1/2" (189 mm)
GAS 5-7/8" (147 mm)
Condensate drain port
COLD 5/8" (17 mm)
HOT 4-3/4" (120 mm)
17-5/8" (448 mm)
6-1/4" (159 mm)
5-
3/
4"
(1
47
m
m
)
120 VAC 3" (77 mm)
12
0
VA
C
6-
7/
8"
(1
74
m
m
)
Drain port
Female
10-3/4" (272mm)
22
-1
/2
"
(5
70
m
m
)
Co
nd
en
sa
te
dr
ai
n
po
rt
4" (102 mm)
2-
5/
8"
(6
8
m
m
)
Ex
ha
us
t
In
ta
ke
Female
7-7/8" (199 mm)
7-1/2" (189 mm)
7" (180 mm)
4" (101 mm)
17-3/4" (450 mm)
HOT 4-3/4" (120 mm)
6-3/4" (170 mm)
COLD 5/8" (17 mm)
GAS 5-3/4" (147 mm)
Condensate drain port
23
-5
/8
"
(6
00
m
m
)
2-
5/
8"
(6
5
m
m
)
5-3/4" (147 mm)
11-1/4" (285 mm)
1/2 (13 mm)
GAS 5-1/8" (131 mm)
HOT 5-1/2" (140 mm)
COLD 6-3/4" (172 mm)
Condensate drain port
6-1/4" (159mm)
4" (102 mm)
24
-7
/8
"
(6
31
m
m
)
120 VAC 3" (77 mm)
Drain port 6" (152 mm)
120 VAC 6-7/8" (174 mm)
INDOOR MODEL
AOSRG46835 Condensing ULN Tankless Spec :Layout 1 9/11/12 11:25 AM Page 3
Residential/Commercial Gas
Tankless Water Heaters
FLOW RATE vs TEMPERATURE RISE
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
0
20
40
60
80
100
120
140
Fl
ow
R
at
e
(G
P
M
)
Temperature Rise (˚F)
Set temperature 125˚F (52˚C) or lower
Set temperature 130˚F (55˚C) or higher
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
0
20
40
60
80
100
Fl
ow
R
at
e
(G
P
M
)
540H
240H
340H
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
0
20
40
60
80
100
Fl
ow
R
at
e
(G
P
M
)
Flow Rate vs. Temperature Rise
Flow Rate vs. Temperature Rise
Temperature Rise (°F)
Flow Rate vs. Temperature Rise
Temperature Rise (°F)
Temperature Rise (°F)
AOSRG46835 Condensing ULN Tankless Spec :Layout 1 9/11/12 11:25 AM Page 5
Residential/Commercial Gas
Tankless Water Heaters
FLOW RATE vs TEMPERATURE RISE
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
0
20
40
60
80
100
120
140
Fl
ow
R
at
e
(G
P
M
)
Temperature Rise (˚F)
Set temperature 125˚F (52˚C) or lower
Set temperature 130˚F (55˚C) or higher
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
0
20
40
60
80
100
Fl
ow
R
at
e
(G
P
M
)
540H
240H
340H
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
0
20
40
60
80
100
Fl
ow
R
at
e
(G
P
M
)
Flow Rate vs. Temperature Rise
Flow Rate vs. Temperature Rise
Temperature Rise (°F)
Flow Rate vs. Temperature Rise
Temperature Rise (°F)
Temperature Rise (°F)
AOSRG46835 Condensing ULN Tankless Spec :Layout 1 9/11/12 11:25 AM Page 5
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