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SPECIFICATIONS
Model
Natural Gas Input
BTU/h
(Operating Range)
Propane Input
BTU/h
(Operating Range)
Gas Connection
Water Connections
Water Pressure*
Natural gas
Inlet Pressure
Propane
Inlet Pressure
Weight
Dimensions
(HxWxD)
Ignition
VAC/Hz
Supply
Operation
Standby
Freeze-
Protection
Water heater category**
*40 psi or above is recommended for maximum flow.
**Water heater Category — water heaters of other than direct vent type, for outdoor installation, are divided into four categories
based on static pressure produced in the vent and flue loss.
Category IV - a water heater that operates with a positive vent static pressure and with a vent gas temperature that may
cause excessive condensate production in the vent.
NOTE:
• Check the rating plate to ensure that this product matches your specifications.
• The manufacturer reserves the right to discontinue, or change at any time, specifications or designs with-
out notice and without incurring obligation.
140H
140H
Indoor
Outdoor
(AT-H3M
(AT-H3M
-DV)
-OS)
Min.: 15,000
Max.: 120,000
Min.: 15,000
Max.: 120,000
1/2" NPT
psi
(MPa)
" W.C.
(kPa)
" W.C.
(kPa)
lbs.
50
50
(22.5)
(22.5)
(kg)
inch
21.7 x 13.9 x 9.3
mm
552 x 352 x 236
53.9 / 0.7
W/A
3.2 / 0.05
W/A
223.9 / 1.94
W/A
IV
N/A
240H
240H
340H
Indoor
Outdoor
Indoor
(AT-H3J
(AT-H3J
(AT-H3S
-DV)
-OS)
-DV)
Min.: 15,000
Min.: 15,000
Max.: 160,000
Max.: 180,000
Min.: 13,000
Min.: 13,000
Max.: 160,000
Max.: 180,000
3/4" NPT
15 - 150
(0.1 - 1)
Min. 4.0 (1.00)
Max. 10.5 (2.61)
Min. 8.0 (1.99)
Max. 14.0 (3.48)
58
58
58
(26.3)
(26.2)
(26.3)
22.4 x 17.7 x 10.7
570 x 450 x 272
Electric Ignition
120/60
72.7 / 0.61
3.1 / 0.03
174 / 1.5
IV
N/A
IV
4
Page
Installation Manual
Specifications
340H
540H
Outdoor
Indoor
(AT-H3S
(AT-H3
-OS)
-DV)
Min.: 15,000
Max.: 199,000
Min.: 13,000
Max.: 199,000
3/4" NPT
58
59
(26.2)
(26.8)
78.2 / 0.65
89.0 / 0.74
3.1 / 0.03
4.2 / 0.04
174 / 1.5
175 / 1.5
N/A
IV
540H
Outdoor
(AT-H3
-OS)
59
(26.9)
N/A
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