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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*
(MPa)
Natural gas
" W.C.
Inlet Pressure
Propane
" W.C.
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.
NOTICE
The 240HX3/340HX3/540HX3 models do not have Easy-Link or Multi-Unit capability.
240HX3
240HX3
Indoor
Outdoor
(AT-H3J-DV-
(AT-H3J-OS-
SCM)
Min.: 15,000
Max.: 160,000
Min.: 13,000
Max.: 160,000
psi
(kPa)
(kPa)
lbs.
60
(kg)
(27.4)
inch
mm
W/A
72.7 / 0.61
W/A
3.1 / 0.03
W/A
IV
340HX3
Indoor
(AT-H3S-DV-
(AT-H3S-OS-
SCM)
SCM)
Min.: 15,000
Max.: 180,000
Min.: 13,000
Max.: 180,000
3/4" NPT
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)
60
60
(27.1)
(27.4)
22.4 x 17.7 x 10.7
570 x 450 x 272
Electric Ignition
120/60
78.2 / 0.65
3.1 / 0.03
197/1.7
N/A
IV
4
Page
Installation Manual
Specifications
340HX3
540HX3
Outdoor
Indoor
(AT-H3-DV-
SCM)
SCM)
Min.: 15,000
Max.: 199,000
Min.: 13,000
Max.: 199,000
60
62
(27.1)
(27.9)
89.0 / 0.74
4.2 / 0.04
N/A
IV
540HX3
Outdoor
(AT-H3-OS-
SCM)
61
(27.6)
N/A
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