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11
Exhaust Venting
This water heater must be vented in accordance
with the section on venting of equipment in the
latest edition of the National Fuel Gas Code.
This is a Category III appliance, and must be
vented accordingly. The following are UL listed
manufacturers: ProTech Systems FasNSeal, Z-
Flex Inc. Z-Vent II and Heat-Fab Inc. Saf-T Vent.
This unit requires 4” vent pipe. Connect the vent
pipe to the unit so that it is sealed airtight. Follow
the vent pipe manufacturer’s instructions when
installing the vent pipe. Do not common vent this
appliance with any other vented appliance.
The venting system must not exceed a length of
35 ft. minus 5 ft. for every elbow. Do not use more
than 3 elbows.
No. of Elbows Max. Vertical or
Horizontal Length
0 35 ft.
1 30 ft.
2 25 ft.
3 20 ft.
If the horizontal vent run exceeds 5 ft., the
following criteria must be observed:
• There must be a 2 ft. vertical run off the top
of the heater before the horizontal run
begins.
• The horizontal run must be supported at 3’
intervals.
• The vent run should be pitched up towards
the termination at ¼” per foot.
The unit can be vented either up and out the roof,
or directly through a wall. If the unit will be vented
through a wall, use Takagi USA Inc. optional part,
the TK-TV01 vent terminator, or an equal Category
III vent part. Locate the vent terminator according
to ANSI Z223.1/NFPA 54 and applicable local
codes.
Maintain the following clearances to any
combustible surface in an indoor installation:
Indoor Clearances
Piping side 6”
Front (Maintenance
space)
Suggested 24”
Min. 4”
Floor
Noncombustible base
Back of heater 1”
Non piping side 2”
Top of heater 12”
Manufactured Home (Mobile Home)
Installation
This appliance must be installed in accordance
with the Manufactured Home Construction and
Safety Standard, (Title 24, CFR; Part 3280) and
ANSI A119.5/NFPA 501D. In addition, install in
accordance with the following instructions, the
instructions supplied with any venting, local codes,
utility company requirements for the installation of
water heaters in manufactured homes (mobile
homes), and the latest edition of the National Fuel
Gas Code, ANSI Z221.3/NFPA 50.
Locate the heater in an enclosure separating the
unit from the internal atmosphere of the
manufactured home or trailer. All combustion air
must be obtained from the outside atmosphere,
and the flue gases must be discharged directly
outdoors through a gas vent. There must be no
opening from the interior of the home or trailer into
the water heater enclosure.
Indoor Installation
Follow indoor installation instructions as set out in
an earlier section of this manual, except that
combustion air must not be taken from the inside
of the home or trailer.
Outdoor Installation
Follow outdoor installation instructions as set out in
an earlier section of this manual.
If the unit is to be installed in a recessed area,
connect a gas vent to the unit, which will direct
exhaust gases out of the recessed area.
Min. 32"
Min. 3"
Indoors Outdoors
Min. 3"