other approved, noncombustible, corrosion-
resistant material. 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.
When installing the vent system, all applicable
national and local codes must be followed. If
you install thimbles, fire stops or other
protective devices, and they penetrate any
combustible or noncombustible construction,
be sure to follow all applicable national and
local codes.
Fan assisted appliances should follow the
requirement as indicated in the latest edition of
ANSI Z233.1/NFPA 54.
The entire vent system must not exceed the
size specified in table below.
Diam
eter
Max.
No. of
Elbow
Max. Vertical or
Horizontal run in
Length
4” 3
Ea.
35
ft
For each elbow added, deduct 5 ft. from
max. Vent length.
No. of Elbows
Max. Vertical or
Horizontal Length
0 35
ft.
1 30
ft.
2 25
ft.
3 20
ft.
When the horizontal vent run exceeds 5 ft. the
following criteria must be observed;
•
Attach a vertical pipe at least 2” high to the
water heater outlet before the horizontal
run.
•
Support the vent run at 3 ft intervals with
overhead hanger.
•
Pitch up the vent run toward the vent
terminal at a rate of 1/ 4” per foot.
Indoor installation clearance.
Piping side (Bottom of water
heater)
Min. 12”
Front (Maintenance space)
Max. 24”
Min. 4”
Back of heater
1”
Non piping sides (Side of
water heater)
Min. 1”
Top of heater
12"
Vent Termination
A sidewall vent terminal must be used when
the water heater is vented through a sidewall.
Manufacture's recommend to use Takagi -
USA parts No.TK-TV01 as a vent terminator.
The vent terminal provides a means of
installing vent pipe through the building wall
and must be located in accordance with ANSI
Z223.1/NFPA 54, or in Canada CAN/CGA-
B149 and local applicable codes.
Locate the vent terminal so that it cannot be
blocked by snow. Most codes require that
termination be at least 12 inches above grade,
but the installer may determine if it should be
higher depending on job site condition and
applicable city code.
