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,
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” 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
Maintain the following clearances to any combustible surface in an indoor installation:
Indoor Clearances
Piping side | 6” |
Front (Maintenance | Suggested 24” |
space) | 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.
Indoors | Outdoors |
Min. 3"
Min. 32"
Min. 3"
