INS
TALLA
TION
22
On-Demand Water Heater Installation Manual and Owner’s Guide
❶ ABS, PVC, CPVC or polypropylene vent
The Indoor model can be vented with ABS, PVC, CPVC, or polypropylene (temperature rated up to 149°F). In Canada,
plastic venting must be certified to ULC S636 standards.
• The maximum length of exhaust vent piping must not exceed 60 ft (18.3 m) for 2" venting or 150 ft (45.7
m) for 3" venting. The minimum venting length is one street 90° with a sidewall vent termination
• Do not use more than 5 elbows in a vent system. A 2" elbow and 3" elbow are equivalent to a vent length
of 5 ft (1.5 m). If an elbow(s) is used in the vent system, deduct each equivalent length from the Max. vent
length to decide the total vent length.
• When the horizontal vent run exceeds 5 ft (1.5 m), support the vent run at 3 ft (0.9 m) intervals with over-
head hangers.
• In areas of high rainfall the installation of the rain trap may be necessary.
• Slope horizontal venting sections 1/4"upwards for every 12" (300 mm) toward the termination or according
to local and state codes, or in the absence of local or state codes, the current edition of the National Fuel
Gas Code, ANSI Z223.1 (NFPA 54).
Item
Material
United States
Canada
Exhaust pipe and
Fittings
Schedule 40 PVC
ANSI/ASTM D1785
ULC S636 Certified
Materials Only
PVC-DWV
ANSI/ASTM D2665
Schedule 40 CPVC
ANSI/ASTM F441
Schedule 40 ABS-DWV
ANSI/ASTM D2661
Polypropylene
UL-1738
Pipe Cement/Primer
PVC
ANSI/ASTM D2564
CPVC
ANSI/ASTM F493
ABS
ANSI/ASTM D2235
Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel® (polyphenylsulfone) in non-metallic venting
systems is prohibited.
Covering non-metallic vent pipe and fittings with thermal insulation is prohibited.
INSTALLATION
Step 7:
Exhaust vent for indoor installation
Step 7:
Exhaust vent for indoor installation
No. of
Elbows
Max. Vertical or Horizontal (Total) Vent Length
2" venting
3" venting
0 to 10,100 ft
(0 to 3,078 m)
0 to 10,100 ft
(0 to 3,078 m)
0
60 ft (18.3 m)
150 ft (45.7 m)
1
55 ft (16.8 m)
145 ft (44.2 m)
2
50 ft (15.2 m)
140 ft (42.7 m)
3
45 ft (13.7 m)
135 ft (41.1 m)
4
40 ft (12.2 m)
130 ft (39.6 m)
5
35 ft (10.7 m)
125 ft (38.1 m)
Excludes vent terminators, termination elbows, or rain caps.
For details on the vent connection, refer to pp. 15, 23 to 24.
For each elbow added, deduct 5 ft (1.5 m) length for the elbow from max. vent length.
Approved vent and air intake Polypropylene vent materials: Centrotherm InnoFlue® Single Wall Vent System
Summary of Contents for 160X3P
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