Gas Water Heater Installation
28
For installation in Canada, field supplied plastic vent piping must comply with CAN/CGA
B149 1(latest edition)and be certified to the Standard For Type BH Gas Venting
Systems, ULC S636 Components of this listed system shall not be interchanged with
other vent systems or unlisted pipe/fittings. All plastic components and specified primers
and glues of the certified vent system must be from a single system manufacturer and
not intermixed with other system manufacturer
’s vent system parts. The supplied vent
connector and vent termination are certified as part of the Water Heater.
█
Venting:
Do not operate the Water Heater in an area that is or will be under construction or renovation.
Do not install the water heater in an area with contaminated air (containing a high level of dust,
sawdust, sand, flour, aerosols or any other such airborne contaminants) as those contaminants
will cause operational problems.
The Navien warranty will not cover damage caused by installation in a contaminated
environment.
To minimize operational problems, direct venting (sealed combustion) must be used such that
contaminant free combustion air will be supplied directly from outside. Even with direct venting,
regular filter cleaning and maintenance is recommended for these types of environments.
Venting requirements in USA and Canada are different. Please consult the chart below and the
most recent edition of the National Fuel Gas Code (ANSI Z223.1 / NFPA 54) or CAN/CGA B-
149.1 as well as local codes for applicable venting regulations and restrictions.
All Navien Water Heaters are Category IV appliances;
Navien Recommended Vent Materials
Model Type
USA
CANADA
NR-180, NR -180A
NR -210, NR -210A
NR -240, NR -240A
PVC Schedule 40**
ABS Schedule 40(SOLID CORE)**
CPVC Schedule 80**
Type BH Special Gas Vent
Class IIA (PVC)**
NP-180, NP-180A
NP-210, NP-210A
NP-240, NP-240A
PVC Schedule 40**
ABS Schedule 40**
CPVC Schedule 80**
Navien’s Stainless Steel Vent
Kit or
Type BH Special Gas Vent
Class IIB (PVC)**
**NOTE: Plastic vent can be used in all cases
EXCEPT
when the incoming (or recirculation return)
water temperatures exceed 160
°
F (70
°
C).
IF
you set the water heater at a temperature higher than
160
°
F (70
°
C)
AND
you are running an external recirculation loop or a combination heating system,
you
MUST
use Plastic venting(CPVC Sch80)
or any 3” venting system approved for use with
Category IV appliances (typically Type BH Special Gas Vent approved to UL1738-S636)**
Navien does NOT recommend the use of cellular core ABS as venting on any of its products.
When using stainless steel BH type gas vent, the exhaust vent system must be sealed air tight and
must be male-to-female in the direction of the flow of condensate. Follow the vent pipe
manufacturer’s certified installation instructions.
VENTING
A New requirement for Canada
