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I
Venting:
A
WARN I N G
Improper venting of water heater can result in excessive levels of carbon monoxide
which can result in severe personal injury or death. This water heater must be
vented in accordance with the "Venting of Equipment" section of the latest edition of
the ANSI 2223. 1 / NFPA 54 Natural Fuel Gas Code and/or the "Venting systems
and air supply for appliances" section of the latest version of the CAN/CGA 8 1 49. 1
Natural Gas and Propane Installation Code in Canada and in accordance with all
applicable local building codes.
A
WARN I N G
This Navien water heater can be vented with plastic or stainless steel.
can be used in all cases EXCEPT when the incoming or recirculation return water
temperatures exceed 1 60
°
higher than 1 60
F (70
combination heating system, you M UST use the Navien stainless steel venting or
any 3" venting system approved for use with Category IV appliances (typically Type
BH Special Gas Vent approved to UL 1 738-8636).
� For best results, keep the vent system as short and straight as possible;
� Locate the water heater as close as possible to the vent terminator;
� The water heater vent must not be common vented with any other gas appliance or
vent stack;
� Slope the vent upwards toward the vent terminal at a rate of %'' per foot (2% slope);
� When sloping the vent using any other manufacturer's stainless steel vent, the
assembly of the vent pipe must be such that it is male-to-female in the direction of
the flow of condensate.
� The exhaust vent and air-intake vent pipes must be sealed air tight at each joint from
flue collar to terminator;
� Make sure that the seam of the vent pipe in horizontal runs is toward the top of the
installation;
� Do not downsize the vent pipe.
°
°
F (70
C).
IF you set the water heater at a temperature
°
C) AND are running an external recirculation loop or a
Venti ng Gu idel i nes
Plastic vent
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