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Installing a Vent
Improper venting of the water heater can result in excessive
levels of carbon monoxide, which can lead to severe
personal injury or death. This water heater must be vented in
Warning
accordance with the "Venting of Equipment" section of the
latest edition of the ANSI Z223.1/NFPA 54 Natural Fuel Gas
Code in the USA and/or the "Venting systems and air supply
for water heaters" section of the latest version of the CAN/CGA
B149.1 Natural Gas and Propane Installation Code in Canada,
as well as all applicable local building codes and regulations.
Follow all instructions and guidelines when venting the
water heater. Venting should be performed only by a licensed
professional.
The water heater must be properly vented to ensure a constant
supply of clean intake air and to ensure that exhaust air is properly
removed from living areas. When venting the water heater, follow
these guidelines:
•
Do not install the water heater in areas with contaminated air
(containing a high level of dust, sawdust, sand, flour aerosols,
or any other such airborne contaminants), as contaminants can
cause operational problems. The warranty does not cover damage
caused by contaminants in the installation area. If you must install
the water heater in an area with contaminated air, use direct
venting to supply air from outside the building. We recommend
regular filter cleaning and maintenance in these areas.
•
For best results, keep the venting system as short and straight
as possible.
•
Locate the water heater as close as possible to the vent
termination.
•
Do not connect the water heater vent to a vent for any other gas
water heater or vent stack.
•
For horizontal runs, slope the horizontal section upward toward
the vent termination at a rate of 1/4" per foot (2% slope).
•
Create an airtight seal at each joint in the exhaust and intake air
pipes from the water heater collar to the vent termination.
•
To avoid moisture and frost build-up and to maintain clearances
to openings on adjacent homes, 45° elbows, 90° elbows, or
tees may be attached to the end of the termination vent pipe
to direct the exhaust fumes away from buildings, as long as the
restrictions on total allowable vent lengths, maximum number
of elbows, and distances to air intake are observed.
•
Do not store hazardous or flammable substances near the vent
termination.
•
If this water heater is to be installed in an area where snow
is known to accumulate, protect the vent termination from
blockage.
•
Ensure that the vent termination is at least 12" (305mm) above
ground, or as required by local codes.
•
Support the vent pipe with hangers at regular intervals or as
required by local codes.
•
Exhaust and intake air pipes must be supported at least every 4
feet (1.2m).
•
The vent for this appliance shall not terminate over public
walkways; or near soffit vents or crawl space vents or where
condensate or vapor could create a nuisance or hazard or cause
property damage; or where condensate or vapor could cause
damage or could be detrimental to the operation of regulators,
relief valves, or other equipment.
22
Installation Manual
Vent Type
All water heaters are prepared at the factory to be direct
vent (sealed combustion) water heaters that draw all of their
required combustion air directly from outside the building. Vesta
recommends direct air vent installations whenever possible to avoid
back drafting cold air through the water heater. If you cannot use a
direct vent, ensure that an ample supply of make-up air is available
in the installation location. Vesta also recommends installing a new
vent system with this appliance. If reusing an existing vent system,
thoroughly inspect it for punctures, cracks, or blockages prior to
connecting it to the water heater.
Direct
The water heater uses 2" or 3" diameter exhaust and 2" or 3"
diameter intake air ducts. To ensure the draw of air directly from
and exhaust of air directly to the outside of the building, create an
airtight seal from the water heater collar to the vent termination.
Intake materials can be made of ABS, PVC, CPVC, PP, galvanized
steel, corrugated aluminum or any other similar materials. If you use
a corrugated material, ensure that there is not inadvertent crimping
of, or damage to, the intake air pipe.
When using direct venting, maintain the following venting
clearances, as required by ANSI Z21.10.3 and the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, and CAN/CGA B149.1 Natural Gas and
Propane Installation Code.
To use direct venting for the water heater:
•
Install the 2" vent directly. Ensure the vent is properly seated.
•
To install the 3" vent, reducer (3" to a 2") must be used.
3" Elbow
Reducer (3" → 2")
3" PVC Pipe
2" PVC Pipe
2" Elbow
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