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contaminated (see Table 2) it is imperative that the water heater be
installed as direct vent so that all combustion air is taken directly
from the outdoors into the water heater intake connection.
Unconfined space is space with volume greater than 50 cubic feet
per 1,000 BTU/hr (4.8 cubic meters per kW) of the total input rating of
all fuel-burning appliances installed in that space. Rooms connected
directly to this space through openings not furnished with doors are
considered part of the space. See Venting Section for details.
Confined space is space with volume less than 50 cubic feet per
1,000 BTU/hr (4.8 cubic meters per kW) of the total input rating of all
fuel-burning appliances installed in that space. Rooms connected
directly to this space through openings not furnished with doors are
considered part of the space.
When drawing combustion air from inside a conventionally
constructed building to a confined space, such space should be
provided with two permanent openings: one located 6" (15cm)
below the space ceiling, the other 6" (15cm) above the space floor.
Each opening should have a free area of one square inch per 1,000
BTU/hr (22cm
2
/kW) of the total input of all appliances in the space,
but not less than 100 square inches (645cm
If the confined space is within a building of tight construction, air for
combustion must be obtained from the outdoors as outlined in the
Venting section of this manual.
When drawing combustion air from the outside into the
mechanical room, care must be taken to provide adequate freeze
protection.
Failure to provide an adequate supply of fresh combustion air can
cause poisonous flue gases to enter the living space, resulting
in severe personal injury or death. To prevent combustion air
contamination, see Table 2.
F. Carbon Monoxide Detectors
In the Commonwealth of Massachusetts and As Required by
State and Local Codes:
Installation of Carbon Monoxide Detectors: At the time of installation
or replacement of the vented gas fueled appliance, the installing
plumber or gas fitter shall observe that a hard wired carbon
monoxide detector with an alarm and battery back-up is installed
on the floor level where the gas appliance is installed, unless the
appliance is located in a detached, uninhabitable structure separate
from the dwelling, building, or structure used in whole or in part for
residential purposes.
In addition, the installing plumber or gas fitter shall observe that a
hard wired carbon monoxide detector with an alarm and battery
back-up is installed on each additional level of the dwelling,
building, or structure served by the vented gas appliance. It shall
be the responsibility of the property owner to secure the service
of qualified licensed professionals for the installation of hard wired
carbon monoxide detectors.
a. In the event that the vented gas fueled appliance is installed in
a crawl space or attic, the hard wired carbon monoxide detector
with alarm and battery back-up shall be installed on the next
adjacent floor level.
b. In the event that these requirements cannot be met at the time
of completion of installation, the owner shall have a period of
thirty (30) days to comply with the above requirements; provided,
however, that during said thirty (30) day period, a battery operated
carbon monoxide detector with an alarm shall be installed.
Do not attempt to vent this water heater by any means other than
those described in this manual. Doing so will void the warranty
and may result in severe personal injury or death.
Approved Carbon Monoxide Detectors: Each carbon monoxide
detector as required in accordance with the above provisions shall
comply with NFPA 70 and be ANSI/UL 2034 listed and IAS certified.
G. Prevent Combustion Air Contamination
Install intake air piping for the heater as described in the Venting
Section, this manual. Do not terminate exhaust in locations that can
allow contamination of intake air.
Ensure that the intake air will not contain any of the contaminants
in Table 2. Contaminated air will damage the heater, resulting in
possible substantial property damage, severe personal injury, or
death. For example, do not pipe intake air near a swimming pool or
laundry facilities. These areas always contain contaminants.
Spray cans containing fluorocarbons
2
).
Permanent wave solutions
Chlorinated waxes / cleaners
Chlorine-based swimming pool chem-
icals
Calcium chloride used for thawing
Sodium chloride used for water
softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric or Muriatic acid
Cements and glues
Antistatic fabric softeners used in
clothes dryers
Chlorine-type
detergents, and cleaning solvents
Adhesives used to fasten building
products
Table 2 - Products and Areas Likely to Have Contaminants
NOTE: DAMAGE TO THE HEATER CAUSED BY EXPOSURE TO
CORROSIVE VAPORS IS NOT COVERED BY WARRANTY. (Refer to
the limited warranty for complete terms and conditions.)
H. Removing a Heater from a Common Vent System
Do not install the heater into a common vent with any other
appliance. This will cause flue gas spillage or appliance malfunction,
resulting in possible substantial property damage, severe personal
injury, or death.
Failure to follow all instructions can result in flue gas spillage and
carbon monoxide emissions, causing severe personal injury or death.
When removing an existing heater, follow the steps below.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and horizontal
pitch to determine if there is blockage, leakage, corrosion, or other
deficiencies that could cause an unsafe condition.
3. If practical, close all building doors, windows, and doors between the
space in which the water heater remains connected to the common
venting system and other spaces in the building. Turn on clothes
dryers and any appliances not connected to the common venting
system. Turn on any exhaust fans, such as range hoods and bathroom
Areas
Products to Avoid
Dry cleaning / laundry areas and
establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and es-
tablishments
New building construction
Remodeling areas
bleaches,
laundry
Garages and workshops
WHL-001 Rev. 001 Rel. 008 Date 8.23.18
9
Likely
to
Have
Contaminants
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