lp-672 Rev. 000 Rel. 002 Date 10.3.18
28
C. Water Heater Exhaust Vent and Intake Notes
1. Ensure the water heater is located where it will not be exposed to
prevailing winds.
2. Do not locate water heater over public walkways, driveways, or
parking lots. Condensate could drip and freeze, resulting in a slip
hazard or damage to vehicles and machinery.
3. Moisture build-up may be created in certain installation locations.
To save time and cost, carefully consider water heater installation
location.
4. The water heater must be installed where vapors cannot make
accidental contact with people or pets, or damage shrubs or plants.
5. Do not use the water heater as a shelf or to support any weight.
6. Maximum Snow Level Determination: These installation instructions
reference snow levels in establishing a minimum height for the
installation of the water heater. Snow levels shall be determined as
follows:
a. The installation location may, by ordinance, designate how snow
levels are calculated in that location; or
b. In the absence of specific ordinances, snow levels shall be calculated
from the average monthly maximum depth of snow accumulation as
indicated by the National Weather Service’s 10 year statistics for the
installation location/geographical area.
In addition:
•
The flue products from the exhaust vent will create a large plume
when the heater is in operation. Avoid venting in areas that will
affect neighboring buildings or be considered objectionable.
•
DO NOT locate the water heater in a parking area where it may
be damaged by machinery.
•
DO NOT vent near soffit vents, crawl space vents, or other areas
where condensate or vapor could create a nuisance or hazard or
cause property damage.
•
DO NOT vent where condensate vapor could cause damage or
could be detrimental to the operation of regulators, relief valve,
or other equipment.
In the Commonwealth of Massachusetts and as Required by State
and Local Codes:
•
The vented gas fueled appliance shall not be installed so its
combustion, ventilation, or dilution air is obtained from a
bedroom or bathroom.
•
Signage: Whenever any water heater is installed less than seven
feet above the finished grade, a metal or plastic identification
plate shall be permanently mounted to the exterior of the
building at a minimum height of eight feet above grade directly
in line with the exhaust vent terminal. The sign shall read, in print
no less than 0.5 inches in size, “GAS VENT DIRECTLY BELOW. KEEP
CLEAR OF ALL OBSTRUCTIONS”.
D. Application
Combustion air must be drawn from the outdoors directly into the
water heater intake, and exhaust must terminate safely outside. DO
NOT INSTALL THIS WATER HEATER INDOORS.
Be sure to locate the heater such that the exhaust vent and intake are
properly terminated. See Figure 23 and Table 13 for more information.
Care must be taken to utilize uncontaminated combustion air.
NOTE:
To prevent combustion air contamination, see Table 8.
