Brochure

TANKLESS MODELS
GROUND WATER
TEMPERATURE FACTOR
The temperature of incoming ground
water (cold water inlet temperature)
varies greatly throughout the U.S.
and also uctuates with the changing
of the seasons. The temperature
of water as it enters the water
heater will determine the amount
of “temperature rise” required to
achieve the desired hot water outlet
temperature (120°F is recommended).
The best way to measure incoming
ground water temperature is to use a
thermometer to measure cold water
temperature during the coldest season
of the year. To simplify the process, use
this map to determine whether your
installation location is in the Southern
Zone, Central Zone or Northern Zone.
PEAK HOT WATER DEMAND
The next step is to determine how
many gallons per minute of hot water
will be required during the busiest
usage period (peak demand). Consider
all appliances and xtures that use
hot water, including lavatory faucets,
kitchen faucets, washing machines,
dishwashers, showers and bathtubs.
Be sure to determine how many
appliances and xtures will be used at
the same time (peak demand).
Average Ground Water
Temperature: 62°F to 77°F
Average Ground Water
Temperature: 52°F to 61°F
Average Ground Water
Temperature: 37°F to 51°F
NORTHERN ZONESOUTHERN ZONE CENTRAL ZONE
Remember, these are general recommendations. Your A. O. Smith Water Heater Specialist can review your family’s needs in
even greater detail to make sure the model you choose will always provide enough hot water to meet the demand.
AVERAGE GROUND WATER TEMPERATURE
SIMPLE TANKLESS SIZING
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