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MODEL SELECTION GUIDE.
1 305 or 505 305 or 505 305 or 505
2 305 or 505 305 or 505 305 or 505
3 505 or 705 (2) 505 or 705 (2) 505
4 (2) 505 (2) 505 (2) 505
5 (2) 505 (2) 705 (2) 705
6 or more Multi-system Multi-system Multi-system
* Note: This Selection Guide is based on 120° F outlet water temperature.
Ground water
temperature factor.
The temperature of incoming ground
water (cold water inlet temperature)
varies greatly throughout the U.S. and
also fluctuates with change of season.
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 your incoming
ground water temperature is to use a
thermometer to measure cold water tem-
perature 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 much
hot water will be required during its
busiest usage period (“peak demand”).
To use the chart, consider all appliances
and fixtures that use hot water, including
lavatory faucets, kitchen faucets, washing
machines, dishwashers, showers and bath-
tubs. Be sure to determine how
many appliances and fixtures will be used
at the same time during peak demand.
Average Ground Water Temperatures
SOUTHERN ZONE
Average Ground Water
Temperature: 62°F to 77°F
CENTRAL ZONE
Average Ground Water
Temperature: 52°F to 61°F
NORTHERN ZONE
Average Ground Water
Temperature: 37°F to 51°F
Ground Water Temperature Zone
Appliances or fixtures
in simultaneous use
during peak demand
Southern Zone Central Zone Northern Zone