Water Heater Water Heater 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
fluctuates 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 fixtures that use hot water, including lavatory faucets, kitchen faucets, washing
machines, dishwashers, showers and bathtubs. Be sure to determine how many appliances and fixtures will be used at the
same time (peak demand).
Remember, these are general recommendations. Your Takagi 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.
SIMPLE TANKLESS SIZING
Average Ground Water Temperature
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
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