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Activity
F | Sizing
Meeting temperature rise (ability to heat water to set/desired output temperature) for an
electric tankless water heater is dependent on the climate/region where a heater is installed.
Colder incoming water requires a larger kilowatt model. The same applies for flow rate. To meet
the demand for higher flow rates, a higher kilowatt model is needed. There are 3 pieces of
information needed to determine what size electric tankless water heater is right for you.
Watts: Amount of energy needed to heat water to meet set/desired temperature
Temperature Rise: Difference between inlet water temperature and set/desired outlet
temperature
Flow Rate: Measured in gallons per minute (GPM)
The chart below will assist in selecting the correct model based on your location.
Certified through the ETL Nationally Recognized Testing Laboratory to UL 499 and CSA.