Technical Support

Ohm's Law

To Determine: For Single Phase - Calculate: For Three Phase - Calculate:
AMPS =  WATTS =  VOLTS =   Amperage

Many local electrical codes and good engineering practices limit line current to 48 amps. When this total heater total heater limit is exceeded, Warren Electric heaters are designed with multiple circuits which limit the line current below 48 amps per circuit. Please consult factory to discuss other options. Determining Line Current = "I" (amperes)
Single Phase: Three Phase: Determining Required Power

Power (KW) = FR = Flow rate in Gallons Per Hour (static reservoirs use gallon capacity) In a Circulating System this is the Actual Flow Rate During Operation
gc = Specific Gravity of Fluid/Gas
CP = Specific Heat of Fluid/Gas (BTU/(lb. °F))
DT = Differential Between Outlet Temperature and Inlet Temperature (°F)
SF = Safety Factor (typically 20%) SF = 1.2
8.34 = Weight of water per gallon (lb./Gal)

Wattage Differential

When heaters are operated at voltages other than the design voltage, different power outputs will result. It is acceptable to use Warren Electric heaters up to 10% above the design voltage and any percentage below. (Note: Applied voltage will affect the power output as shown below.)   Determining Actual Power Output: Warren Electric heaters are normally range rated (showing the recommended maximum and minimum applied voltage and corresponding wattage). The table below shows the standard Warren Electric ranges as they apply.
Design Voltage Nameplate Voltage Nameplate Wattage
120
240
480
550
110-120
220-240
440-480
550-575
Corresponds to the output wattage at nameplate voltage