Institutional electric convector heaters come in a variety of wattage and voltage options for your convenience. The wattage of convection heater refers to the amount of energy that is required to heat up. The voltage amount, however, is the amount of power needed to run the equipment. Follow this chart for a voltage to wattage chart: Voltage Wattage 120 volts 400 watts 240 volts 400 watts 208 volts  750 watts  277 volts 750 watts 208 volts 1000 watts 240 volts 1250 watts  347 volts 1500 watts  347 volts  2000 watts 600 volts 2000 watts