What’s the voltage for the unit that has a blower

Hello, thank you for reaching out. The Williams 6502921A unit with a factory-installed blower requires 120V. The gas heater itself can operate without electricity; but with this specific unit - the included blower is what requires 120V of electricity. If you have additional questions, please feel free to reach out over the phone to our Customer Service line at 1-888-901-5460. Have a great rest of your day.