Can you use 8 awg wire for a tankless water heater?

Yes, you can use 8 AWG wire for a tankless water heater, but it depends on the specific electrical requirements of the unit, including its voltage and amperage. Generally, 8 AWG wire is suitable for appliances that draw up to 40 amps. Always consult the manufacturer's installation guidelines and local electrical codes to ensure compliance and safety. It's also advisable to have a qualified electrician assess your specific situation.