Minimum size is 10 gauge with a 30 amp breaker. To be safe I would install an 8 gauge with a 40 amp breaker.
12
A #10 copper conductor with an insulation factor of 90 degrees C is rated at 30 amps.
Service wire for 100 amps requires AWG #3 copper.
Number 10 thnn copper wire.
Look on the heater and see what amps it is pulling. That will determine the wire size and breaker size. It must be on a dedicated circuit. 15 amps = AWG # 14 wire with 15 amp breaker 20 amps = AWG # 12 wire with 20 amp breaker 30 amps = AWG # 10 wire with 30 amp breaker 40 amps = AWG # 8 wire with 40 amp breaker
To calculate the wire size, a system voltage is needed.
A #10 copper conductor with an insulation factor of 90 degrees C is rated at 30 amps.
Service wire for 100 amps requires AWG #3 copper.
AWG 10.
10 guage
Number 10 thnn copper wire.
15 amps.
15mm approx.
Look on the heater and see what amps it is pulling. That will determine the wire size and breaker size. It must be on a dedicated circuit. 15 amps = AWG # 14 wire with 15 amp breaker 20 amps = AWG # 12 wire with 20 amp breaker 30 amps = AWG # 10 wire with 30 amp breaker 40 amps = AWG # 8 wire with 40 amp breaker
# 4 copper wire short distance.
The V stands for volts and A is amps. If for example you have a 12kVA device and are running off a voltage of 120 volts then Amps = 12000/120 = 100. You then use the calculated amps in a wire size table to get the correct size.
To calculate the wire size, a system voltage is needed.
A #10 wire with an insulation rating of 60,75 or 90 degrees C is rated at 30 amps respectively.