40 amp
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The amp size of a wire is determined by its gauge, not the number of wires. An 8-gauge wire is typically rated for around 40-60 amps, depending on the type and insulation of the wire.
You will need to use #8 wire.
For a 20 amp circuit, a 12-gauge copper ground wire is typically recommended. This wire size can safely handle the current and provide proper grounding for the circuit.
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
Yes, no problem at all going to a larger ampacity of wire. Larger size wire yes, smaller size wire no.
If the wire will fit into the breakers terminal without cutting off any strands from the #8 conductor, then it is OK to use that size. This situation usually happens when a larger size wire has to be used to overcome voltage drop when the load is quite a distance away.