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Thank you all for great answers!

You are correct that it's 4500W total for five heaters and my wire from panel has three wires plus copper ground (10-3). I also should have said 4Amps each heater not Volts. The thermostat I have...

I purchased five wall heaters for hook-up in series in my basement. They are 240 volt and I'm setting them to 900 watts - which pull about 4.6 volts each. I've placed a 30amp double circuit breaker...