Heat Pumps and Electric Heating - Electric heat. Circuit breaker

Any advice appreciated. I have an unused single 15 Amp circuit available in my garage. Is there a baseboard heater that I can hard wire into this single pole circuit breaker?

Or...I have a 40 Amp double breaker I never use. Perhaps the last owner had an arc welder. Can this be removed and a double 20 Amp breaker be installed for a baseboard heater?

I want one item on the circuit...a single 1000 watt baseboard heater.
thanks

Or...I have a 40 Amp double breaker I never use.

There ya go. Pull that out and put in what you will need for your new 220V baseboard. You said 1000watts . You know thats only 3413 Btu is all.
With that open breaker you can put in a bigger baseboard
if you want

Thanks.

Yes, thanks for the advice on a bigger heater. There is no downside except for a couple dollars intitial cost. The heater will just turn off quicker when temp is reached.

This is slightly more confusing than I thought it would be. Is this the general set up? I'm using a Dimplex 2000 watt heater.

20amp breaker....12/2 wire...connects to thermostat by 12/2 wire....connects to baseboad heater.

There is no 18/2 thermostat wire used? I don't quite understand why the thermostat needs to be between the breaker and the heater. (not a problem but just curious).

thanks

Seems to be a Line Voltage thermostat, regulating the current to the baseboard heat. Ergo, it's first in line, so that it will turn the baseboard heater on and off.