My apologies. It's a Dr Infrared Heater 7500-Watt 240-Volt, Model #DR-975
No neutral was required for the wiring. It was 8/2 Romex off of a 2 pole 40amp breaker, So two #8 hots and a ground.
I can run a separate circuit off of an outlet near where I want to add the thermostat but I don't know...