I ran a dedicated circuit to an outdoor pool heater. I ended up using about 165lf of each spool of wire that was 500lf ea.
The wire is a 10 American Wire Gauge (AWG) conductor that is stranded (STR) and made of copper (CU), with a Thermoplastic, High-Heat-resistant, Nylon-coated (THHN) insulation. This type of wire is used in conduit and cable trays for general wiring, with a 600-volt rating and a high-temperature rating of up to 90 deg C).