One of the first things I look for when reading a user manual (yeah, I do that) for an electric appliance/tool is to look for extension cord recommendations, or find the amperage and figure it out myself.
When needed, I mostly use 25 foot 14 gauge extension cords, but have 25 foot and longer 12 gauge extension cords.
https://www.protoolreviews.com/buying-guides/extension-cord-size-chart-wire-gauge-amps/50202/ Heating appliances are notorious!!
Just before winter I bought a 15 amp table saw, and hope to use an 11 amp shop vac to collect dust. I'm hoping it won't pop the garage's 20 amp circuit breaker. we'll see.