Goedjn wrote

You can use much of the 12-AWG for wiring inside the shed,
so it's not a total loss. you said somewhere that the
run was around 70', so I think that 8AWG wire will
get you 40A (well, 46, but I don't think they make
45A breakers) Anyway, a 40-Amp 2-pole breaker gets
you a nominal 9600 watts, to divide up into
240V and 120V circuts however you want.

OK OK I have decided to run a subpanel. BUT cripes, while the subpanels
are cheap, man, 8/3 AWG is PRICY. OK so using substantially cheaper 10/3
AWG gives me a 30A subpanel. I would think this would be sufficient:
2000W heater, plus antoher 1000W for outlets and such, gives me ~15A,
assuming full useage? 30A seems like it would be sufficient, and a LOT
cheaper. Comments?
thx