Should you run 10-3 wire for the 220 - 240V lines for a pool pump and heater?

== == Well, you can run a 10/3, if that's what the unit calls for. If the pool heater equipment/motor only call for a 30 amp feeder you're away. I think this would be a bit light myself. You would have to tell me what the pool equipment manual is calling for before I can tell you what to run. If you get stuck, as always, consult a qualified electrician. <><><> It depends on the current load of the pump and the length of the run. Check Google. I found some handy calculators when wiring my outbuildings. (And for reference, we ran 40A service 200ft out to a barn through aluminum [It's underground wiring, and I used special aluminum connectors]- 2 ga wire was the best fit.)

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.