Don't daisy-chain extension cords for a pressure washer.

No. Not for a 10-amp motor. Even though 14-gauge wire can handle 15 amps, the voltage drop over 100 feet will starve the pressure washer, making the motor run hot and possibly damage it. Two cords in series also add extra connection points that can overheat or fail.

The math: a 10-amp load on 100 feet of 14-gauge drops about 9 volts. That’s a 7.5% drop – over the 5% most manufacturers recommend. Motors hate low voltage. They draw more current to compensate, which cooks the insulation. Plus each cord connection is a weak spot for resistance and heat.

Get a single 12-gauge cord rated for 100 feet, or better, 10-gauge if you want headroom. It’ll cost more but your pressure washer (and your home’s wiring) will thank you.

This is not where you save twenty bucks.