FWIW, I have the G3 gloves and mine don't get hot. I use just the rocker-style switch and leave them on all the time I'm riding in temps below about 45 F. While my hands don't get cold, they never get really warm either.

Per the Gerbing web site, the G3's produce only 22 watts.

 

They have a lifetime warranty on the electronics. Call the company.

 

already did