I'm using the meziere wp136s which is a purpose built remote water pump, they're designed to be run continuously and have a better tolerance for higher operating temps. Even though my pump is mounted inside of my fender it still gets hot in there. I don't have any idea what the current draw is, but the pump comes with a 20a fuse, so never more than that. I upgraded my alternator to a 270a dc power engineering one a while ago so I don't have to sweat adding anything electrical to my car.