I have a non-heated non-electric one. It has a mechanical flow control and it branches off from the main toilet line, so you're getting tap-temperature water. I

I have a non-heated non-electric one. It has a mechanical flow control and it branches off from the main toilet line, so you're getting tap-temperature water. It's surprisingly comfortable to use (and I used it in New England in the winter). It's not much different than putting your hands in cold water, and it only takes a second to wash up. I found it substantially more hygienic than toilet paper (and I could always add a little soap if necessary), and at ~$30, it paid for itself in a year.