decent, not as expected
I added hot water and less than 5 minutes later it was cold. Seems like turning it on cools the water down instead of keeping it warm. I rated it 2 stars because it actually powers on and produces bubbles. I wish I'd have used it before the return period expired  so I could have returned it. Don't purchase if you're expecting it to actually keep hot water warm. Just have to restate that it seems to be making the water cold...
Rating: 2 stars