It does exactly as it says...
Now for the bubbling aspect I think isn't much but it keeps the water warm. I. Start out with hot water and it keeps it warm.  I've relaxed and used it for 2 hrs even it it stayed comfortable warm.<br /><br />It does not heat cold water it only helps keep it warm. It's only about $20 what are you really going to expect. I'd recommend this product to anyone.<br /><br />It is a little bit louder than I'd like but it is not like a jet plane lol... some reviews are a bit crazy. Also Amazon is very simple to return but there won't be any need for that.<br /><br />Simply this item is perfect and awesome.  I did want a collapsible one but I couldn't pass up this price and the look.<br /><br />Also so far very easy to clean is a very nice plastic.
Rating: 5 stars