That looks familiar. Yes I would say it should help with a dimmer.
Roger, I bought a new 14" model from walmart a few weeks ago and posted about it. After a few days of breaking in the bubbles went away in the wax and it worked pretty good for $14. I only returned it as I got a 16.3" model from spencers which has a much bigger bottle.
I only burned it for about 7 to 8 hours at a time and never had the issue you report.
Why put a dimmer on a new item that you can return and get another if in fact there is something wrong with it. Did you try spencers as they have a great selection in most stores, in different sizes as well.