No, in fact the cheap thing is allergic to heat. The manual says it’s important to fill with /cold/ water. And the running time is restricted to like 4 min. If I run two cycles, the water gets a little warm despite (apparently) having no heating element. The manual also says not to run more than 2 cycles. So it seems the thing is sensitive to heat and the water functions to keep the ultrasonic generator cool, which makes it a bit sucky. I know pro jewelers who have industrial cleaners that have heating elements to deliberately make the liquid very hot.