JMN
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The elements are external to the water vessel in this unit. The bottom of the water area is solid aluminium, I have what is effectively a cake cooling rack in the bottom to keep the elements heating the water instead of near direct contact with a flask.I've used these 'tea urns' as we call them here for god knows how many years (run out of fingers). No rust issues, going strong. I have a perforated aluminium type of lid in the bottom to cover element so flasks do not sit on it. Holds about 5 Success flasks or a three flask unit tipped over leaning against the side. Brought a second a few months back because I often have need to do 8-10 at a time. Can control temp which is good for fast and slow cure. They heat really fast, so you'd have to do a manual slow temp increase if you wanted slow heat increase.
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