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A cheap coffee percolator (often on sale for around $ 10-15) with the
"water boiling" parts removed or disabled works very well for a few
years... All that's left is the warming plate that is
thermostatically controlled well below boiling temperature. It does
burn out every few years with all-day use as pickle pot, but it's a
lot cheaper than any of the commercial units....
Sandra Kay and Peter Bauer