Teardown of an electrode heated muff / hot water bottle.

An electrode water heating device that is relatively safe for a change (although it relies on a single thermal switch). This one has the electrified water inside a sealed two layer plastic/vinyl bag with a thermal switch to turn it off once heated. I'm not sure what would happen if the thermal switch failed. The bag might swell up with steam to the point the electrodes were clear of the water, or it might just burst.
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The listing I bought this from was as follows, noting that it is specified as a 220V unit, so it will take longer to heat on 110V.
http://www.ebay.com/itm/251926688809