I have a new never used Zodi stove top water heater.  This unit sits atop the stove burners and the water is heated as the water passes through the coils (battery operated pump).  One can use it to heat a bucket of water, or take a shower directly.

The current one seems to be $130 plus shipping.  It is similar to this one, but sits on both burners and is black:
http://www.zodi.com/web-content/Consumer/zodihotstovetopshower.html

I'll sell this one for $50 (USD) plus shipping from Halifax Nova Scotia.  It's a bit heavy so shipping could be $30

P-mail please.