was done years ago, heat exchanger in water tank.

can't recall name of old listmember... but ran coolant line through
water tank to heat. it on the web somewhere.

Mark Cummock did a version, cold water
http://www.kayakwesty.com/shower.html

alistair

PS there are widgets to attach to engine to get a hot water shower
when engine running, australian I think

On 12-Sep-10, at 6:49 PM, Don Hanson wrote:

   Engine heat is often used in  yachts for heating shower and galley
water.
I am surprised someone who's a Westie-gadget tinker er has not done
one for
vans.  You could pull into camp and have a hot shower waiting, even on
cloudy days or just turn on the motor for maybe 10 minutes..
   Don Hanson