I've made a small solarpanel with a size of 20sq. inch, which are connected to an old 30gal. heater tank. In a sunny day, it'll raise those 30 gal. of water from around 70f to 82f-86f. I'll make a diary of it here sometime... ;)
Point is; after a bath (with lukewarm water from my 30gal. solar-tank, supplied with hotwater from my ordinary heater.), the temperature of the bathwater would be around 96f-100f. At this point, my solar-tank would be empty, so i fill it slowly with tapwater through a 10ft 1/2" coppercoil submersed in the used bathwater. That raises the tapwater from 46f to around 75f. :)
This is what I have been using with my Out door wood stove to heat my hot water
Here is a link to my wood stove saga
http://oldf.homestead.com/Woodmasterishere.html
An look in to using PEX tubing for the long runs a lot cheaper than copper
Old F [ Parent ]
I forgot about there being a center in that tank, that changes things! thanks for the link. mixerman[ Parent ]