Thinking about saving energy probe several prototype solar boiler and this is the best and I worked on everything was very cheap

Step 1: Description

Using the installation of the house
I have at home on the roof water tank one that is used to water when needed. one day I cleaned and note that the hot water was then exposed to the sun all day. The basic idea is to use this water heated by the sun to bathe.

Step 2: Modifications and Operation

Modifying water connections
basically what we have to do is connect directly to the departure of water tank shower and black paint of the water tank, that is to better absorb heat from sunlight

mode of operation
all you have to do is close the valve âBâ step in that do not reach the normal supply of water to the shower, so only use water from the water tank.
the valve âBâ must be open when no one was to bathe for refill the water tank.

Step 3: Inside of Water Tank

A water tank has an outlet through which fills with water and then same supply the water system in the house.

Step 4:

Option 2 you could connect directly from water tank, the water flow By gravity to the shower, the only condition is maintain fill the pipe always.

Future ideas
best way to cath the sun's heat is possible by adding reflectors to concentrate more sunlight to water tank, could also be placing an acrylic or crystal transparent coating to the heat of water tank not escape heat at night, that is doing works like a thermos.