A year before a master plumber friend installed a ready made solar disk type panels. He did not build the solar panels because it’s better and more efficient to buy it. You can save the cost of installation but you might need a permit if your state requires one. There are many factors in designing and installing a solar hot water system.
If you are not building a thermosiphon system, then you need an electrician to provide the power for your pump and sensors to run your pump.
References :
http://kingsolar.com/howdhwworks.html
http://www.backwoodshome.com/articles/hackleman65.html
Things You’ll Need:
Electric stove or hot plate
Copper sheeting
Sheet-metal shears
Micro-ammeter capable of reading currents lower the 50 microamperes
Sandpaper
2 alligator-clip leads
Clear plastic bottle
Water
2 Tbsp. salt
Step 1:
Cut 2 rectangular pieces of copper sheeting, each approximately the size of the stove burner.
Step 2:
Wash 1 piece of the copper thoroughly, and then use the sandpaper to clean off any corrosion.
Step 3:
Lay the copper sheet down on the burner.
Step 4:
Turn the burner to maximum heat.
Step 5:
Monitor the copper carefully. It will change colors as it begins to oxidize, slowly transforming to black.
References :