Free solar hot water, keep it simple:
A solar batch water heater, also known as a breadbox solar water heater is a great money saving idea.
Build a solar batch water heater
Traditionally the humble water heater has accounted for around 40% of the average household's energy use here in Australia. In colder climates the heating bill is higher so the proportion of the energy bill will be lower, but even at 25% of your total energy bill, saving money by heating water with the sun makes sense.
There is a massive move towards reducing carbon production worldwide right now. Many governments are actively encouraging people to install energy efficient appliances. In line with the swing in consumer choice, due in a large part to government rebates and incentives, and definitely due to a growing public awareness of energy wastage, many people are considering solar hot water over more traditional electric element water heaters.
Stick around, read my article and put yourself in a position to save a significant amount of energy and money.