"How to eliminate 1/3 of your power bill by making your own solar hot water system!" Heating water takes an immense amount of energy and that's why it makes sense to build a solar hot water system for your home. A solar water heater can reduce your electricity bill by up to 33% and setting up the system is dead simple. Using easy to find parts you can make the solar heater in your backyard for under $100. Keep reading to discover how you can build your own solar hot water system and how this can benefit our environment.