Water heating is a major energy user. As we use hot water for our showers, laundry and washing dishes, collectively, we are consuming a quarter of our residential energy worldwide.
By changing to a solar water heating system you shift that energy to a clean renewable source and reduce the burden on the electrical grid, which often is powered in part by polluting sources of energy.
This action takes some upfront investment and depends on home ownership or a very good landlord relationship. But in the long run, it will end up saving you energy by using the ever-present power of the sun.