“It takes a lot of energy to heat water. Typically, up to 30% of a home’s energy consumption is used just to heat water for bathing, laundry, and cleaning. By installing a solar hot water system, homeowners can shave 200 to 500 kilowatt-hours off their electric bill per month, saving money and reducing pollution. Installing a solar hot water system is typically the first and most cost-effective step when turning to the sun for energy. Even if a photovoltaic system is your primary interest, a solar (thermal) hot water system along with a PV system will provide the best economics and space-efficiency on your roof.”
