A solar heating system is a substantial but rewarding investment. It can reduce your monthly heating bill while helping to protect our environment. Being informed and planning carefully will ensure that you’ve chosen the right system for you and your family. Solar heaters, or solar thermal systems, provide environmentally friendly heat for household water,space heating, and swimming pools. The systems collect the sun’s energy to heat fluid. The fluid then transfers solar heat directly or indirectly to your home, water, or pool.Solar water heaters, sometimes called solar domestic hot-water systems, may be a good investment for you and your family. Solar water heaters are cost effective and offer large annual carbon savings. Although solar water heaters cost more initially than​ conventional water heaters, the fuel they use—sunshine—is free.