Solar Water Heating

Solar water heaters are an even greener hot water solution that uses a dark-color solar collector to capture the solar energy. Solar water heating systems can be "passive," where the water flows between the collection are to the storage tank via gravity or some other non-mechanical means; or "active," which uses a circulating pump to move water through the system. An active system may also be called "forced circulation," and requires more energy than passive systems.

Even the most efficient solar water heaters sometimes require some auxiliary heating (boosting). This may be because of a large, late-in-the-day hot water usage or after a long period of extensive cloud cover. An electric, gas or other fuel-type booster can be quite effective in enabling a solar water heater to provide a year-round supply of steaming hot water, but it also obviously adds more energy requirements.