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2. Solar-powered Stirling engine - Wikipedia

   en.wikipedia.org/wiki/Solar-powered_Stirling_engine

   NASA patented a type of solar-powered Stirling engine on August 3, 1976. It used solar energy to pump water from a river, lake, or stream. [1] The purpose of this apparatus is to “provide a low-cost, low-technology pump having particular utility in irrigation systems employed in underdeveloped arid regions of the earth…[using] the basic principles of the Stirling heat engine“.

3. Solar thermal collector - Wikipedia

   en.wikipedia.org/wiki/Solar_thermal_collector

   The heat transfer fluid can be air, water, oil, or a mixture including glycol (an antifreeze fluid), especially in forced circulation systems. [32] Concentration systems may utilize phase change materials such as molten salts. [33] The thermal energy of the heat transfer fluid can then be used directly or stored for later use. [34]

4. Solar water heating - Wikipedia

   en.wikipedia.org/wiki/Solar_water_heating

   When a solar water heating and hot-water central heating system are used together, solar heat will either be concentrated in a pre-heating tank that feeds into the tank heated by the central heating, or the solar heat exchanger will replace the lower heating element and the upper element will remain to provide for supplemental heat. However ...

5. Patio heater - Wikipedia

   en.wikipedia.org/wiki/Patio_heater

   Hanging patio heater: portable and small footprint; comes in electric only; Tabletop patio heater: ultra-portable and great for smaller groups or outdoor dining, but it uses a small propane tank; Patio heaters have become popular with bars and restaurants, since they extend the day and the season for their customers to sit outdoors.

6. News, Politics, Sports, Mail & Latest Headlines - AOL.com

   homepage.aol.com

   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Outdoor heating - Wikipedia

   en.wikipedia.org/wiki/Outdoor_heating

   Outdoor heating is space heating that allows people to stay in substantially unenclosed spaces that would otherwise be too cold for comfort. To this end, various outdoor heating appliances are available, including gas patio heaters , quartz or ceramic electric lamps, and wood burning chimenea and fire pits.