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2. Propane, butane, and LPG container valve connections

   en.wikipedia.org/wiki/Propane,_butane,_and_LPG...

   Several types of valve connections for propane, butane, and LPG containers exist for transport and storage, sometimes with overlapping usage and applications, and there are major differences in usage between different countries. Even within a single country more than one type can be in use for a specific application.

3. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   Earlier models were made of chromed copper or brass, which were expensive, but since 1970, units made of injected plastics are popular due to low prices similar to that of a hair dryer. Electric showers have a simple electric system, working like a coffee maker, but with a larger water flow. A flow switch turns on the device when water flows ...

4. Solar water heating - Wikipedia

   en.wikipedia.org/wiki/Solar_water_heating

   When the storage tank in a "drainback" system reaches its desired temperature, the pumps stop, ending the heating process and thus preventing the storage tank from overheating. Some active systems deliberately cool the water in the storage tank by circulating hot water through the collector at times when there is little sunlight or at night ...