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  2. Tankless water heating - Wikipedia

    en.wikipedia.org/wiki/Tankless_water_heating

    A hybrid water heater is a water heating system that integrates technology traits from both the tank-type water heaters and the tankless water heaters. [5] It maintains water pressure and consistent supply of hot water across multiple hot water applications, and like its tankless cousins, it is efficient and can supply a continuous flow of hot ...

  3. Water splitting - Wikipedia

    en.wikipedia.org/wiki/Water_splitting

    More than 352 thermochemical cycles have been described for water splitting by thermolysis. [21] These cycles promise to produce hydrogen and oxygen from water and heat without using electricity. [22] Since all the input energy for such processes is heat, they can be more efficient than high-temperature electrolysis.

  4. Three utilities problem - Wikipedia

    en.wikipedia.org/wiki/Three_utilities_problem

    The classical mathematical puzzle known as the three utilities problem or sometimes water, gas and electricity asks for non-crossing connections to be drawn between three houses and three utility companies in the plane. When posing it in the early 20th century, Henry Dudeney wrote that it was already an old problem.

  5. Water heating - Wikipedia

    en.wikipedia.org/wiki/Water_heating

    A water heater is still sometimes called a geyser in the UK and South Africa. Maughn's invention influenced the work of a Norwegian mechanical engineer named Edwin Ruud. The first automatic, storage tank-type gas water heater was invented around 1889 by Ruud after he immigrated to Pittsburgh, Pennsylvania (US). The Ruud Manufacturing Company ...

  6. 7.0 magnitude earthquake reported off Northern California ...

    www.aol.com/7-0-magnitude-earthquake-reported...

    A 7.0 magnitude earthquake was reported off the coast of Northern California on Thursday, according to the United States Geological Survey. The epicenter of the "strong" quake was off the coast ...

  7. How to retire on less than $1 million and never run out of money

    www.aol.com/finance/retire-less-1-million-never...

    Bottom line. Ultimately, whether you can retire on less than $1 million will largely depend on your spending needs during retirement and your remaining life expectancy.

  8. Hydronics - Wikipedia

    en.wikipedia.org/wiki/Hydronics

    Hydronics (from Ancient Greek hydro- 'water') is the use of liquid water or gaseous water or a water solution (usually glycol with water) as a heat-transfer medium in heating and cooling systems. [ 1 ] [ 2 ] The name differentiates such systems from oil and refrigerant systems.

  9. Putin accuses West of pushing Russia to its "red lines ... - AOL

    www.aol.com/news/putin-accuses-west-pushing...

    Russian President Vladimir Putin on Monday accused the West of pushing Russia to its "red lines" - situations it has publicly made clear it will not tolerate - and said Moscow had been forced to ...