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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. [6] 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 heating - Wikipedia

    en.wikipedia.org/wiki/Water_heating

    Under the pre-2015 standard, a 75 US gal (280 L; 62 imp gal) gas storage water heater with a nominal input of 22 kW (75,000 BTU/h) or less was able to have an energy factor as low as 53%, while under the 2015 standard, the minimum energy factor for a 75-US-gallon gas storage tank water heater is now 74%, which can only be achieved by using ...

  4. Hand warmer - Wikipedia

    en.wikipedia.org/wiki/Hand_warmer

    Air-activated hand warmers contain cellulose, iron powder, activated carbon, vermiculite (which holds water) and salt. They produce heat from the exothermic oxidation of iron when exposed to air . [ 5 ] [ 6 ] The oxygen molecules in the air, together with the water, react with iron, forming rust (which is a hydrated oxide of iron).

  5. Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania

    Suggested revenue sources include taxing natural gas drilling as Pennsylvania is the only state without such a tax on gas drilling. [175] Additional revenue prospects include trying to place tolls on interstate highways; specifically Interstate 80 , which is used heavily by out of state commuters with high maintenance costs.

  6. Illinois - Wikipedia

    en.wikipedia.org/wiki/Illinois

    However, Illinois has very limited crude oil proved reserves that account for less than 1% of the U.S. total reserves. Residential heating is 81% natural gas compared to less than 1% heating oil. Illinois is ranked 14th in oil production among states, with a daily output of approximately 28,000 bbl (4,500 m 3) in 2005. [167] [168]

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