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2. 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 ...

3. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Tankless gas electronic ignition water heaters. Gas water heaters have an exhaust vent or one to two exhaust pipes on the top, and still require electric power for electronics, sensing and ignition. A three-phase, 21 kW, 400-volt tankless water heater in Europe, with new European color coding for three-phase power.

4. Solar water heating - Wikipedia

   en.wikipedia.org/wiki/Solar_water_heating

   The tested SWH system had about 20% of the impact of an electrical water heater and half that of a gas water heater. [ 51 ] Analysing their lower impact retrofit freeze-tolerant solar water heating system, Allen et al. (qv) reported a production CO 2 impact of 337 kg, which is around half the environmental impact reported in the Ardente et al ...

5. Electric heating - Wikipedia

   en.wikipedia.org/wiki/Electric_heating

   For domestic hot water supply, or industrial process hot water, permanently installed heating elements in an insulated hot water tank may be used, controlled by a thermostat to regulate temperature. Household units may be rated only a few kilowatts. Industrial water heaters may reach 2000 kilowatts.

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]

7. District heating - Wikipedia

   en.wikipedia.org/wiki/District_heating

   There are 117 local district heating systems supplying towns as well as rural areas with hot water – reaching almost all of the population. The average price is around US$0.027 per kWh of hot water. [100] The Reykjavík Capital Area district heating system serves around 230,000 residents had a maximum thermal power output of 830 MW.