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2. 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.

3. Rinnai - Wikipedia

   en.wikipedia.org/wiki/Rinnai

   Rinnai Corporation is a Japanese multinational company based in Nagoya, Japan, that manufactures gas appliances, including energy-efficient tankless water heaters, [4] home heating appliances, kitchen appliances, gas clothes dryers and commercial-use equipment such as rice cookers, grillers, fryers and salamanders.

4. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   In contrast, 90% of natural gas's energy value is delivered to the consumer. [citation needed] (In neither case is the energy expended exploring, developing and extracting coal or natural gas resources included in the quoted efficiency numbers.) Gas tankless water heaters shall have an energy factor of 82% or greater under the 2015 standards ...

5. Edwin Ruud - Wikipedia

   en.wikipedia.org/wiki/Edwin_Ruud

   Edwin Ruud (9 June 1854 – 9 December 1932) was a Norwegian-American mechanical engineer and inventor who immigrated to the United States where he designed, sold, and popularized the tankless water heater.