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2. Condensing boiler - Wikipedia

   en.wikipedia.org/wiki/Condensing_boiler

   Condensing boilers are water heaters typically used for heating systems that are fueled by gas or oil. When operated in the correct circumstances, a heating system can achieve high efficiency (greater than 90% on the higher heating value ) by condensing water vapour found in the exhaust gases in a heat exchanger to preheat the circulating water.

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. US plans water heater standards, says they will save ... - AOL

   www.aol.com/news/us-plans-water-heater-standards...

   The U.S. Department of Energy on Friday proposed energy efficiency standards on water heaters it said would save consumers $11.4 billion on energy and water bills annually. The standards on ...

5. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as compared to a mid-efficiency forced-air or forced-draft furnace, is the ...

6. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   The water circulates through a copper heat exchanger and is warmed by gas or electrical heating. Since there is no finite tank of hot water that can be depleted, the heater provides a continuous supply. To protect the units in acidic environments, durable coatings or other surface treatments are available. Acid-resistant coatings are capable of ...

7. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   For older houses where the water heater is part of the space heating boiler, and plumbing codes allow, some plumbers install an automatic gas shutoff (such as the "Watts 210") in addition to a TPR valve. When the device senses that the temperature reaches 99 °C (210 °F), it shuts off the gas supply and prevents further heating.