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2. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   High-efficiency condensing furnaces condense the water vapor (one of the by-products of gas combustion) and extract the latent heat to pre-heat the incoming furnace airflow, using a second heat exchanger. [2] This increases the efficiency (energy delivered into the building vs. heating value of gas purchased) to over 90%.

3. Furnace (central heating) - Wikipedia

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

   The fourth category of furnace is the high-efficiency condensing gas furnace. 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 ...

4. 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.

5. New efficiency standards for home furnaces unveiled [Video] - AOL

   www.aol.com/news/biden-administration-unveils...

   DOE estimates that this efficiency improvement, and the resulting lower gas bills, would save consumers $1.9 billion annually — or $500 over the lifetime of each new furnace.

6. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   Institutional heating systems (office buildings or schools, for example) can use low-grade, inexpensive bunker fuel to run their heating plants, but capital cost is high compared to more easily managed liquid fuels. Natural gas is a widespread heating fuel in North America and northern Europe. Gas burners are automatically controlled and ...

7. International Comfort Products - Wikipedia

   en.wikipedia.org/wiki/International_Comfort_Products

   The KeepRite brand has been a major brand in Canada for 50 years. High efficiency oil furnaces, produced exclusively at the Quebec plant, carry the Lincoln name. Day & Night began as a solar water heater company in 1909 in Monrovia, California, providing Californians with round-the-clock hot water. It ventured into space heating in 1930s.