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2. Williams Companies - Wikipedia

   en.wikipedia.org/wiki/Williams_Companies

   The Williams Companies, Inc., is an American energy company based in Tulsa, Oklahoma. Its core business is natural gas processing and transportation, with additional petroleum and electricity generation assets. A Fortune 500 company, [1] its common stock is a component of the S&P 500.

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. Industrial furnace - Wikipedia

   en.wikipedia.org/wiki/Industrial_furnace

   The floor of the furnace is mostly made of a different material from that of the wall, typically hard castable refractory to allow technicians to walk on its floor during maintenance. A furnace can be lit by a small pilot flame or in some older models, by hand. Most pilot flames nowadays are lit by an ignition transformer (much like a car's ...

5. Gas heater - Wikipedia

   en.wikipedia.org/wiki/Gas_heater

   A gas heater is a space heater used to heat a room or outdoor area by burning natural gas, liquefied petroleum gas, propane, or butane. Indoor household gas heaters can be broadly categorized in one of two ways: flued or non-flued, or vented and unvented .

6. Thermostat - Wikipedia

   en.wikipedia.org/wiki/Thermostat

   The power through the thermostat is provided by the heating device and may range from millivolts to 240 volts in common North American construction, and is used to control the heating system either directly (electric baseboard heaters and some electric furnaces) or indirectly (all gas, oil and forced hot water systems).

7. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!