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2. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   Electric heating or resistance heating converts electricity directly to heat. Electric heat is often more expensive than heat produced by combustion appliances like natural gas, propane, and oil. Electric resistance heat can be provided by baseboard heaters, space heaters, radiant heaters, furnaces, wall heaters, or thermal storage systems.

3. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Such a system contains a boiler, furnace, or heat pump to heat water, steam, or air in a central location such as a furnace room in a home, or a mechanical room in a large building. The heat can be transferred by convection, conduction, or radiation. Space heaters are used to heat single rooms and only consist of a single unit.

4. Furnace (central heating) - Wikipedia

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

   Furnaces are mostly used as a major component of a central heating system. Furnaces are permanently installed to provide heat to an interior space through intermediary fluid movement, which may be air, steam, or hot water. Heating appliances that use steam or hot water as the fluid are normally referred to as a residential steam boilers or ...

5. Electric arc furnace - Wikipedia

   en.wikipedia.org/wiki/Electric_arc_furnace

   An electric arc furnace (the large cylinder) being tapped Rendering of exterior and interior of an electric arc furnace. An electric arc furnace (EAF) is a furnace that heats material by means of an electric arc. Industrial arc furnaces range in size from small units of approximately one-tonne capacity (used in foundries for producing cast iron ...

6. Coleman County Electric Cooperative - Wikipedia

   en.wikipedia.org/wiki/Coleman_County_Electric...

   Coleman County Electric Cooperative, Inc. is a non-profit rural electric utility cooperative headquartered in Coleman, Texas. The Cooperative was organized in 1937, and established under the federal Rural Electrification Act .

7. Safety-critical system - Wikipedia

   en.wikipedia.org/wiki/Safety-critical_system

   Several reliability regimes for safety-critical systems exist: Fail-operational systems continue to operate when their control systems fail. Examples of these include elevators, the gas thermostats in most home furnaces, and passively safe nuclear reactors.