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2. Fireplace insert - Wikipedia

   en.wikipedia.org/wiki/Fireplace_insert

   The fireplace insert was invented in 1742 by Benjamin Franklin, which he called 'The Pennsylvania Fireplace' (also known as the Franklin Stove), in the United States.He came upon the idea as a means of using coke (a smokeless fuel made by the destructive distillation of certain types of coal) and incorporated the use of an electric blower to improve efficiency.

3. Electric fireplace - Wikipedia

   en.wikipedia.org/wiki/Electric_fireplace

   The electric fire was invented in 1912 [2] and became popular in the 1950s. [3] Electric fireplaces found in 1950s homes were typically small and could be easily moved. [4] Techniques for electrical "flame effects" have been around since at least 1981. [5] Commercial electric fireplace techniques include the Optiflame, introduced in 1988 by ...

4. 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.

5. List of oldest companies in the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_oldest_companies...

   This list of the oldest companies in the United States includes brands and companies, excluding associations, educational, government or religious organizations.To be listed, a brand or company name must remain, either whole or in part, since inception.

6. Chimney - Wikipedia

   en.wikipedia.org/wiki/Chimney

   A chimney is an architectural ventilation structure made of masonry, clay or metal that isolates hot toxic exhaust gases or smoke produced by a boiler, stove, furnace, incinerator, or fireplace from human living areas.

7. Underfloor heating - Wikipedia

   en.wikipedia.org/wiki/Underfloor_heating

   Electric underfloor heating systems cause low frequency magnetic fields (in the 50–60 Hz range), old 1-wire systems much more so than modern 2-wire systems. [ 49 ] [ 50 ] The International Agency for Research on Cancer (IARC) has classified static and low-frequency magnetic fields as possibly carcinogenic (Group 2B).