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2. Phase-out of fossil fuel boilers - Wikipedia

   en.wikipedia.org/wiki/Phase-out_of_fossil_fuel...

   In many countries, gas heating is one of the major contributors to greenhouse gas emissions and climate damage, leading a growing number of countries to introduce bans. Air source heat pumps are the main alternative. [1] The International Energy Agency has said that new gas boilers (or gas furnaces) should be banned no later than 2025. [2]

3. Three utilities problem - Wikipedia

   en.wikipedia.org/wiki/Three_utilities_problem

   However, Dudeney states that the problem is "as old as the hills...much older than electric lighting, or even gas". [3] Dudeney also published the same puzzle previously, in The Strand Magazine in 1913. [4] A competing claim of priority goes to Sam Loyd, who was quoted by his son in a posthumous biography as having published the problem in 1900 ...

4. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   A central heating system provides warmth to a number of spaces within a building from one main source of ... 65–97% for gas-fired heating; 80–89% for oil-fired and;

5. Furnace (central heating) - Wikipedia

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

   Heating appliances that use steam or hot water as the fluid are normally referred to as a residential steam boilers or residential hot water boilers. The most common fuel source for modern furnaces in North America and much of Europe is natural gas; other common fuel sources include LPG (liquefied petroleum gas), fuel oil, wood and in rare ...

6. Numerical solution of the convection–diffusion equation

   en.wikipedia.org/wiki/Numerical_solution_of_the...

   The unsteady convection–diffusion problem is considered, at first the known temperature T is expanded into a Taylor series with respect to time taking into account its three components. Next, using the convection diffusion equation an equation is obtained from the differentiation of this equation.

7. Troubleshooting - Wikipedia

   en.wikipedia.org/wiki/Troubleshooting

   Troubleshooting is a form of problem solving, often applied to repair failed products or processes on a machine or a system. It is a logical, systematic search for the source of a problem in order to solve it, and make the product or process operational again. Troubleshooting is needed to identify the symptoms.