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2. Tips for troubleshooting water heater issues - AOL

   www.aol.com/tips-troubleshooting-water-heater...

   Learn how to quickly troubleshoot your water heater. ... Water heating problems are some of the most common plumbing issues. On average, water heater repairs cost $150-$250, ...

3. Stellar corona - Wikipedia

   en.wikipedia.org/wiki/Stellar_corona

   The coronal heating problem in solar physics relates to the question of why the temperature of the Sun's corona is millions of kelvins greater than the thousands of kelvins of the surface. Several theories have been proposed to explain this phenomenon, but it is still challenging to determine which is correct. [ 30 ]

4. Aerodynamic heating - Wikipedia

   en.wikipedia.org/wiki/Aerodynamic_heating

   Aerodynamic heating is the heating of a solid body produced by its high-speed passage through air. In science and engineering, an understanding of aerodynamic heating is necessary for predicting the behaviour of meteoroids which enter the Earth's atmosphere, to ensure spacecraft safely survive atmospheric reentry, and for the design of high-speed aircraft and missiles.

5. Heating, ventilation, and air conditioning - Wikipedia

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

   Most modern hot water boiler heating systems have a circulator, which is a pump, to move hot water through the distribution system (as opposed to older gravity-fed systems). The heat can be transferred to the surrounding air using radiators, hot water coils (hydro-air), or other heat exchangers. The radiators may be mounted on walls or ...

6. 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.

7. Stefan problem - Wikipedia

   en.wikipedia.org/wiki/Stefan_problem

   The classical Stefan problem aims to describe the evolution of the boundary between two phases of a material undergoing a phase change, for example the melting of a solid, such as ice to water. This is accomplished by solving heat equations in both regions, subject to given boundary and initial conditions. At the interface between the phases ...