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2. Pilot light - Wikipedia

   en.wikipedia.org/wiki/Pilot_light

   In natural gas furnaces, water heaters, and room heating systems, a safety cut-off switch is normally included so that the gas supply to the pilot and heating system is shut off by an electrically operated valve if the pilot light goes out. This cut-off switch usually detects the pilot light in one of several ways: A flame rectification device. [2]

3. Tips for troubleshooting water heater issues - AOL

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

   Water heater issues are similar and depend on whether you have a gas or electric heater. The cost to replace the thermostat or heating element are about the same. Costs can vary for a full ...

4. Thermostat - Wikipedia

   en.wikipedia.org/wiki/Thermostat

   For tankless "on demand" water heaters, pilot ignition is preferable because it is faster than hot-surface ignition and more reliable than spark ignition. Some programmable thermostats - those that offer simple "millivolt" or "two-wire" modes - will control these systems.

5. Thermocouple - Wikipedia

   en.wikipedia.org/wiki/Thermocouple

   So long as the pilot flame remains lit, the thermocouple remains hot, and the pilot gas valve is held open. If the pilot light goes out, the thermocouple temperature falls, causing the voltage across the thermocouple to drop and the valve to close. Where the probe may be easily placed above the flame, a rectifying sensor may often be used ...

6. Here's How Often You Should Drain Your Water Heater ... - AOL

   www.aol.com/heres-often-drain-water-heater...

   Step 3: Attach a water hose to the drain valve at the bottom of your water heater and run the hose outside or into a nearby drain. You can use any generic hose for this step, and a garden hose ...

7. 11 Reasons Why Your Water Is Only Lukewarm - AOL

   www.aol.com/11-reasons-why-water-only-171300843.html

   This type of water heater could be 24% to 34% more energy-efficient than a traditional water heater, according to the Department of Energy. Tankless water heaters can also save space, as they don ...