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  2. Tips for troubleshooting water heater issues - AOL

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

    Tank-style water heaters use natural gas or an electric coil to heat the water in the tank. Gas water heaters are generally less energy-efficient than electric water heaters, but the cost of ...

  3. Tips for troubleshooting water heater issues - AOL

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

    Learn how to quickly troubleshoot your water heater. For premium support please call: 800-290-4726 more ways to reach us

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

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

    Draining your water heater is a key home maintenance task you won’t want to ignore.

  5. Plumbing - Wikipedia

    en.wikipedia.org/wiki/Plumbing

    sewage systems and septic systems with or without hot water heat recycling and graywater recovery and treatment systems; Rainwater, surface, and subsurface water drainage; fuel gas piping; hydronics, i.e. heating and cooling systems using water to transport thermal energy, as in district heating systems, like for example the New York City steam ...

  6. Water heating - Wikipedia

    en.wikipedia.org/wiki/Water_heating

    An 80 US gal (300 L; 67 imp gal) electric storage tank water heater was able to have a minimum energy factor of 86% under the pre-2015 standard, while under the 2015 standard, the minimum energy factor for an 80-gallon electric storage tank water heater is now 197%, which is only possible with heat pump technology. This rating measures ...

  7. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.

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