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

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

   Step 1: Shut off the cold water supply on the top of the water heater. Step 2: Next, disconnect the power to the water heater or shut off the gas supply. The water inside the tank will be hot, so ...

3. Heat trap - Wikipedia

   en.wikipedia.org/wiki/Heat_trap

   Microcirculation on the left: Heated water is rising into the pipe on top of the hot water tank, cooling off on the sides of the pipe and thence circulating back into the tank. Right: Circulation of hot water is inhibited by the loop in the pipe. Heat traps are valves or loops of pipe on the cold water inlet and hot water outlet of water heaters.

4. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   Gas furnace (top) and storage water heater (bottom) (Germany) In household and commercial usage, most North American and Southern Asian water heaters are the tank type, also called storage water heaters. These consist of a cylindrical vessel or container that keeps water continuously hot and ready to use.

5. 20 Ways to Lower Your Electric Bill This Winter

   www.aol.com/finance/20-ways-lower-electric-bill...

   Lower the Hot Water Heater Temperature The default temperature for water heaters is 140 degrees, which wastes between $36 and $61 a year, according to the Department of Energy.

6. Water heat recycling - Wikipedia

   en.wikipedia.org/wiki/Water_heat_recycling

   Installation of a double-walled copper-on-copper heat exchanger in a vertical section of the master drain line in a Canadian home (2007) Water heat recycling (also known as drain water heat recovery, waste water heat recovery, greywater heat recovery, [citation needed] or sometimes shower water heat recovery [citation needed]) is the use of a heat exchanger to recover energy and reuse heat ...

7. Expansion tank - Wikipedia

   en.wikipedia.org/wiki/Expansion_tank

   An expansion tank or expansion vessel is a small tank used to protect closed water heating systems and domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer [citation needed] and absorbs excess water pressure caused by thermal expansion. [1]