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2. How Much Does It Cost to Replace a Water Heater? - AOL

   www.aol.com/lifestyle/much-does-cost-replace...

   Much larger than tankless heaters, cold water is heated by a gas flame or an electric heating coil, both located at the base of the tank. Storage tank water heaters are expected to last about 10 ...

3. 11 Reasons Why Your Water Is Only Lukewarm - AOL

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

   Water that enters your water heater carries particles like dirt and sediment with it, and eventually, that can build up in the tank. Because the buildup happens at the bottom where the heater is ...

4. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Savings in water use: Users in remote points in the building do not have to run the hot water as long, waiting for it to get to the faucet. Unlimited hot water: Though flow rate determines the amount of hot water the heater can produce, it can deliver it at that flow rate indefinitely. However, this can also be an ecological disadvantage, as ...

5. Pilot-operated relief valve - Wikipedia

   en.wikipedia.org/wiki/Pilot-operated_relief_valve

   The pressure at which the control pilot relieves is the functional set pressure of the PORV. When the pilot valve reaches set pressure it opens and releases the pressure from the dome. The piston is then free to open and the main valve exhausts the system fluid. The control pilot opens either to the main valve exhaust pipe or to atmosphere ...

6. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   [citation needed] In a comparison to a less efficient natural gas fired hot water tank, on-demand natural gas will cost 30% more over its useful life. [dubious – discuss] [citation needed] Stand-alone appliances for quickly heating water for domestic usage are known in North America as tankless or on demand water heaters.

7. 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.