Air Conditioner Heating - Blogs & Forums On Split AC Units

Blog Title: how does electric water heater work

Main Que: How does an electric water heater work?

  • Category: Maintenance Of Tankless Hot Water Heater
  • Query By: VIOLET STEVENSON (Columbus, GA)
  • Date: 05/28/2013

Answer: "The typical electric unit is wired to a 220-volt circuit. To heat the water, the current passes through electrical-resistance heating elements—usually two, one at the middle of the tank and one at the bottom. Power is delivered to each element through a thermostat—a switch that senses the water temperature. When the temperature drops, the switch closes to allow current flow, and it opens when the temperature reaches its preset limit. Thermostats have a dial for setting the maximum water temperature—generally between 130 degrees and 140 degreesF, or as low as about 120 degreesF for increased energy savings and scald protection. When a hot-water tap is opened, cold water enters the tank through the dip tube and the drop in temperature triggers the thermostat and element at the bottom. As the water at the top of the tank is replaced by cool water, the temperature at the top thermostat drops and its element kicks in. When the tap is turned off, the heating elements continue to carry current until the thermostats are satisfied. "

  • Replied By: JEFF HARPER (Beaumont, TX)
  • Replied Date: 06/01/2013