If your water heat is not getting hot, it may have a sediment buildup in the tank. All water has minerals and sediment in it, no matter whether it’s well water or filtered city water, and that sediment will build up in the bottom of your water heater tank over time. Without regular water heater maintenance, the sediment will eventually build up to the point that it interferes with the heating element and your water heater is unable to effectively heat your water.