Why is my hot water coming out lukewarm?

Faulty heat exchanger When you turn on the hot water and your boiler fires up to heat the water, it should stay running the whole time the tap is turned on. However, if your boiler is cutting out and the hot water is only getting lukewarm – this is a sign the plate heat exchanger is blocked.Click to see full answer. In this way, why is my hot water running lukewarm? Sediment buildup in the tank While the water sits in and is heated by your water heater, this debris settles to the bottom of the tank. Many water heater burners are on the bottom of the tank. So this buildup of debris can make your water heater less effective at heating your water, leading to lukewarm water.Furthermore, why does my hot water temperature fluctuate? Adjust the thermostat brackets if necessary to keep the thermostats snug against the tank. A failed thermostat or heating element in an electric water heater can also cause hot water temperature fluctuations. Sediment build-up at the bottom of the tank can cause hot water temperature fluctuations. Subsequently, one may also ask, what are the signs your hot water heater is going out? 7 Signs Your Water Heater is Going Out The Water is Gritty or Discolored. An Unusual Smell in the Hot Water. The Age of Your Water Heater. Insufficient Hot Water. Unusual Sounds Coming From Your Water Heater. Faulty or Leaking TPR Valve. The Tank Leaks. How do you flush a hot water tank? How to Flush Your Hot Water Heater Turn the Knob on Your Hot Water Heater’s Thermostat to “Off” Turn Off Gas to Hot Water Heater. Turn Off the Cold Water Supply to Hot Water Heater. Turn on the Hot Water in a Sink or Tub. Open the Pressure Relief Valve. Connect Garden Hose to Drainage Spigot. Turn on Spigot and Drain. Flush.