Why is my hot water sometimes not hot?

Asked By: Yusupha Lehnertz | Last Updated: 29th February, 2020
Category: home and garden home appliances
4/5 (223 Views . 14 Votes)
So a broken dip tube can mean cold water goes into your home's hot water pipes before being adequately heated. Another cause of hot water not being hot enough is sediment buildup in the water heater tank. While the water sits in and is heated by your water heater, this debris settles to the bottom of the tank.

Click to see full answer


Moreover, 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.

Likewise, why is my hot water running warm? The main causes of lukewarm water AND/OR lukewarm radiators are: A faulty thermostat. A faulty thermistor. A blocked diaphram washer or heat exchanger.

Also asked, why is my hot water not hot in the morning?

If you get cold water in the morning, chances are you're touching the water that was left sitting in the pipes. If it's still cold after a few seconds, it could be because the water heater burners have yet to ignite. And they won't ignite until you call for hot water, which is usually the first hot shower of the day.

What is the average cost to replace a hot water heater?

Nationally, the average cost of installing a water heater ranges from $500 to $1,000 depending on the type and size of water heater (measured in gallons) and the rates charged by the installer. Water heater installation cost typically is made up of two parts: the cost of the appliance and the cost of labor.

19 Related Question Answers Found

How do you know when to replace a hot water heater?

A water heater should be replaced beforehand if it shows the following symptoms:
  1. Rusting, either on the tank or in the water.
  2. Noises.
  3. Leaks.
  4. Failure to heat water.

Can water heater explode?

If the temperature is set too high or the pressure relief valve of a water heater malfunctions, a water heater can explode. This can happen with a gas or electric hot water heater. Although it is unlikely for water heaters to explode, when they do, they operate much the same as a rocket.

Why is my hot water not getting hot?

Another cause of hot water not being hot enough is sediment buildup in the water heater 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.

Why does my hot water fluctuates?


If your water temperature fluctuates, the pressure-balancing valve might be to blame. Your pressure-balancing valves open and close depending on your water flow in your plumbing system. If cold or hot water levels drop, a broken pressure valve could cause a drop in water pressure.

Why am I not getting hot water in my shower?

If your problem wasn't the anti-scalding device, your shower mixing valve has most likely gone bad and is preventing hot water from mixing properly into your shower water. Sometimes, though these valves wear out, break, or are positioned incorrectly and that can cause uncomfortable shower temperatures.

Why does my shower water temperature fluctuate?

The shower temperature changes when you flush (or use water) because the pressure in that supply line has changed. This means less supply to the mixing valve in the same setting. Modern thermostatic mixing valves are designed to keep the total pressure constant.

How does hot water get cold?

The temperature of the water approaches the temperature of it's surroundings as heat is transferred from the warmer object (either the air or the water) to the colder. Particularly if the surrounding air is dry, the water can evaporate quickly enough to become a fair bit colder than it's surroundings.

How long should hot water last in the shower?

So, a fully heated, 50-gallon tank will deliver roughly 33 gallons of hot water at any given time. The average shower uses 2 gallons of water per minute, so that same 50-gallon tank is good for a little less than 17 minutes of hot water.

How do I adjust the water temperature in my shower?


Adjust the Shower Valve
  1. Remove the handle. You may need a screwdriver to do this.
  2. Take off the metal cover beneath the handle, exposing the valve stem.
  3. Turn the RSL two notches in whichever direction desired, then put the RSL back in place.
  4. Replace the faucet handle, then test the mixture of hot and cold water.

Why is water hotter at night?

At night, while the land cools off quickly, the water at the surface is kept warmer because the water is mixed around with the warmer water underneath. All of this mixing keeps the temperature in the area more constant, not like the land that goes from hot to cold.

What is lukewarm shower?

It was a combination of “luke" and “warm," and the “luke" part was an alteration of the Middle English word lew, which meant tepid. Tepid means neither hot nor cold…or about room temperature. Lukewarm can refer to actual temperature. Lukewarm water is neither hot nor cold.

Why is my hot water pressure suddenly low?

Low Hot Water Pressure. Low hot water pressure is usually caused by sediment, rust, calcium deposits or other debris in the plumbing lines or faucets. Sometimes the pressure will slowly decrease over a period of time, particularly if your home has been plumbed with galvanized pipe.