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Plumbing Problems
The shower starts hot and turns cold halfway through. That is a different problem from having no hot water at all, and it points to a short list of causes.
Short answer: When hot water runs out fast, the heater is making heat but not keeping enough of it. The usual causes are a dead lower element on an electric tank, sediment taking up room in the tank, a broken dip tube, or a tank that is simply too small for the household.
If every hot tap stays cold, you have no heat at all, and that has its own page: no hot water at all. This page is for the case where you get hot water, then it fades. The heater works. Something is limiting how much hot water you can use before it runs out.
If the water is hot but barely trickles out, that is a pressure problem and not a heat problem. Try low water pressure instead.
1. A dead lower heating element (electric tanks). An electric tank has two elements, an upper one and a lower one. The lower one does most of the work heating a full tank. When it fails, the upper element can still heat the top of the tank, so you get a short burst of hot water and then cold. Testing an element means opening a panel on live wiring, so that is a job for a plumber or electrician, with the breaker off.
2. Sediment. Minerals settle on the bottom of the tank and take up space that should hold hot water. A tank that is half full of sediment cannot hold a full tank of hot water. It often pops or rumbles when it heats. See water heater making noise for what that sounds like and what a flush does.
3. A broken dip tube. The dip tube is a plastic pipe that carries cold incoming water down to the bottom of the tank so it can be heated. If it cracks or breaks off near the top, the cold water mixes into the hot water at the top. The tap runs warm, then cool, then cold much sooner than it should. The tank is fine, but the water never gets a chance to heat properly.
4. A thermostat turned too low or failing. If the dial was bumped or an electric thermostat is going bad, the water never gets as hot as it used to. You use more hot water at the tap to get a comfortable shower, so the tank empties faster.
5. A gas burner that is dirty or not firing at full strength. Gas tanks recover slowly when the burner is clogged or the flue is blocked. A yellow or lazy flame, soot, or a pilot that keeps going out is a sign to stop and call. See pilot light keeps going out for that case.
6. A tank that is too small. If nothing is broken, the answer may be size. A family that grew, a teenager who takes long showers, a soaking tub or a vacation rental with back-to-back guests can outrun a small tank. The guide to what size water heater you need walks through how to match a heater to a household.
Not sure which one it is?
Text Ryan what happens: how long the hot water lasts, whether the tank is gas or electric, and a photo of the label on the tank. A licensed Master Plumber answers, not a call center.
Do not open an electric tank's access panel with the power on. The wiring inside is live at household voltage whenever the breaker is on.
Homes in the North Georgia mountains often have long pipe runs from a basement or crawlspace heater to a bathroom far away. That means a lot of water has to run before it gets hot, and it also means pipes lose heat on the way. If the water is cold when it leaves the tank, that is a heater problem. If it is hot at the tank and cool at the tap, insulation on the pipes may help.
If your home runs on a well, the water can bring more minerals into the tank, which speeds up sediment. A well pump that is cycling on and off can also make hot water feel weak. If your pressure swings, read well pump short cycling.
On an electric tank, an element or a thermostat is a common repair. The part is not expensive, but the testing needs a meter and care around live wiring. On a gas tank, the burner, the flue and the gas control are the places to look, and gas work is not a place to experiment. If you ever smell gas, leave first. The page on what to do if you smell gas in the house lays out the steps.
A dip tube or a dirty tank can be handled on the same visit as a diagnosis. Ryan checks it, tells you what he finds and gives you a free estimate. There is no trip fee and no diagnostic fee, and you know the price before any work starts.
A tank that runs out of hot water and is also old, rusty or leaking is usually near the end. Putting a new element into a tank that is failing from the inside is a poor use of money. Ryan gives a free estimate before any work, so you know the price first. When a bigger tank or a tankless unit solves a sizing problem for good, Ryan can quote that as well. You can read about the service on the water heater page.
"Called at 6:30 pm on Friday night and they had water by 9:30. New water heater and a filter installed on the line coming in. Very professional. Highly recommended."
Cheryl S., Dec 2025, Google review
On an electric tank, a failed lower element is a common reason. Sediment, a broken dip tube, or a tank that is too small for the household can do it too. Timing how long the hot water lasts and noting whether the tank is gas or electric helps narrow it down.
It is a plastic pipe inside the tank that carries cold incoming water to the bottom to be heated. When it cracks or breaks, cold water mixes in at the top, so the hot water cools off long before the tank should be empty.
Yes. If nothing is broken and the hot water simply does not last, the tank may not match how many people use it. The guide on what size water heater you need explains how to match a heater to a household.
It can be. Sediment takes up space in the bottom of the tank, so the tank holds less hot water than its label says. A noisy tank that also runs out fast is a strong hint.
It is not a good do-it-yourself job. The wiring is live at household voltage whenever the breaker is on, and the tank has to be drained first. Ryan does water heater repair and gives a free estimate first.
Yes. A tankless unit does not store hot water, so it does not run out the same way. Cold water in the middle of a shower usually points to flow, scale or venting. See the page on a tankless water heater not heating.
Call or text. Text is often fastest up here. Free estimate, no trip fee, no diagnostic fee.