Why Is My Water Heater Not Getting Hot Enough?

Hot Water Solutions
Aug 4
5 min read

There’s a difference between having no hot water and having water that just doesn’t get as hot as it used to.

Maybe the shower starts out warm but quickly cools down. Maybe you’ve started turning the faucet farther toward the hot side. Or maybe the water is warm enough for washing your hands but not hot enough for a comfortable shower.

When a water heater is not getting hot enough, it doesn’t always mean the entire unit has failed. Sometimes the problem can be repaired. Other times, especially with an older water heater, it may be a sign that the unit is reaching the end of its life.

Here are some of the most common causes we see.

The Temperature Setting May Be Too Low

The first thing to consider is the water heater’s temperature setting. Someone may have adjusted it intentionally, or the setting may have been changed during previous service.

If the temperature is set too low, the water heater may be operating normally but still not producing water that feels hot enough. For most homes, a setting around 120 degrees provides a good balance between comfort, energy use, and reducing the risk of scalding.

We don’t recommend turning the temperature up excessively to compensate for another problem. If the water used to be hot enough at the current setting and suddenly isn’t, something else may be going on.

A Heating Element May Have Failed

Electric water heaters typically use two heating elements: one near the top of the tank and another near the bottom. If one element fails, you may still get some hot water but not as much as you normally would. The water may take longer to heat, run out quickly, or never reach the expected temperature.

A licensed plumber can test the elements and thermostats to determine which component is causing the problem.

The Burner May Not Be Heating Properly

A gas water heater depends on its burner to heat the water in the tank. If the burner isn’t operating correctly, the unit may produce lukewarm water or take much longer to recover after hot water is used. The problem could involve the burner assembly, gas control valve, thermocouple, ignition system, or another component.

Because these repairs involve natural gas or propane, this isn’t an area where we recommend experimenting. A plumber should inspect the water heater and identify the actual cause.

Your Household May Be Using More Hot Water

Sometimes the water heater hasn’t changed, your household’s demand has. Guests, teenagers taking longer showers, additional laundry, a larger bathtub, or multiple hot-water fixtures running at once can make a water heater that was once adequate feel undersized.

A standard tank-style water heater holds a limited amount of hot water. Once that supply is used, the tank needs time to heat the incoming cold water. If your current water heater has always struggled to keep up, the problem may be capacity rather than a failed component.

A Plumbing Fixture Could Be Causing the Problem

The water heater isn’t always responsible. A worn shower cartridge or mixing valve can allow too much cold water to mix with the hot water. When that happens, you may notice lukewarm water at one fixture even though the rest of the house has plenty of hot water.

A simple way to narrow it down is to check several faucets:

If only one shower or faucet has the problem, the fixture may be responsible.
If the problem affects the entire house, the water heater becomes the more likely source.

That distinction can save a lot of time when diagnosing the issue.

The Water Heater May Be Too Small

If your water heater regularly runs out during normal household use, it may not have enough capacity for your needs. Water-heater sizing isn’t based only on the number of people in the house. We also consider how the home uses hot water, how many fixtures may run at once, whether there is a large soaking tub, and how quickly the unit can recover.

Installing a larger tank or switching to a properly sized tankless system may solve an ongoing capacity problem, but we wouldn’t recommend replacing a working water heater until we’ve determined whether sizing is actually the issue.

An Older Water Heater May Be Losing Performance

Tank-style water heaters generally last around 10 to 12 years, although some fail sooner and others continue working longer. As a water heater ages, components wear out and performance can gradually decline. You may notice:

Less hot water than before
Longer recovery times
Inconsistent temperatures
Frequent repair problems
Rust or moisture around the unit

Age alone doesn’t automatically mean a water heater must be replaced. However, when an older unit develops a significant problem, replacement often makes more sense than continuing to put money into it.

Should You Repair or Replace the Water Heater?

That depends on the water heater’s age, condition, and what is actually wrong with it. A failed heating element or thermostat in a newer electric water heater may be worth repairing. A leaking or badly corroded tank usually cannot be repaired safely. With an older unit, we also consider whether the cost of the repair makes sense compared with replacement.

At Hot Water Solutions, we’ll diagnose the problem and explain your options. We’re not going to tell you to replace a water heater that only needs a reasonable repair but we also won’t recommend spending money on a unit that is clearly nearing the end of its life.

Need Help With a Water Heater That Isn’t Getting Hot Enough?

Hot Water Solutions provides water heater repair and replacement throughout Kennesaw, Acworth, Marietta, Woodstock, Canton, Cartersville, Dallas, Hiram, Roswell, Alpharetta, Cumming, and surrounding areas.

If your water isn’t staying hot or your water heater isn’t performing like it used to, call 678-540-6164 or contact us online to schedule service.

Because a cold shower should be by choice.

FAQs

Why is my water heater only producing lukewarm water?

Lukewarm water can be caused by a low temperature setting, a failed heating element, burner problems, a worn mixing valve, or increased hot-water demand.

Why does my hot water run out faster than it used to?

A failed lower heating element, increased household demand, an aging water heater, or an undersized tank can cause hot water to run out more quickly.

Should I turn up my water heater if the water isn’t hot enough?

Check the current setting, but don’t turn it up excessively to cover up another problem. If the temperature has recently changed, the water heater or a plumbing fixture may need to be inspected.