Why Does My Water Heater Run Out of Hot Water So Fast?

Your hot water runs out quickly because of issues like improper heater sizing, sediment buildup, a damaged heating element, or a tank leak. Some of these issues require a new water heater, but most are repairable.

Homeowners need to recognize water heater problems and learn when to call a professional.

The Most Common Cause: Sediment Buildup

Indiana and Michigan have hard water, which is treated and safe to drink but is usually over 180 ppm, a rate that indicates very hard water. Water is called ‘hard’ when it has a high amount of dissolved minerals, like calcium and magnesium. Water is not made hard; instead, hard water results from the region's natural geology, and groundwater from below-ground aquifers is usually much harder than surface water.

• Michigan: 56% of Michigan residents rely on surface water for drinking water, while 44% use groundwater.
• Indiana: Around one-third of Indiana residents rely on surface water, while two-thirds use groundwater.

The minerals in this hard water accumulate in your water heater tank and are called sediment. This sediment reduces tank capacity and makes your heater run harder than normal. Flushing the tank removes this built-up sediment, and this water heater maintenance is an excellent way to keep your system in good shape.

Other Reasons You Run Out of Hot Water

Your water heater may run out quickly because of sediment buildup or one of the following issues.

1. High Hot Water Demand: Running multiple showers, dishwashers, washing machines, or faucets at the same time can deplete your hot water supply faster than your water heater can recover.
2. Broken Dip Tube: A damaged dip tube allows cold water to mix with hot water near the top of the tank, causing the water to cool much sooner than expected.
3. Thermostat or Heating Element Issues: A thermostat set too low, a faulty thermostat, or a failed heating element can prevent the water from reaching or maintaining the proper temperature.
4. Undersized Water Heater: Tanks that are too small for your household's hot water demand may regularly run out of hot water.
5. Aging Water Heater: Electric tanks last 10-13 years, gas tanks last 8-12 years, electric tankless last 15-20 years, and gas tankless last 18-20+ years. Older units naturally lose efficiency over time.

How to Fix It

Some water heater issues only need basic maintenance, while others require professional water heater repair or replacement.

• Flush the Tank: If sediment buildup is the problem, flushing the tank is the solution. In hard water areas like Indiana and Michigan, annual flushing is especially important.
• Reduce Hot Water Demand: Avoid running multiple showers and appliances like washing machines at the same time. Pacing out hot water use allows the tank time to recover, but this is not a permanent solution.
• Replace Worn Components: A plumber can replace a broken dip tube or failed heating element to restore consistent hot water without replacing the entire unit.
• Install the Right-Sized Water Heater: If your household has outgrown its current tank, upgrading to a larger capacity model can eliminate frequent shortages.
• Replace an Aging Water Heater: Once a unit reaches the end of its expected lifespan, repairs become less cost-effective. A new water heater provides better efficiency and performance.
• Consider Tankless: These systems heat water on demand instead of storing it in a tank, providing a continuous hot water supply.

In some situations, a licensed technician is needed to identify the underlying problem and recommend the most cost-effective solution.

When to Call Home Comfort Experts

If flushing and simple fixes do not help, it’s time to book water heater services. Home Comfort Experts' technicians are ready to help.