How To Fix a Water Heater That Takes Too Long To Heat Up

Waiting too long for hot water can be frustrating and costly, wasting both time and energy. Whether you’re trying to take a shower or wash dishes, slow-heating water disrupts your routine and increases utility bills.

In areas with cold winters and hard water, like Bloomington-Normal, water heaters work even harder, making slow heating a common issue. In this guide, Covenant Plumbing explains the possible causes of slow water heating, what you can do to fix it, and when to call a professional.

Why Is Your Water Heater Heating Slowly?

Several factors can cause slow heating times, especially in regions with harsh winters and mineral-heavy water. Common causes include:

• Sediment Buildup – Hard water causes mineral deposits to collect at the bottom of your tank, blocking heat transfer.
• Cold Winter Temperatures – Colder incoming water takes longer to heat.
• Faulty Heating Elements – In electric water heaters, a damaged heating element can significantly slow heating time. Gas models may have burner issues affecting performance.
• Poor Tank Insulation – Older or uninsulated tanks lose heat quickly, forcing the system to work harder.
• Incorrect Thermostat Settings – If your thermostat is set too low, your water heater may never reach the desired temperature.
• Long Pipe Runs – The farther hot water has to travel, the longer it takes to reach your faucet or shower.

Bloomington-Normal Special Opportunity: If you are noticing slow heating times, local hard water scaling is almost always the culprit. To help you get to the root of the problem, Covenant Plumbing is currently offering FREE Water Testing with any plumbing appointment to check the exact mineral levels entering your system. To lock in this special, simply click the “Schedule Service” button in the top right corner of your screen and mention this offer to our team!

Professional Water Heater Repair vs. DIY: When to Call a Bloomington-Normal Plumber

If you are living in the Bloomington, Normal, or McLean County area, a slow-heating water heater is often caused by our highly mineralized municipal water supply. Over time, hard water deposits heavy calcium and lime scale at the bottom of your tank. This creates a thick barrier that literally cooks the sediment instead of heating your water, causing those strange popping noises in your basement and forcing your system to run constantly. If a simple tank flush doesn’t restore your hot water, it’s a sign that internal components or heating elements need professional attention before the tank fractures completely.

You can take several steps to improve heating efficiency and get hot water faster.

Step 1: Check Your Thermostat Settings

Make sure your water heater thermostat is set between 120 and 140 degrees. If the setting is too low, your system won’t heat efficiently. During Bloomington-Normal’s winter months, you may need to raise the temperature slightly to compensate for colder incoming water.

Step 2: Inspect for Insulation Issues

Run your hand along the exterior of the water heater. If you notice cold spots, the tank may be losing heat due to poor insulation. Installing a water heater blanket can help retain heat.

Step 3: Flush Out Sediment Buildup

If your home has hard water, mineral buildup in the tank could be slowing heat transfer. Try draining a few gallons from the bottom of the tank to check for sediment.

If the water is cloudy or filled with debris, a full system flush may be needed.

Cold Showers Can’t Wait! Is your water heater heating slowly? You can resolve this issue today without waiting around. Just click on the “Schedule Service” button on the top right of this page to instantly lock in a priority water heater diagnostic appointment with a licensed Covenant Plumbing technician, or call our local team directly at 309-340-1403 for fast service!

When to Call a Professional

If your water heater still isn’t heating properly after basic troubleshooting, a professional plumber can diagnose and fix the issue.

Call an expert if you notice:

• Unusual noises like popping or rumbling from the tank (a sign of sediment buildup).
• Leaks or standing water around the base of the unit.
• Persistent temperature issues even after thermostat adjustments.
• Pilot light or burner problems in gas water heaters.

A licensed plumber can flush your tank, inspect gas burners or heating elements, and check for hidden issues affecting performance. They can also test the pressure relief valve and other safety components to ensure your system is operating safely.

Prevent Future Water Heater Issues

Regular maintenance helps prevent slow-heating problems and extends your water heater’s lifespan. To keep your system running:

• Schedule annual plumbing inspections before winter to catch potential issues early.
• Flush the tank at least once a year to remove sediment buildup.
• Consider installing a water softener to reduce mineral deposits.

What If It’s Time for a Replacement?

If your system is past its prime and a repair won’t cut it, we have exclusive local specials available right now to take the financial stress out of your replacement:

• Take $250 OFF a brand-new, energy-efficient Tankless Water Heater installation—giving you endless hot water that never runs slow.

• Flexible Financing Options that allow you to get a reliable new water heater installed for as low as $46 per month.

Please note that these seasonal specials cannot be combined with other offers.

Trust Covenant Plumbing for Expert Water Heater Repairs

If your water heater takes too long to heat up, don’t wait for the problem to get worse. At Covenant Plumbing, we provide fast, reliable water heater repairs tailored to the unique climate challenges in Bloomington-Normal.

To claim any of our active service specials, simply look up at the top right corner of your screen and click “Schedule Service“, or call us directly at (309) 340-1403! We will restore comfort, safety, and hot water to your home immediately!