Is It Dangerous if Your Water Heater Is Knocking?

If your water heater is making a knocking noise, it’s more than just a nuisance — a signal that demands immediate attention. Understanding and addressing this issue promptly for homeowners in Greater Grand Rapids can prevent potential damage and ensure your comfort. Schaafsma Heating & Cooling, with our century-long expertise, is your go-to source for diagnosing and fixing water heater problems efficiently.

Don’t ignore the knock — contact Schaafsma at 616-458-7304 to schedule your water heater repair service today.

What Does a Knocking Sound Mean? Explained

A knocking sound from your water heater shouldn’t be ignored. While not always a sign of imminent danger, it’s a clue that your system needs attention.

Sediment Buildup

Over time, minerals from hard water settle at the bottom of the heater’s tank, forming sediment. When water is heated, the sediment gets stirred, creating a knocking or rumbling noise as water bubbles.

Water Hammer

This occurs when the water flow suddenly stops or changes, causing shock waves through the pipes and leading to knocking sounds. This can happen when valves close quickly or the water supply is turned off and back on.

Heat Trap Issues

Some water heaters have heat traps or check valves to prevent the hot water from flowing backward through the plumbing, which can sometimes vibrate or rattle, producing a knocking sound.

Expansion and Contraction

As the metal tank heats and cools, it can expand and contract, which may cause popping or knocking sounds. This is usually normal but can be unsettling.

Signs Your Water Heater Needs Repair

Recognizing the signs of a water heater in distress is crucial for maintaining its longevity and efficiency. If any of the following is happening along with the knocking, it’s time to call Schaafsma:

• Knocking, banging, or popping sounds can mean sediment buildup, water hammer, or heat trap issues.
• Inconsistent water temperatures or a lack of hot water.
• Rusty or murky water can indicate corrosion or sediment inside the tank.
• Any signs of water leakage around the water heater tank should be taken care of immediately.
• An unexpected increase in energy bills means that your water heater has a leak or isn’t working optimally.

Choose Schaafsma for Water Heater Repairs

Why choose Schaafsma for your water heater repairs in Greater Grand Rapids? We’ve been in business for over 100 years, serving Michigan homeowners with first-rate water heater repairs. Our technicians are NATE-certified and have an A+ rating with the BBB.