It’s a cold winter morning, and you’ve switched on your geyser a few minutes before taking a bath so the water is ready when you need it. While waiting, you hear a popping or rumbling sound coming from the bathroom. You might ignore it the first time, assuming it’s just the geyser heating water, but if the noise keeps returning every time you switch it on, it’s worth finding out what’s causing it. Sediment buildup, scale on the heating element and plumbing issues can all make a geyser noisy.
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Here’s what could be causing the noise and when you should get your geyser checked.
Sediment buildup inside the tank
Minerals present in hard water can gradually settle at the bottom of a storage geyser. As these deposits accumulate, they can interfere with heat transfer. Water trapped beneath the sediment may heat up and form steam bubbles, producing popping or rumbling sounds as the bubbles collapse.
You may also notice that the geyser takes longer to heat water than it used to.
What to do: If the noise persists, ask a qualified technician to inspect the tank and clean it if necessary. The frequency of maintenance depends on water quality, usage and the manufacturer’s recommendations.
Read more: Best 10-litre geysers in India for a warm, comfortable winter
Scale on the heating element
If you live in an area with hard water, your geyser’s heating element can develop a layer of scale over time. As the deposits build up, you may hear a crackling or popping sound whenever the geyser heats water. The water may also take longer to heat, particularly if the buildup has become heavy.
What to do: Get a technician to check the heating element and clean it if scale has built up. If the element is damaged, it may need replacement. Avoid opening the geyser yourself.
Water pressure or plumbing problems
Sometimes, the noise does not originate inside the geyser at all. Loose pipes, faulty valves or changes in water pressure can cause vibrations, knocking or rumbling sounds.
If you hear the noise when opening a hot-water tap or when water starts flowing through the pipes, the plumbing could be responsible.
What to do: Get the pipework and relevant valves inspected by a plumber. Never disable or adjust the pressure-relief valve to stop the noise, as it is an important safety component.
Thermal expansion and contraction
Geysers and their connected pipes expand as they heat up and contract as they cool down. This movement can produce occasional clicking, ticking or light knocking sounds.
Such noises are not necessarily signs of a fault, particularly when they occur as the appliance starts heating or cools after use. However, loud or persistent banging should not automatically be attributed to thermal expansion.
What to do: Observe when the noise occurs. If it becomes louder or is accompanied by leaks or changes in heating performance, arrange a professional inspection.
A faulty component
A malfunctioning thermostat, damaged heating element or another internal fault may affect how the geyser operates. However, noise alone cannot confirm which component is responsible.
Look for other warning signs, including inconsistent water temperatures, repeated electrical tripping, water leakage or a burning smell.
What to do: Stop using the appliance if you suspect an electrical fault, notice sparking or detect a burning smell. Switch off the power supply if it is safe to do so and arrange for a qualified technician to inspect the geyser.
How can you prevent these noises?
Regular maintenance can help limit sediment and scale buildup, particularly in areas with hard water. Follow the manufacturer’s servicing recommendations and have the tank, heating element and safety components inspected when necessary.
If your geyser has a sacrificial anode rod, check the manufacturer’s guidance on inspection and replacement. Also, pay attention to changes in heating time, unusual sounds and water leakage rather than waiting for the appliance to stop working.
When should you worry about a noisy geyser?
An occasional light click may be harmless, but persistent popping or rumbling deserves attention. Get the appliance checked if it becomes unusually loud, takes longer to heat water or develops a leak.
The bottom line: Sediment and scale buildup are common possible causes of popping or rumbling in storage geysers, but plumbing issues and faulty components can produce similar sounds. If the noise persists or the appliance shows other signs of trouble, get it inspected instead of assuming that the sound is normal.
Read more: Best 15L geysers to buy this festive season: Top picks for every home
Vikhyat Rishi is the Chief Copy Editor at Digit, where he covers home appliances. His work spans reviews, buying guides, comparisons, features, and explainers across the category. Before joining Digit, he worked with Beebom, Smartprix, and iGeeks, covering smartphones, computers, software, gaming, and consumer technology. His work combines editorial experience with a focus on practical insights and real-world product usage. View Full Profile