The answer to 'water heater making gurgling noise' is that a gurgling or rumbling sound coming from your water heater is usually a sign of sediment buildup in the tank. This can happen over time as minerals and debris accumulate at the bottom of the tank, reducing the heater's efficiency and potentially leading to more serious issues.
Some common causes of a gurgling water heater include: sediment buildup, mineral deposits, or air pockets in the tank. Symptoms may also include reduced hot water output, longer heating times, and strange smells or tastes in the water. To address the issue, you may be able to flush the tank to remove sediment, but if the problem persists, it's best to call in a professional plumber to inspect and repair the water heater.