- A clogged pipe or tankless coil can cause the pressure to gradually or suddenly drop in your hot water tank and also affect water flow from outlets. InspectAPedia states that when you turn on the hot water tap and discover the water flow fluctuating from strong to weak, it usually indicates a block. Use an acid flush, available at your local hardware store, to clear hot water pipes and the tankless coil of rust, mineral deposits and debris that may be restricting water flow into and out of your tank. If your hot water tank pressure remains low once you complete the flush, you may need to replace the tankless coil. It's possible that the tankless coil is permanently damaged by rust or mineral residue.
- A faulty control valve can cause a sudden pressure drop in your hot water tank. A breakage or obstruction in the control valve can prevent water from entering your hot water tank. If you turn on multiple hot water taps throughout your home and water flow is strained, it's probably due to a defective or impaired valve. Contact a plumber to inspect your hot water tank and ensure its components are in good working order.
- InspectAPedia states that you can enhance hot water pressure and flow in your home by installing a larger water supply pipe. A larger pipe will increase water pressure and allow more water to flow through pipes to accommodate household demand. However, you should only upgrade the water supply pipe size if you do not have a tankless coil to heat water for your home, since the pipe size has no effect on the total volume of hot water your system provides.
- Ask the Builder states that people often accept low water pressure as a problem than cannot be fixed. Yet, in most cases, the issue can be resolved once its cause is identified. Do not allow abrupt changes in water pressure to go unchecked. Low water pressure is not only a nuisance, but can indicate a problem with your hot water tank that, unaddressed, can worsen over time.
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