The answer to 'why is my water heater low water pressure' is that there are several common causes, including sediment buildup, a faulty pressure regulator, or a problem with the water heater itself. Low water pressure can be caused by mineral deposits, a clogged inlet valve, or even issues with the home's plumbing system.
If you're experiencing low water pressure from your water heater, it's important to first check the pressure at the heater's inlet and outlet. This can help you identify the source of the problem. If the issue is with the water heater, you may need to flush the tank, replace the pressure regulator, or have a professional plumber inspect and repair the unit.