The answer to 'water heater low water pressure' is that there are several common causes, including sediment buildup, a faulty pressure-reducing valve, or a problem with the water heater itself. Symptoms may include decreased water flow, lukewarm water, or inconsistent water pressure. Solutions can range from flushing the water heater to replacing the pressure valve or the entire unit.
In many cases, the cause of low water pressure from a water heater can be diagnosed and addressed through DIY troubleshooting. However, if the issue persists or you're uncomfortable working on the water heater, it's best to call in a professional plumber to inspect and repair the system.