If your water heater has suddenly stopped producing as much hot water as normal, then you need to work out where the problem lies. Sometimes, this happens if you use more hot water than usual, say if you have guests staying in your home who take regular showers or baths. Other times, the heater itself has a problem. Why do water heaters sometimes stop producing enough hot water?
Sometimes, your water heater's thermostat control affects how much hot water you get out of the system. If someone has accidentally moved the thermostat to a lower setting, then your water won't be as hot as it was. If this happens, then moving the control up again should fix the problem. Wait a while to allow the system to adjust to the new setting, and then see how much hot water you get.
If the thermostat hasn't been moved, or if changing the control makes no difference, then the control itself might be faulty. You might need to repair or replace it.
Your water heater's tank gradually collects sediment as it works. If you have a lot of particles in the system, then they can prevent the heater from working to optimum efficiency.
For example, an excess of sediment can collect around heating elements. This can stop the elements from getting direct water contact. So, they can't create the right levels of heat to supply enough hot water for your needs. If you have a lot of sediment in a tank, then it also reduces space for water.
If you have sediment problems, then you can drain the system to clean it out. Once the heater is clear again, your hot water volumes should improve.
Heating Element Problems
Your system contains one or more heating elements. These parts create the heat that warms up the water. However, elements don't last forever. If one develops a fault or loses its connection, then it can't heat water effectively.
While a complete element breakdown often results in no hot water at all, some faults cut in and out. So, you get some hot water but not enough. Generally, you need to replace a faulty or broken element.
If you aren't sure why you aren't getting enough hot water, then call a water heater repair service. They can work out where the problem lies and help you fix it quickly and efficiently.