If your water loses heat quickly, doesn't heat up at all, or has other issues—something may be wrong with your water heater. Most water heater problems can be easily identified; some can even be fixed without the aid of a plumber. If you're experiencing issues with your water heater, try identifying and repairing the problem yourself before calling a professional.
Use a continuity tester to check the upper and lower heating elements to see if they're working properly. A continuity tester identifies a short-circuited or burned-out heating element by reading the amount of electricity it puts off. If they are malfunctioning, you can find affordable replacement parts at the hardware store and change the parts yourself using a few tools found in most tool sheds.
Identify where the leak is coming from. If the leak is coming from a connector or pipe, either try tightening the leaky part, or disconnecting the tank from the water supply and replacing it yourself. However, if the tank itself is leaking, you'll need to have a new water heater professionally installed.
Make sure the water shut-off valve is open if the hot water pressure is low throughout your house. Sediment buildup inside the tank could also cause low water pressure. You can get rid of buildup by draining the water heater tank and flushing out the sediment.
Readjust the thermometer on your water heater to ensure that it's set to the correct temperature. If it's set to the right temperature, but the water is still too hot or cold, you may need to replace the thermometer and the heating element.
Start by draining the tank to flush out any buildup in the tank. Built-up sediments can come in contact with the heating element, causing loud, whining noises. If the noises continue, your heating elements are likely burning out, in which case you'll need to replace them yourself or have them replaced by a professional.
Drain the tank, fill it with about 32 ounces of bleach and flush it again, or increase the water temperature to about 160 F for about an hour. Both methods should kill any odor-causing bacteria and remove rust inside the tank. Otherwise, you'll have to replace the anode rod that kills bacteria and removes rust. You can replace the rod yourself, but it does require some skill and a few heavy-duty tools; hire a professional if you don't have much plumbing experience.