It's recommended that you have your water heater inspected by a professional at least once a year to keep it running properly. During a tune-up, you can expect a plumber to perform several tasks, including checking the inside and outside of the unit for any cracks, defects, or signs of aging. He or she will also drain the basin to remove any sediment that's building up and change the filters as needed. The professional will also check the hoses for any cracks.