A problem with your water heater is something that can be very inconvenient, especially during the winter. A malfunctioning system can make life extremely uncomfortable during this time. This is one plumbing emergency that you cannot afford to ignore. Water heaters often give signals to show that you need repair. Call a plumber if you notice any of these signs. Lack of Hot Water A lack of hot water is a major sign that you need to call in for repairs very quickly.