Know your system
Gas, electric, tankless and hybrid faults differ
Gas units can have pilot light failures, ignition problems and burner issues. Electric units more often involve heating elements and thermostats. Tankless systems may display error codes, and hybrid heaters combine heat pump components with electric heating.
Knowing the type narrows the possibilities, but similar symptoms can come from different parts. Share the model details if you have them, and describe whether the problem is no hot water, inconsistent temperatures, popping and rumbling, rusty water or hot water that runs out quickly.
