Water Heater Installation, Repairs & How Tos

Hot water fails on its own schedule. A puddle spreading under the tank on a Sunday morning, a shower that turns cold four minutes in, or a pilot light that catches and then dies. The first real question is whether the unit is worth fixing at all, and that usually comes down to its age, which the serial number on the label will tell you.

Most of the work is repair. Replacing a thermocouple, a heating element, a thermostat or a gas control valve, swapping a spent anode rod, testing the pressure relief valve, and flushing the sediment that makes a tank pop and rumble. Rotten egg odor, cloudy hot water and air in the hot line each trace back to a specific cause. Tankless units add a layer of their own, with error codes on Rinnai, Navien, Noritz, Rheem and Bradford White models that point straight at the fault.

Replacement is the other half. Tank or tankless, gas or electric, and whether a hybrid heat pump model earns the extra height it needs. Then comes sizing for how many showers run back to back, direct vent against power vent, the right breaker for an electric unit, an expansion tank or a recirculation pump, and how brands like Rheem, A.O. Smith, Bradford White and State compare once warranty and parts availability are on the table.