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A thermocouple is a pretty simple device. It simply tells the control valve if heat is present. Most water heaters can use a universal thermocouple, provided it's the correct length. Getting one that's long enough for your appliance is crucial for success. However, some water heater models require model-specific thermocouples, which is why it's essential to take your existing one to the store to find the right match.

Unless you have previous plumbing experience or extensive experience with water heaters, you should avoid replacing your electric water heater yourself. This process involves disconnecting wiring and parts from the old water heater and reinstalling them onto the new one, among other difficult tasks. This job is best left to the pros to make sure that everything is connected correctly to avoid serious leaks or malfunctions.

The time it takes to replace a water heater depends on the complexity of the job. Expect your contractor to spend:

• One to three hours on a standard tank-style water heater replacement

• Two to three hours on a tankless water heater replacement

• Four to six hours replacing a tank-style water heater with a tankless water heater

• One hour for each additional parallel or point-of-use water heater

Your project will take longer if you’re switching fuel sources, upgrading to tankless, or relocating your water heater.

Not all homes are required by code to have water heater expansion tanks, though some cities, like Los Angeles, do. Sometimes, municipalities will require a code that asks homeowners to install an expansion tank if their water heater is on a closed system. A closed system setup without an expansion tank can place unnecessary stress on appliances and shorten their lifespan.