Reading Your Water Heater Label
Before you book a repair or shop for a new heater, a minute with the label tells you the tank's age, size and fuel type. Those three facts shape most decisions.
Request a plumberFind the label
It's usually on the side of the tank near the top, or beside the gas control or the electrical cover. You may need a flashlight if the heater sits in a closet or garage corner.
The serial number
Most makers code the manufacture date into the serial number, often as a letter for the month and digits for the year, or the year first. Search the brand name with "serial number date" to decode yours.
Capacity
The label lists the tank size in gallons. If your household often runs out of hot water, the next heater may need more capacity or a better first-hour rating.
Fuel and power
Gas heaters list the input in BTUs and the gas type. Electric heaters list the voltage and element wattage. A plumber needs these to match a replacement or order parts.
What age tells you
Many tanks last around eight to twelve years. A heater in that range that leaks, rumbles or gives rusty water is worth planning to replace rather than waiting for it to fail.
Next step
Send the label details along with your request. See water heater service.
Other numbers worth noting
The label also shows the model number and, on many heaters, the first-hour rating. That rating tells you how much hot water the heater can deliver in a busy hour, which matters more than tank size when two showers and the dishwasher run in the same morning. Write these down before you ask for quotes.
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