How to Read Your Water Heater's Label

Where it is

Look on the side of the tank, often near the top or beside the gas control or the electrical cover.

How old is it?

The manufacture date is usually coded into the serial number. Many brands use the first digits for the year and month or a letter for the month. If it's hard to read, a photo of the whole label is enough.

How big is it?

Capacity is listed in gallons. A 40- or 50-gallon tank is common for a family home. The first-hour rating shows how much hot water it delivers in a busy hour.

Gas or electric?

The label states the fuel: natural gas, propane or electric. Gas heaters have a burner, gas valve and vent pipe; electric ones have element covers on the side.

Why it helps

Knowing the age tells you whether repair or replacement makes more sense. Knowing size and fuel lets the plumber bring the right part or replacement.

Next step

Include a photo of the label with your request. See water heaters.

The relief valve

The temperature and pressure relief valve sits on the top or side of the tank with a pipe running toward the floor. If it drips, has rust around it or the discharge pipe is missing, mention it in your request, because it's the main safety device on the heater.

Venting

On gas models, look at the vent pipe on top. It should be firmly attached and slope upward to the chimney or wall. Rust, gaps or soot around the draft hood are worth reporting too.

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