Your Water Heater Is Talking. Here Is a Translation Guide.

A water heater is the rare machine that announces its own failure years in advance, in plain language, to an audience that has learned to ignore it. Hemingway would have admired the economy of it: the tank says one thing, means it, and is eventually proven right.

Here is the vocabulary, ordered from harmless to urgent.

The noises

Ticking and light popping on heat-up. Thermal expansion — pipes and tank moving as they warm. Harmless. Every house does it. This one is included so you can stop worrying about it.

Rumbling, like a kettle full of gravel. Sediment. A layer of mineral scale covers the tank floor, water flashes to steam beneath it, and the steam punches through. In Valley water this starts early. Caught in the first few years, a flush clears it. After that the sediment hardens into something no flush will move, and the tank floor cooks under it.

A kettle-like whine or screech. Usually a restricted inlet valve or, on electric units, an element scaling over. Cheap to fix now; it does not improve with seasoning.

Banging when a tap shuts — from the pipes, not the tank. Water hammer. Often a failing pressure regulator, which shortens the life of everything downstream, the heater included.

The other tells

• Hot water runs out faster than it used to. Sediment is occupying gallons that used to be water. A forty-gallon tank with six inches of scale is a thirty-gallon tank with a weight problem.
• Rust-tinted hot water — hot side only. The tank lining has failed and you are seeing steel. This is not a repair. This is notice.
• Moisture at the base, ever. A damp skirt is a leaking tank until proven otherwise, and it is almost never proven otherwise.

A tank failure is not a leak. It is forty to eighty gallons on the floor, followed by the supply line refilling the tank so it can continue.

The age question

In Phoenix water, eight to twelve years is the honest service life. Find the manufacture date on the serial-number sticker. Past year eight, every noise above moves one category up in urgency, and the sensible move is replacing on a Tuesday of your choosing rather than a Sunday of the tank’s.

If yours is rumbling, discolouring, or simply old enough to vote in tank years, we will give you a straight answer — flush it, part it, or replace it, priced flat before we start. And if it is currently making the eighty-gallon announcement, shut the cold inlet valve on top of the tank and call us now. We answer at the hours tanks prefer to fail.

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