A tank talks before it fails. Popping and rumbling are sediment: minerals settled on the tank floor insulating the water from the burner or element, cooking the tank bottom and wasting fuel. Lukewarm water that runs out fast is an element, a dip tube, or a tank losing its fight with that same sediment blanket.
Littleton's water and altitude write its heater guide: mineral sediment cooking on the tank floor, pressure and venting read at 5,500 feet, and finished basements deciding the pan and drain questions before the tank's price is discussed. The fifty percent rule still governs repair versus replace, with the local correction that a tank's failure plan, where its water goes, is part of the replacement scope in this city's basement homes.
Age frames every decision. Tank heaters commonly serve 8 to 12 years; anode rods sacrifice themselves in the first years and, unreplaced, leave the tank itself to corrode. Rusty water on the hot side only, moisture at the base fittings, and a roar like a kettle are the end approaching in that order.
The 50 percent rule settles repair versus replace: a repair near half the price of a new installed tank ($1,200 to $3,500 in published guides) on a unit past 10 years is usually money into a tank with little life left. A body leak settles it absolutely; tanks do not get patched.
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