Job book · Entry 05

The water heater is leaking — first things first.

Water at the heater isn't always the tank failing — fittings and valves leak more often than tanks do. But treat any leak like it could be the tank, and shut things down first.

What it usually is

01A threaded fitting on top of the tank dripping — the connections, not the tank.
02The T&P relief valve opening on its own or seeping — it reacts to pressure and heat.
03The drain valve at the bottom weeping or knocked loose.
04Condensation forming on the tank during a cold startup, mistaken for a leak (common enough on gas units).
05The tank itself leaking at the bottom seam — the failure that ends the conversation.

Safe checks you can do now

Kill power first: flip the breaker for an electric unit; for gas, turn the control to pilot or off.
Shut the cold-water valve on top of the heater — the pipe feeding it, usually a quarter-turn handle.
Dry the area, lay paper towel under the suspected spot, and come back in an hour to see what's actually wet.
Look closely at whether water comes from the T&P discharge pipe or the drain valve before assuming the tank — both leak on their own.
If the shutoff at the heater won't stop the water, close the main shutoff at the meter.

Where this stops being DIY

Water coming from the tank shell itself means the inner tank has failed and the unit is on borrowed time — sometimes days — and the repair-versus-replacement conversation starts there. Valve and fitting leaks are fixable, but power and water are both involved, so most homeowners hand even those off. A seep that's already soaked the pan or the floor needs eyes on it the same day.

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House-age angle: Slab homes built from the 1990s on commonly carry the water heater in the attic with a safety pan and drain line — builder-dependent, but when one lets go upstairs, water travels through ceilings, so a rusty pan or a clogged pan line matters. Older homes with the heater at floor level usually show a leak as a puddle you catch early. In either placement, tanks commonly reach the end of the road somewhere in the 10-to-15-year range.

Is a leaking water heater an emergency?

Water from the tank bottom can go from seep to flood without much warning, and an attic heater shares space with your ceiling. Power off, water off, then decide — that order keeps it contained.

Can a leaking water heater be repaired, or does it need replacing?

Depends entirely on where the water is coming from. Fittings, the T&P valve, and the drain valve are replaceable parts; a leaking tank shell is not. What the job comes down to is which of those failed, access to the unit, and how far the water traveled.