Water Heater Leaking From the Top: Fittings, Anode, or T&P Valve

A leak from the top of a water heater usually comes from the T&P (temperature & pressure) relief valve, the anode rod access plug, or the cold-inlet/hot-outlet fittings — not the tank itself, which is good news for your budget.

Illustration of water droplets collecting around a top-mounted fitting.

Step-by-Step Diagnosis

DIY SAFE
Dry the top of the tank and watch closely where water reappears

The T&P valve, the anode rod plug, and the two pipe fittings are the three usual suspects.
DIY SAFE
Check if the T&P valve is dripping from its discharge pipe

A T&P valve that’s actually doing its job (relieving excess pressure) will drip from the end of its discharge tube, not leak from its body.
DIY WITH CAUTION
Try hand-tightening the inlet/outlet fittings

A slow drip from a fitting is often just a loose connection or worn gasket.
PRO ONLY
If the T&P valve itself is leaking from its body, not just discharging

Replace it — don’t plug or disable a relief valve, ever.

FAQ

Is it dangerous if the T&P valve is dripping?

A little drip after the valve has relieved pressure can be normal. A valve that leaks continuously from its body needs replacement — never cap or plug it.

Written by HotWater Decoded — water heater repair specialists. Technically reviewed by a licensed technician on our team.

Sources

Standard T&P valve function and leak-source diagnosis