How do I Fix a Leaking Hot Water Heater?

by | May 6, 2026

To fix a leaking hot water heater, you must prioritize safety by immediately shutting off the power (at the circuit breaker for electric units) or the gas supply (using the gas valve for gas units). Next, shut off the incoming cold water supply valve to prevent further flooding.

Once the unit is safe, follow these steps to address the leak:

  1. Locate the source: Dry the area and monitor for 30 to 60 minutes to identify if the leak is coming from the pressure relief valve, drain valve, fittings, or the tank itself.
  2. Tighten connections: If the leak is at the top fittings or inlet/outlet connections, use an adjustable wrench to gently tighten them clockwise.
  3. Flush sediment: If sediment buildup is causing issues, attach a garden hose to the drain valve and flush the tank until the water runs clear. This can resolve rumbling and minor bottom-tank leaks.
  4. Replace faulty valves: If the pressure relief or drain valve is failed, it must be replaced. Partially drain the tank before unscrewing the old valve and installing a new one with thread sealant.

Note that if the tank itself is corroded or leaking from the bottom seams, it likely requires professional replacement rather than a repair. Never attempt DIY fixes on internal pressure components.

Related FAQs

Northstar Heating & Cooling

Request Service Online

Let us help you today!

Where are you located?

Please enter your postal code so we can check if we provide service in your area.

truck-icon
chat-icon

Offer Title

Text here...

Request more info

Complete the form below and our team will contact you as soon as possible. If you want to talk to us now, call 403-973-0717

Offer Disclosure