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Water Heater Leaking? What to Do Right Now
A leak can be a simple valve fix or a tank that needs replacing today. Where it's leaking from tells you which — and what to shut off first.
Do this first
Before anything else, stop the water and shut the heater down:
- Turn off the cold-water supply valve on top of the heater (turn the handle clockwise, or the lever a quarter turn).
- Electric heater: switch off its breaker at the panel.
- Gas heater: turn the gas control knob to "Off."
- Then call us — pooling water under the tank means it can fail suddenly.
What a Water Heater Leak Means
With a water heater leak, the location of the leak tells you almost everything. A drip from a fitting or valve up top is often a straightforward repair. Water pooling under the tank usually means the tank itself has corroded through — and that can't be repaired, only replaced.
Either way, water near a heater does not get better on its own, and a failing tank can go from a slow drip to a flood without much warning. The first move is to stop the water and the power or gas, then find the source. Here's how.
Where the Leak Is Coming From
From the bottom = tank corrosion
Water pooling under the tank usually means the inner tank has rusted through. Tanks can't be patched — this is a replacement, and sooner is better before it lets go.
Temperature & pressure (T&P) valve
The safety valve on the side discharges if pressure or temperature climbs too high. A dripping T&P can mean thermal expansion, a too-high temp setting, or a failed valve.
Drain valve or supply fittings
The drain valve at the bottom or the supply connections up top can loosen or fail. This is often a repair rather than a full replacement.
Condensation (not a leak)
On a new or hard-working heater, condensation can look like a leak. We confirm it is actually leaking before recommending anything.
Common Questions
Why South Shore homeowners choose Johnson Bros.
Talk to a licensed South Shore plumber
Tell us what's going on. We'll triage it and give you a clear next step — repair, replace, or a quick fix.
Need help fast? Call for urgent plumbing issues. Booking online is best when you want the next open appointment without waiting on the phone.
Can't talk right now? Get a callback.
How We Work
Clear communication, licensed work, and local support.
Licensed Plumbing Work
Massachusetts-licensed plumbing support backed by insured crews.
Fast Scheduling Updates
We tell you what timing is available and keep you updated if the schedule shifts.
Upfront Options
You get a clear explanation of the work and price before the job begins.
Repair-First Guidance
We help you understand whether repair, replacement, or follow-up service makes the most sense.
Talk to a licensed South Shore plumber
Tell us what's going on. We'll triage it and give you a clear next step — repair, replace, or a quick fix.
Call for urgent help now. Book online when you want the next available fit for your schedule.