Water Heater Leaking in Chicago? Where It's Coming From

With a leaking water heater, the location of the leak matters far more than the volume, because it decides whether this is a repair or a replacement. SAVA HVAC & Appliance Repair has serviced water heaters across Chicago and the North Shore since 2017. Water at the top of the tank usually comes from the inlet or outlet connections or a failing valve, and that is generally repairable. Water from the temperature and pressure relief valve means the system is discharging because pressure or temperature has exceeded a safe limit — the valve is doing its job and the cause behind it needs finding. Water seeping from the bottom of the tank itself normally means the tank has corroded through, and no repair puts that right. SAVA is family-owned and rated 4.9 stars across 150+ reviews.

Common causes of water heater leaking

1. Corroded tank (bottom of the unit)

The one that cannot be repaired. Every tank has a steel shell with a glass lining and a sacrificial anode rod protecting it. Once the anode is spent the lining fails and the steel corrodes from the inside out. When water appears from the base of the tank rather than from a fitting, the tank has perforated and replacement is the only honest answer. A slow weep at this stage is a warning — tanks that fail this way tend to fail completely, and a full tank on the floor is a much larger problem.

2. Temperature and pressure relief valve discharge

The T&P valve is a safety device that opens if temperature or pressure inside the tank exceeds safe limits. Water from its discharge pipe is the system protecting you from a genuinely dangerous condition. Sometimes the valve itself has failed; more often it is relieving real excess pressure caused by thermal expansion, a failed expansion tank, or a thermostat overheating the water. Either way it should never simply be capped or plugged.

3. Inlet or outlet connection

The threaded connections at the top of the heater loosen and corrode over time, particularly where dissimilar metals meet. Leaks here are usually slow, appear at the top of the unit, and are among the more straightforward repairs — provided they are caught before the water runs down onto the burner assembly or the electrical components.

4. Drain valve

The drain valve at the base is a common failure point, especially on older units where the valve body is plastic. It can weep continuously or seep only intermittently. It is easy to mistake for tank failure because the water appears at the bottom, which is exactly why the source needs confirming before anyone condemns a tank.

5. Failed expansion tank

Many Chicago homes have a closed plumbing system, which means heated water has nowhere to expand. An expansion tank absorbs that. When its internal bladder fails, pressure spikes every heating cycle and typically shows up as repeated T&P valve discharge. Replacing the relief valve without addressing this simply repeats the cycle.

6. Condensation rather than a leak

Not every puddle is a fault. A new or recently refilled heater, or one working hard in a cold basement, can produce condensation on the tank that drips to the floor and looks exactly like a slow leak. It resolves once the water reaches temperature. Distinguishing this from an early tank failure is worth doing before replacing anything.

What to tell us when you call

The more you can describe, the better the chance we arrive with the right part already on the truck. It helps to know:

1. Where is the water appearing — top of the tank, base, or the discharge pipe?
2. Is it a steady flow, a slow weep, or an occasional puddle?
3. Is the discharge pipe from the relief valve wet?
4. How old is the heater?
5. Has anyone noticed the pressure changing elsewhere in the house?

When to call SAVA

Water heaters rarely recover on their own, and the failure modes get more expensive the longer they run. A tank that is corroding ends in a leak, sediment that is left in place shortens the life of the unit, and a safety device that keeps shutting the heater down is reporting a fault that has not been fixed.

SAVA is a family-owned, EPA Section 608 Certified company serving Chicago and the North Shore suburbs since 2017. We service gas, electric, and tankless water heaters, identify the exact fault before any work begins, explain what we found and what it will cost, and give straight repair-versus-replace guidance on older tanks. Learn more about our water heater repair service.

Water heater brands we service

Plus most other residential tank and tankless water heater brands — if yours isn't on the list, call and we'll confirm.

Frequently Asked Questions