Why Is My Water Heater Leaking? Common Causes & Quick Fixes
- K H
- Oct 14
- 2 min read
A leaking water heater is more than just an annoyance — it’s a warning sign that something is wrong. If left untreated, even a small drip can lead to water damage, mold, or full system failure. But not all leaks are catastrophic. By knowing the common causes and what you can do about them, you can avoid costly damage and decide whether to call a pro.
Common Causes of Water Heater Leaks
Loose or Corroded Connections - The inlet/outlet pipes, fittings, or adapters can loosen over time or corrode, allowing water to seep out. Fixing or reseating these connections often addresses minor leaks.
Faulty Drain Valve - The drain valve is used during maintenance (flushing). If it is loose, damaged, or not fully closed, it can drip from the bottom of the tank.
High Water Pressure / Overpressure - When the pressure inside the tank gets too high, water can leak from seams or pressure-relief mechanisms. A malfunctioning temperature & pressure (T&P) relief valve often shows this issue.
Malfunctioning Temperature & Pressure (T&P) Relief Valve - The T&P valve is designed as a safety valve. If it’s stuck, loose, or damaged, it may continuously release water.
Sediment Buildup & Corrosion - Over time, minerals in water settle at the bottom of the tank. This sediment can overheat or wear through the tank lining and cause leaks or cracks. In older tanks, corrosion from within often leads to leaks.
Cracked or Failing Tank Shell - If the tank itself develops a crack or the inner lining is compromised, the leak is structural. In most cases, this means replacement — not repair.
What You Can Do Immediately
Turn off the power (electric or gas) and shut off water supply to prevent further damage.
Inspect the leak source — check connections, valves, and the base of the unit.
Tighten loose fittings gently (don’t overtighten).
Flush the tank if sediment buildup seems likely – once or twice per year is recommended. (In Las Vegas and surrounding areas, mineral-heavy water accelerates corrosion, and can cause sediment build-up and even leaks. These hard-water issues are one reason water heaters often need to be replaced sooner here than in other parts of the country.)
If the leak continues or you cannot locate the source, stop tinkering. Call a professional.
If your water heater is leaking and you’re in the Las Vegas metro or surrounding Clark County areas, don’t wait. Delay can lead to costly damage and repairs to more than the water heater. At Vegas Pro Plumbing, we offer fast diagnostics, same-day repairs, or full replacements depending on your situation. Our licensed experts will give you an upfront quote — no surprise charges — and get your hot water flowing again safely.
Final Thoughts
A water heater leak isn’t always a disaster, but it’s never something to ignore. Many leaks stem from minor issues like loose valves or worn parts that a professional can fix. But if your tank itself is damaged, replacement is often the only option. Either way, prompt action saves money, prevents damage, and gives you peace of mind.
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