Why Is My Water Heater Leaking? Common Causes and Fixes

Plumbing services

A leaking water heater is a problem no homeowner wants to face. Not only does it cause water damage, but it can also disrupt your daily routine and hint at a more serious issue. Fortunately, understanding the causes and knowing what to do can save you from costly repairs and help extend the life of your system.

Whether you're dealing with a small drip or a major puddle, knowing when to call a professional plumber or consider heating installation is essential. Let’s take a closer look at why water heaters leak and how you can fix or prevent the problem.

Common Signs Your Water Heater is Leaking

Before you begin troubleshooting, you need to identify whether the water heater is truly leaking. Here are a few tell-tale signs:

  • Puddles of water near the base of the unit

  • Rust or corrosion around the tank

  • Dripping water from valves or connections

  • Reduced water pressure or temperature

  • Strange noises like popping or hissing from the unit

Spotting these early can help prevent further damage.

1. Loose or Faulty Drain Valve

One of the most common reasons for a water heater leak is a loose drain valve. This valve is used to flush the tank during maintenance, and over time, it may become loose or damaged.

Fix:

  • Try tightening the valve gently with a wrench.

  • If it continues leaking, the valve may need to be replaced.

  • Always hire a licensed plumber if you're unsure.

2. Corroded Water Tank

Water heaters are made to last, but over time, sediment builds up and causes internal rusting. Once the tank corrodes, leaks can form in the body of the unit.

Fix:

  • Unfortunately, a corroded tank cannot be repaired.

  • Replacement is the only option.

  • Consider hiring HETAS qualified installers if you’re switching to an energy-efficient log burner or wood burning stove installation for a more sustainable heating solution.

3. Faulty Temperature & Pressure Relief (T&P) Valve

The T&P valve helps release pressure if the tank becomes too hot or the pressure gets too high. If this valve malfunctions or becomes blocked, it may leak.

Fix:

  • Turn off the heater and test the valve.

  • If it leaks continuously, it should be replaced immediately.

  • Always ensure the replacement meets gas safety certificate standards.

4. Leaky Inlet and Outlet Connections

Cold water enters your water heater through the inlet pipe, and hot water exits through the outlet pipe. If these connections are loose or worn out, leaks may occur.

Fix:

  • Tighten the fittings using a spanner.

  • If worn out, replace them with new connections.

  • Call a plumbing service provider if you're unsure about the fittings.

5. Excessive Pressure in the Tank

Water heaters operate under pressure. However, if the water pressure is too high, it can strain the tank and cause leaks around the valves and pipes.

Fix:

  • Lower the temperature to reduce internal pressure.

  • Install a pressure-reducing valve (PRV).

  • Consult with a heating engineer for a full system inspection.

6. Cracks in the Internal Tank

If your water heater is making strange noises and leaking from the bottom, it might have internal cracks due to thermal expansion.

Fix:

  • Turn off the heater and call a plumber.

  • Internal tank damage means the unit may need full replacement.

  • Consider upgrading to a modern boiler installation for better efficiency.

7. Worn Gaskets in Electric Water Heaters

Electric water heaters have heating elements secured with rubber gaskets. Over time, these gaskets can wear out and cause water to leak from the side of the tank.

Fix:

  • Turn off the power.

  • Remove the heating element and replace the gasket.

  • Always hire qualified professionals if unsure about electrical safety.

8. Old or Ageing System

Just like any other appliance, water heaters have a limited lifespan—usually around 8–12 years. If yours is leaking and reaching the end of its lifespan, it might be time to replace it.

Fix:

  • Inspect the unit's age (usually marked on the serial number).

  • Consider replacing it before major leaks occur.

  • Speak to trusted bathroom fitters or heating installation experts for integrated upgrades if needed.

Prevention Tips to Avoid Leaks

Taking a few preventive steps can go a long way in keeping your water heater in top shape.

  • Flush your water heater annually to remove sediment.

  • Schedule regular inspections from plumbing services.

  • Check the T&P valve every six months.

  • Ensure correct installation by HETAS qualified installers.

  • Maintain appropriate pressure levels using a PRV.

  • Get regular gas safety certificates to ensure compliance and safety.

When Should You Call a Plumber?

While some minor leaks can be fixed with basic tools, it’s best to contact a professional plumber when:

  • The leak comes from the tank itself.

  • You suspect corrosion or structural damage.

  • You have no hot water or fluctuating temperatures.

  • You're unsure of the source of the leak.

Professionals offer comprehensive plumbing services and can guide you on the next best steps, whether that’s repair, boiler installation, or full heating system replacement.

Final Thoughts

A leaking water heater is more than just a nuisance—it’s a potential hazard that requires immediate attention. By understanding the common causes and solutions, you can take swift action to prevent water damage and high repair bills.

Whether you need help with boiler installation, gas safety certificates, or a complete heating system upgrade, contacting a qualified heating engineer or plumber is the safest and most efficient way forward.

Don’t wait for a small leak to turn into a flood. Keep your home warm, dry, and energy-efficient by staying on top of your plumbing and heating maintenance needs.

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