15th November 2025

Water heater leaks can come from numerous causes, together with cracks from tank corrosion, mineral and sediment buildup, corrosion of inner components, free or damaged valves, leaky connections and overly excessive water strain.

How do sizzling water heaters work and the way lengthy do they final?

Commonplace water heaters maintain from 20 to 80 gallons of water, and so they work by releasing heated water from the highest of the tank whenever you activate a sizzling water faucet. Then, to exchange the launched sizzling water, chilly water enters the system via a dip tube on the backside of the tank. This ensures the water heater is at all times full

U.S. Division of Vitality Workplace of Vitality Effectivity & Renewable Vitality. Storage Water Heaters. Accessed Jul 8, 2024.

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Conventional water heaters for single-family properties usually final 10-12 years, and warmth pump water heaters can final so long as 13-15 years

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Water leaking from a water heater means there’s an issue that wants quick consideration. It’s possible you’ll must restore or substitute the unit (or the malfunctioning half) earlier than the water heater turns into additional broken or causes water harm to your property

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7 widespread causes of water heater leaks

Water heater leaks can stem from quite a lot of causes, some critical and a few simply repaired. Listed here are the most typical:

1. Tank corrosion cracks 

As water heaters age, rust can corrode the within of the tank, creating cracks that trigger the tank to leak. You could possibly patch small cracks as a short-term repair, however you’ll want to exchange the water heater earlier than too lengthy.

2. Tank cracks from mineral buildup

Sure water heaters include a 3rd glass-lined tank. With any such unit, hardened minerals might type deposits throughout temperature fluctuations, inflicting cracks within the glass, which result in water leakage. When this occurs, you’ll want to exchange the glass-lined tank, or in case your water heater is nearing the tip of its life, go for a brand new unit

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3. Tank cracks from sediment buildup 

Poorly maintained water heaters can crack from sentiment that accumulates on the backside of the tank. When you see any such leak, which could be from gentle to extreme, you’ll want to exchange the unit

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4. Anode rod corrosion

The anode rod helps appeal to and take away corrosive supplies from contained in the water tank. Nonetheless, the corrosive supplies also can corrode the anode rod to the purpose the place it’s nearly gone. When the anode rod has deteriorated to that extent, the tank turns into extra susceptible to cracks and leaks — and a leak can type within the house the anode rod used to fill. Monitoring the situation of the anode rod and changing it as wanted can lengthen the helpful lifetime of your water heater

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5. Free drain valve 

The drain valve is a valve you should utilize to empty and clear the water heater. It might loosen over time from steady use, inflicting leaks. You could possibly repair the leak by tightening the valve; nonetheless, in some instances, changing the valve could also be mandatory.

6. Free inlet and outlet connections

The inlet and outlet connections, which permit chilly water to stream into the tank and sizzling water to stream into your property’s fixtures, can loosen over time, leading to leaks close to the highest of the tank. Tightening the connections (or having a plumber achieve this) usually resolves this challenge.

7. Overly excessive strain and/or malfunctioning pressure-relief valves

Water heaters can leak when overly excessive strain leaves water nowhere to go however out via cracks. Widespread causes of elevated strain in water heaters are excessive temperature (water expands when heated) and strain valves that malfunction or grow to be free. If so along with your water heater, tightening the valve might clear up the issue, or the valve might should be changed.

What to do in case your water heater is leaking

In case your water heater is leaking, there are two steps you’ll be able to take instantly to forestall accidents and harm to your property:

  1. Shut off the water provide to the water heater. Your water heater might have a shut-off valve; if it doesn’t, you’ll want to make use of your property’s water shut-off valve.

  2. Shut off the ability provide to your water heater. You probably have a fuel water heater, shut off the fuel provide line to the unit. For an electrical water heater, flip off the breaker in your electrical panel.

As soon as these security measures are in place, then, you’ll be able to attempt to decide the place the leak is coming from and in case you ought to name in knowledgeable.

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