Six Reasons Why Water Heaters Fail August 22, 2025

It's no fun going without hot water. But like nearly every other appliance in your house, water heaters fail. And that can lead to cold showers — or even worse, a water leak.

Here are 6 telltale signs you have a failing water heater:

• You only have cold water.
• Your water gets warm, but never hot.
• Your water heater makes a rumbling noise.
• Your hot water is rusty, muddy or discolored.
• Your water has a metallic smell or taste.
• Water is leaking around your water heater.

If any of these symptoms sound familiar… it's probably time to call a plumber and Monona Plumbing & Fire Protection is happy to help!

Wondering why your water heater is failing? Here are some of the reasons – and what you can do help prevent a failure:

• Internal rust: Sacrificial anodes are highly active metal rods that help prevent your water heater from corroding. Anode rods are consumed in the place of the metal they protect – hence the name "sacrificial." Over time, they need to be replaced. They typically last several years, but it's a good idea to check your anode rods every year. If they look worn down, it's time to replace them.
• Sediment buildup: When water is heated, mineral deposits separate and settle onto the bottom of your water heater tank. Sediment builds up over time, reducing your water heater efficiency and eventually causing damage. This is especially an issue if you have hard water. The fix: Flush your water heater at least once a year.
• High water pressure: Water pressure that's too high can damage your water heater, as well as your pipes and other appliances. If you notice water leaking from the overflow pipe on the side of your water heater, you may have an issue with excessive pressure. Keep the water pressure on your heater no higher than 80 psi, and consider replacing your temperature and pressure (T&P) relief valve.
• Corrosive fumes: In order for combustion to occur, water heaters need to draw in air. Problems can occur if the air quality is poor. Especially dangerous is corrosive air, which can corrode your tank and lead to water heater failure. Keep corrosive substances like ammonia and bleach far away from your water heater.
• Wrong size heater: Water heaters come in a variety of sizes to accommodate the water usage of all the people and appliances in your home. If you buy a water heater that's too small for your needs, it will need to work more than it should – and that can lead it to breakdown from overuse. Talk with a plumber or appliance expert to make sure you buy a water heater that's the right size for your household.
• Old age: Water heaters typically last about 8 to 12 years. Any longer than that, and you're probably on borrowed time. If you're having issues with rust, a bad heating element or a pilot light that won't stay lit… old age may be the problem. If your water heater is at the end of its life span, consider proactively replacing it with a newer, more energy-efficient model.