Why Is My Bathtub Faucet Leaking Hot Water? 7 Reasons

why is my bathtub faucet leaking hot water

A leaking bathtub faucet isn’t just a nuisance, it’s a waste of water and energy, particularly when leaking hot water.

Dealing with a hot water leak promptly can save unnecessary utility bill increases and precious resources.

In this guide, we’ll explore the 7 most common reasons why your bathtub faucet might leak hot water, along with some practical tips on diagnosing and fixing these issues.

Let’s dive in and get the problem solved!

1. Faucet O-Ring and Washer Wear

First, let’s talk about what O-rings and washers are. These little components are the backbone of your faucet, keeping it tight and leak-free.

O-rings are rubber seals that fit between the various parts of your faucet, while washers are small, flat pieces typically made of plastic or metal.

They both play a crucial role in preventing water leakage. Like when I discovered a crack in my favorite mug, I realized the most minor break can cause a significant leak!

How to Inspect and Replace Them

Inspecting and replacing O-rings and washers might sound intimidating, but trust me, it’s doable. Switch off the water supply first – we don’t want surprise showers!

Next, take apart the faucet handle to reveal the stem. Notice the small rubber or plastic pieces? Those are the O-rings and washers.

If they’re worn out, they could be the culprits! The first time I replaced them, I was so proud of myself – it’s like performing minor surgery on your plumbing!

Preventive Maintenance Tips

To keep those O-rings and washers working smoothly, you can take a couple of preventive measures.

Regularly check for any signs of wear and tear – just like you would with your car’s tires. If you notice any issues, don’t hesitate to replace them.

Remember when I mentioned the crack in my favorite mug? I didn’t fix it right away, and it eventually broke. The same thing can happen with your faucet. So be proactive and keep those leaks at bay!

2. Worn-out Cartridge or Valve

Cartridges and valves are crucial internal faucet components like the O-rings and washers. Imagine them as your faucet’s heart and lungs, controlling the water’s flow and temperature.

Cartridges are usually found in single-handle faucets; valves are generally part of a two-handle setup. When I first learned this—I was flabbergasted that such small parts could be vital!

Signs of Wear and Tear

Identifying wear and tear in cartridges and valves can be a bit tricky. You might notice a constant drip, even when the faucet is off, or find it hard to adjust the water temperature.

Once, I had such a stubborn faucet! It wouldn’t turn off completely, no matter how hard I tried. Turns out, the cartridge was worn out.

Step-by-Step Replacement Guide

Replacing a faucet cartridge or valve might seem daunting, but it’s easier than you think—I’ve done it a few times! As always, first cut the water supply.

Then, remove the faucet handle. If it’s a cartridge you’re replacing, you’ll see it right under the handle, while a valve will be located in the base unit.

Carefully replace the faulty part with a new one, ensuring to fit it snugly into position. Screw everything back together, and voila! You’ve just given your faucet a new lease on life!

Remember to take it slow and steady, and refer to detailed guides or videos if unsure. It’s how I did it the first time, and it’s a great feeling knowing you’ve fixed it yourself.

3. Loose or Damaged Seals

Like a ship’s hull, faucet seals ensure everything is watertight. But these seals can loosen or get damaged over time, leading to leaks. Let’s delve into it, shall we?

Identifying Seal Problems

The first signs of a seal problem are usually small leaks from the base of your faucet. Once, I found a tiny puddle on my countertop every morning, and I couldn’t figure out where it was coming from.

After eliminating other possibilities, I finally realized it was a loose seal. Another indicator could be water seeping out when you turn on the faucet.

Re-sealing Techniques

Fixing a loose or damaged seal isn’t as intimidating as it sounds.

The first step is always to shut off the water supply, then I like to place a towel in the sink to prevent any dropped parts from disappearing down the drain.

Then, remove the faucet handle. You should be able to see the seal right there!

You’ll need to remove the old seal—sometimes, I use a small flathead screwdriver for this, but be gentle to avoid damaging anything else.

Now, it’s time to replace it. Apply a new seal firmly in place. I usually push it a little extra to ensure it’s snug.

Preventing Future Seal Issues

They say prevention is better than cure—a mantra I fully subscribe to. Regularly check your faucet for early signs of leaks; you might catch a loose seal before it causes any problems.

Another step I take is to avoid over-tightening my faucet handle. This way, I reduce the strain on the seal and extend its lifespan.

It’s a simple step that can save you time and effort. Remember, a well-maintained faucet is a long-lasting faucet!

4. Corroded Valve Seat

The valve seat is a crucial component of your faucet. It serves as a sort of resting place for the faucet stems, sealing the connection when your faucet is turned off.

Imagine it as a loyal gatekeeper, holding back the water when unnecessary. The first time I saw a valve seat, I was fascinated by how such a small piece could play a vital role in my faucet’s functioning.

Causes of Corrosion

Corrosion of the valve seat can occur due to several reasons. One of the most common culprits I’ve encountered is the consistent contact with water.

Over time, water, mainly if it’s complex or mineral-rich, can wear down the valve seat, causing it to corrode.

I’ve seen this happen in my home when I lived in an area with hard water. It was a frustrating discovery, but it taught me a valuable lesson about the importance of regular maintenance.

Valve Seat Repair or Replacement Options

Dealing with a corroded valve seat isn’t fun, but it’s not impossible. If the corrosion isn’t too severe, you might be able to clean and smoothen the valve seat.

I’ve had some success using a valve seat grinder for this. However, replacement might be the best option if your valve seat is heavily corroded.

I had to do this once when the corrosion was beyond repair. It was a bit of a task, but with the right tools and patience, I could replace the valve seat and restore my faucet to its former glory.

Remember, don’t be afraid to reach out to a professional if you’re not confident doing this yourself. Sometimes, a helping hand can make all the difference.

5. High Water Pressure

High water pressure might sound like a good problem – who doesn’t love a powerful shower, right?

But over time, I’ve learned that it can be pretty detrimental and may even shorten the life span of your appliances.

Effects of High Water Pressure

You might be surprised to learn that high water pressure can lead to several problems. I remember when my dishwasher suddenly stopped working.

I was puzzled until I discovered the culprit was high water pressure, which eventually forced a leak in my dishwasher’s supply line.

Not only did it damage my dishwasher, but it also led to water wastage and slightly higher utility bills.

Pressure-Reducing Solutions

There’s good news, however, that there are several ways to tackle high water pressure.

One of the best solutions I found was installing a pressure-reducing valve (PRV). This device regulates the water pressure entering your home.

I noticed a significant decline in water pressure after I installed the PRV. Don’t forget to get it installed by a professional, as I did, to ensure it is done correctly.

Maintenance to Regulate Water Pressure

And lastly, regular maintenance is essential to keep the water pressure at an optimum level.

I’ve habitually checked my water pressure using a simple device called a pressure gauge.

It’s an easy, DIY solution – you screw it onto a hose bib and turn the water on.

If the pressure is consistently over 60 psi, I know it’s time to call in a professional.

Don’t overlook maintenance – it has saved me from many potential plumbing disasters.

6. Faulty Temperature Regulator

Speaking from personal experience, I’ve realized the crucial role a temperature regulator plays in maintaining a comfortable and consistent water temperature. Let me share my insights.

As the name suggests, a temperature regulator controls the temperature of the water that comes from your faucets and shower.

This device ensures the water is neither hot nor cold, providing the right temperature for your needs.

I can’t tell you how great it feels to step into a warm shower first thing in the morning, and it’s all thanks to the reliable temperature regulator.

Signs of a Malfunction

However, a temperature regulator can malfunction like any other appliance in your house. Over the years, I’ve learned to recognize a few tell-tale signs.

For instance, if the water temperature fluctuates wildly or is consistently too hot or cold, it’s a dead giveaway that the regulator might be faulty.

I remember this one time when the water became scalding hot out of nowhere. Luckily, I noticed in time and managed to avoid a nasty burn.

How to Repair or Replace It

When my regulator started acting up, I tried to adjust it to see if the problem would resolve. Sometimes, it’s just a matter of recalibration.

But when that didn’t work, I knew it was time to call in the professionals. Replacing a temperature regulator isn’t a DIY job, at least not for me.

I called in a trusted plumber who replaced the faulty regulator with a new, high-quality one. Since then, I’ve been enjoying perfectly tempered showers every day.

Remember, it’s always best to consult a professional if you’re unsure about the repair or replacement process. Safety first!

7. Sediment Buildup in Pipes

Just like aging arteries can accumulate plaque, your home’s plumbing system can slowly collect sediment over time, an issue I’ve faced more than once in my old home.

This sediment consists of mineral deposits and tiny particles from your water supply. Over time, they settle at the bottom of your water heater and your pipe system.

Effects on Hot Water Flow

The gradual buildup of sediment can significantly affect your hot water flow, an issue I’ve encountered first-hand.

You might notice your showers turning lukewarm before you’ve even had a chance to shampoo your hair.

This is because the sediment takes up space in your water heater, reducing the amount of available hot water.

It can also clog your pipes, reducing water pressure. I remember one winter morning when my hot water was reduced to a trickle. It’s not the best way to start the day!

Steps to Flush Out Sediment

Flushing out the sediment from your pipes and water heater can be a bit of a process, but it’s worth it.

I usually start by turning off the water heater and letting it cool. I then attach a garden hose to the drain valve and run it to a suitable place where it can safely discharge hot water and sediment.

I open the valve and let the water run until it’s clear, usually about 10-15 minutes. It’s a bit of work, but the reward of a hot shower at full pressure is well worth the effort.

Remember to take necessary safety precautions or consult a professional if unsure about the process.


Hi! I’m Kobby, one of the co-owners of favoredstoneguides.com and the newest house owner in town. I’m a huge fan of most things natural. Over here on this site, I'm happy to share all the exciting hacks, tricks, and tips I have learned and continue to learn each day about taking care of natural stones.

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