Why Your Tub Faucet Is Leaking Hot Water

Why is my tub faucet leaking hot water? It's frustrating to notice a continuously dripping faucet, even when the handles are firmly turned off. It quickly becomes more than just a nuisance — it will drive up energy bills, waste large amounts of water, and eventually lead to deeper plumbing damage.



King's Services has your team of trusted plumbers in Winnipeg, Manitoba, and we'd like to explore the most common causes of this problem and what you can do about it. 

Common Causes of a Hot Water Drip in Your Tub

Consider a persistent hot water leak as a sign of something wrong inside your faucet. Whether you have an older home in River Heights or a newer build in Sage Creek, the underlying issues are often the same.

These are the causes we typically encounter:

Worn-Out Washers

If you have a traditional two-handle faucet, the problem may be a worn-out washer. Washers are simple rubber components that press against a valve seat to shut off water flow. Over time, exposure to hot water causes them to become brittle, cracked, or distorted. The mineral-rich water in and around Winnipeg aggravates washer damage. 

Even if the cold side works fine, a degraded washer on the hot side lets water sneak past and drip from the faucet. Replacing the washer is a simple and inexpensive fix, especially if caught early.

Faulty Cartridges

Have you asked, "Why is my tub faucet leaking hot water, even though I have a single-handle faucet?" Modern faucets use cartridges that control flow from the hot and cold water supply lines with a single handle. When internal seals or O-rings wear out, hot water can drip even when the tap is off.

You’ll often notice this issue in newer homes or bathrooms recently remodeled with modern fixtures. A new cartridge designed specifically for your faucet’s brand and model typically solves the problem.

Valve Seat Corrosion

The valve seat is the metal part inside the faucet where the washer or cartridge rests. Over time, mineral deposits and heat exposure can cause valve seat corrosion, especially in homes with hard water. This makes a tight seal impossible, leading to ongoing dripping even after a repair.

This could be the primary suspect in an older Winnipeg home with original plumbing. Your local expert plumber can resurface the valve seat or, if needed, replace it entirely.

Malfunctioning Stem Assembly 

You could have a compression faucet, which is a common feature in many Winnipeg homes built before the 1990s. If you have one and have already replaced the washer, the next likely cause is the stem assembly itself.

Over time, threads can wear down, or the stem can warp, preventing a proper seal. Your plumber can perform a stem assembly replacement to restore proper function and eliminate the hot water leak.

Could It Be a Systemic Issue?

"Why is my tub faucet leaking hot water even though all the equipment is new?" 

Excessively high water pressure puts strain on your plumbing fixtures, particularly the hot water side, which expands more under heat. Stress can cause internal components to break down prematurely. If leaks worsen when other appliances are off or at night, water pressure issues could be to blame.

Your plumber can test your home’s pressure across your entire plumbing system. Ideally, it should be between 40 and 60 psi. If it’s higher, your plumber may recommend installing or adjusting a pressure regulator.

How a Professional Handles a Plumbing Leak Diagnosis

At King’s Services, we approach each job with thorough, expert care. Here's how we typically perform plumbing leak diagnosis and repairs for a leaking tub faucet:

1. Faucet identification: We determine if your faucet is cartridge-based or washer-based.
2. Component inspection: We disassemble the faucet and inspect the washer, cartridge, valve seat, and stem.
3. Water pressure testing: We measure pressure at different points to determine if there are deeper systemic issues.
4. Targeted repair or replacement: Based on findings, we replace only what’s necessary to deliver a cost-effective and durable solution. 
   

Count on King's Services in Winnipeg 

King’s Services brings decades of local experience to every job. We know the Winnipeg region’s water quality, building codes, and common fixture types inside and out.



If you’ve been asking yourself, “Why is my tub faucet leaking hot water?" it’s time to act. The issue won’t go away on its own, and you shouldn’t have to live with a leak. Look at our other posts for coverage of related topics like troubleshooting bathtub drain noises.

Contact King’s Services today for prompt, courteous service!