Tags DIY Projects

Animals & Plants Arts & Entertainment Auto Beauty & Health Books and Literature Business Electronics Engineering & Technology Food & Drink History Hobbies Jobs & Education Law & Government Math People & Society Science Social Studies Sports Travel & Places

0

Subjects>Hobbies>Interactive Hobbies

Why is my hot water pipe knocking and how can I fix it?

Juana Sporer ∙

Lvl 10

∙ 2mo ago

Updated: 2/20/2025

The knocking sound in your hot water pipe is likely caused by trapped air or water hammer. To fix it, you can try bleeding the air out of the pipes or installing water hammer arrestors. If the problem persists, it's best to consult a professional plumber for further assistance.

AnswerBot

∙ 2mo ago

Still curious? Ask our experts.

Chat with our AI personalities

Taiga

Every great hero faces trials, and you—yes, YOU—are no exception!

Chat with Taiga

Rafa

There's no fun in playing it safe. Why not try something a little unhinged?

Chat with Rafa

Devin

I've poured enough drinks to know that people don't always want advice—they just want to talk.

Chat with Devin

Add your answer:

Earn +20 pts

Q: Why is my hot water pipe knocking and how can I fix it?

Write your answer...

Submit

Still have questions?

imp

Trending Questions

Is the toilet leaking from the hose? What are the benefits of having a room heater and air conditioner in the same unit? What are the differences between PVC and EMT conduit and which one is more suitable for my electrical wiring project? Why does the water level in the toilet bowl drop slowly? What is the best way to set fence posts for a sturdy and long-lasting fence? How effective is a carbon dioxide mosquito trap in reducing mosquito populations? What are the benefits of using a boiler and hot water heater combo system in a residential setting? How can I hang a valance effectively? How can I test an electric water heater thermostat to ensure it is functioning properly? Can you mount a TV over a gas fireplace safely? How can I remove the stopper from a bathroom sink? How can rubber gloves protect against electricity? Is the PVC drain pipe leaking at the joint? How do I properly install a Moen sink stopper in my bathroom sink? Why is my washing machine vibrating excessively during the spin cycle? How can I prevent water from accumulating on windows? What are some alternative options to a retaining wall for stabilizing sloped terrain? Why did my ceiling fan suddenly stop working? What are the common causes of drywall blisters and how can they be prevented or repaired effectively? What is the cheapest way to replace a sewer line?

Related Questions

Hot water barely comes out of faucet cold water works fine how do i fix?

If shut off the hot water valve then you take off your supply line from your hot water valve to your faucet and then turn your hot water valve on slowly (with of course a bucket or something to collect the water under it) and if you can see you have water pressure and flow then most likely the problem would be in your faucet on the hot side. If you have no pressure or flow when you turn the hot valve on then it could be debris plugging your hot water pipe or your hot water service valve (angle stop, straight stop) which older galvanized pipes are known to do so. To fix the problem you would need to find out where the problem is then either fix or replace the faucet or replace the angle/straight stop or try back flushing the hot water pipe and or replace the pipe with pex or copper pipe.

Hot water pipe or cold water pipe which will rust first?

Hot water pipe rust first as compared to the cold water pipe for the same chemical composition of the water.

Which pipe goes to hot water heater?

Cold water pipe.

Why are my hot water pipes knocking and how can I fix this issue?

Hot water pipes may be knocking due to a phenomenon called water hammer, which occurs when water flow is suddenly stopped or redirected in the pipes. This can be caused by factors such as high water pressure, loose pipes, or a malfunctioning water heater. To fix this issue, you can try reducing the water pressure, securing loose pipes, or installing a water hammer arrestor to absorb the shock waves. If the problem persists, it may be best to consult a professional plumber for further assistance.

Why is my kitchen sink hot water not working?

There could be several reasons why your kitchen sink's hot water is not working. It could be due to a malfunctioning water heater, a problem with the hot water valve, a blockage in the hot water pipe, or a faulty faucet. It is recommended to check these components or consult a professional plumber to diagnose and fix the issue.

Why does it take 90 seconds to get hot water from tank to faucet?

That's just how long it takes to get the water that is sitting in the pipe out. Unless you have a circulating pump on the line so that there is always hot water at the faucet, it always takes a bit of time for the water to get hot. The hot water is in the tank, not the pipe connecting it to the faucet. There is nothing in the pipe to keep the water hot.

Why are my pipes knocking when I use hot water?

The knocking sound in your pipes when using hot water is likely due to thermal expansion. As hot water flows through the pipes, they expand and can cause them to knock or make noise. This is a common issue that can be resolved by installing a water hammer arrestor or adjusting the water pressure.

What could be wrong when there is no hot water but the hot water tank seems to be working?

air lock in hot water pipe

Why is the hot water pressure low in my system?

The hot water pressure in your system may be low due to various reasons such as a clogged pipe, a faulty water heater, or a problem with the pressure regulator. It is recommended to check these components to identify and fix the issue.

Replacing bathroom sink and found hot water pipe cold water pipe and mystery pipe What is it?

Vent, return circulation

Services:?

Plumbing Services, Cheap Plumber, Hot Water Heater Installation, Fix Leaking Water Heater, Leak Detection Service, Water Pipe Leak Repair, Emergency Drain Unblocking,

What cause banging noise in bathroom when hot water faucet?

This "knocking" sound probably means the pipe is hitting against something (like a wall). Possibly a clamp that holds tight the pipe is loose and the pressure is moving the pipe against something. It is possible to place a wooden wedge in the problem area so the pipe does not "bang" or "knock", or get a clamp.

Still have questions?

imp

Resources

Top Categories

Product

Company

Copyright ©2025 Infospace Holdings LLC, A System1 Company. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Answers.